JP2006238154A - Data processing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a data processing method capable of enhancing the secrecy of key data. <P>SOLUTION: Program data of a first part FA1 of a data processing program EP1 are set to temporary key data D1, program data of a second part SA1 are set to temporary processing object data D2, the key data D3 are generated by data-processing the temporary processing object data D2 by using the temporary key data D1 according to the data processing program EP1, and the processing object data are data-processed by using the key data D3 according to the data processing program EP1. Thus, even if the data processing program EP1 are unfairly acquired by a third person, the temporary key data D1 and the temporary processing object data D2 are specified in the data processing program EP1, the leakage of the key data D3 is almost surely prevented, and the secrecy of the key data D3 is improved. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a data processing method, and is suitable for application to, for example, a recording / reproducing system for recording / reproducing music data.

  In a conventional data providing system, a content provider encrypts content data with content key data, and encrypts the content key data with distribution key data. Then, the content provider sends a secure container storing these encrypted content data (hereinafter referred to as encrypted content data) and content key data (hereinafter referred to as encrypted content key data) to the user home network. Supply.

On the other hand, the network devices and A / V devices in the user home network use the distribution key data in the secure container by using a SAM (Secure Application Module), which is a tamper-resistant hardware module provided inside. Decrypt the encrypted content key data. Then, the network device and the A / V device send the content key data obtained by the SAM to the decryption / decompression module together with the encrypted content data, and the decryption / decompression module uses the content key data to decrypt the encrypted content data. After that, it was stretched (see, for example, Patent Document 1).
JP 2001-22271 (page 19, page 20, FIG. 10)

  By the way, the network device and the A / V device having such a configuration hold the distribution key data by a SAM having a hardware configuration that is difficult to illegally access from the outside. As a result, the network device and the A / V device prevent the distribution key data from leaking and prevent the content key data, encrypted content data, etc. from being used illegally using the distribution key data. is doing. However, with network devices and A / V devices, etc., with the recent increase in functionality, if all internal circuits have a hardware configuration, the circuit scale will increase significantly. For example, the circuit that executes the decoding process will have a software configuration. It has been proposed. In a network device, an A / V device, or the like, when the circuit for executing the decryption process has a software configuration, it is mounted with the key data embedded in the decryption program for executing the decryption process. It has also been proposed to extract key data and use it for decryption.

  However, when the key data is embedded in the decryption program as it is, for example, when such a decryption program is illegally obtained by a third party, due to the difference in the data structure between the program data constituting the decryption program and the key data, The key data can be easily specified in the decryption program. For this reason, in a network device, an A / V device, or the like, when the circuit for executing the decryption process has a software configuration, there is a problem that the confidentiality of the key data used for the decryption process is still extremely low.

  The present invention has been made in view of the above points, and intends to propose a data processing method capable of improving the confidentiality of key data.

  In order to solve this problem, according to the present invention, in a data processing method, program data of a first part of a data processing program is set as temporary key data, and program data of a second part of the data processing program is temporarily stored. A data setting step for setting the processing target data, a key data generation step for generating key data by processing the temporary processing target data using the temporary key data according to the data processing program, and a key according to the data processing program A data processing step for processing data to be processed using data is provided.

  Therefore, in the data processing method of the present invention, the program data itself of the first and second portions of the data processing program are set as temporary key data and temporary processing target data, respectively, and the temporary key data is used according to the data processing program. Since the temporary processing target data is processed to generate key data, even if the data processing program is illegally acquired by a third party, the temporary key data and the temporary processing target data are stored in the data processing program. It can be prevented almost certainly. As a result, in such a data processing method, it is possible to almost certainly prevent the key data from leaking even if the data processing program is illegally acquired.

  In the present invention, in the data reversible processing method, the program data of the first part of the data processing program is used as temporary key data, and the program data of the second part of the data processing program is used as temporary process target data. A data reversible processing step for performing reversible data processing on input data using key data generated by data processing of temporary processing target data using temporary key data according to a data processing program. I made it.

  Therefore, in the data reversible processing method according to the present invention, the program data itself of the first and second parts of the data processing program is used as temporary key data and temporary processing target data in the data processing circuit holding the data processing program. In order to execute the data reversible processing on the input data using the same key data as the key data generated by processing the temporary processing target data using the temporary key data according to the data processing program, the data processing circuit It is possible to avoid the key data being forwarded to the self. As a result, in this data reversible processing method, it is possible to almost certainly prevent the key data used in the data processing circuit from leaking due to the transfer.

  Further, in the present invention, in the data processing device, the first data setting means for setting the program data of the first part of the data processing program as temporary key data and the program data of the second part of the data processing program are stored. Second data setting means for setting temporary data to be processed, key data generating means for generating key data by processing the temporary data to be processed using temporary key data according to the data processing program, and data A data processing circuit having data processing means for processing data to be processed using key data in accordance with a processing program is provided.

  Therefore, in the data processing apparatus of the present invention, in the data processing circuit, the program data itself of the first and second portions of the data processing program are set as temporary key data and temporary processing target data, respectively, and the temporary processing is performed according to the data processing program. Since the key data is generated by processing the temporary processing target data using the key data, even if the data processing program is illegally acquired by a third party, the temporary key data and the temporary data are included in the data processing program. It is possible to almost certainly prevent the processing target data from being specified. As a result, such a data processing apparatus can almost certainly prevent the key data from leaking even if the data processing program is obtained improperly.

  Further, according to the present invention, in the data reversible processing apparatus, the program data of the first part of the data processing program is used as temporary key data, and the program data of the second part of the data processing program is used as temporary processing target data. Data reversible processing means for performing reversible data reversible on input data using key data generated by data processing of temporary processing target data using temporary key data according to a data processing program A data reversible processing circuit is provided.

  Therefore, in the data reversible processing apparatus according to the present invention, the program data itself of the first and second parts of the data processing program in the data processing circuit holding the data processing program is used as temporary key data and temporary processing target data, respectively. In order to execute the data reversible processing on the input data using the same key data as the key data generated by processing the temporary processing target data using the temporary key data according to the data processing program, the data processing circuit On the other hand, it is possible to avoid transferring the key data to the self-reversible data processing apparatus. As a result, such a data reversible processing apparatus can almost certainly prevent the key data used in the data processing circuit from leaking due to the transfer.

  Further, in the present invention, in the data processing circuit, the first data setting means for setting the program data of the first part of the data processing program as temporary key data and the program data of the second part of the data processing program are stored. Second data setting means for setting temporary data to be processed, key data generating means for generating key data by processing the temporary data to be processed using temporary key data in accordance with a data processing program, and data Data processing means for processing data to be processed using key data in accordance with a processing program is provided.

  Therefore, in the data processing circuit of the present invention, the program data itself of the first and second portions of the data processing program are set as temporary key data and temporary processing target data, respectively, and the temporary key data is used according to the data processing program. Since the temporary processing target data is processed to generate key data, even if the data processing program is illegally acquired by a third party, the temporary key data and the temporary processing target data are stored in the data processing program. It can be prevented almost certainly. As a result, such a data processing circuit can almost certainly prevent the key data from leaking even if the data processing program is illegally acquired.

  Furthermore, in the present invention, in the data reversible processing circuit, the program data of the first part of the data processing program is used as temporary key data, and the program data of the second part of the data processing program is used as temporary processing target data. Data reversible processing means for performing reversible data reversible on input data using key data generated by data processing of temporary processing target data using temporary key data according to a data processing program I made it.

  Therefore, in the data reversible processing circuit of the present invention, the program data itself of the first and second parts of the data processing program is the temporary key data and temporary processing target data in the data processing circuit holding the data processing program, respectively. In order to execute the data reversible processing on the input data using the same key data as the key data generated by data processing the temporary processing target data using the temporary key data according to the data processing program, the data processing program It is possible to avoid transferring the key data to the data reversible processing circuit of the data processing circuit that holds the data. As a result, in such a data reversible processing circuit, it is possible to almost certainly prevent the key data used in the data processing circuit from leaking due to transfer.

  Further, in the present invention, the data processing control program sets the program data of the first part of the data processing program as temporary key data for the data processing circuit, and the program data of the second part of the data processing program. A data setting step for setting data as temporary processing target data, a key data generation step for generating key data by processing the temporary processing target data using temporary key data according to the data processing program, and a data processing program And a data processing step for processing data to be processed using key data.

  Therefore, in the data processing control program of the present invention, the program data itself of the first and second parts of the data processing program is set as temporary key data and temporary processing target data to the data processing circuit, respectively. Temporary processing target data is processed using temporary key data to generate key data. Even if a data processing program is illegally acquired by a third party, the temporary key data within the data processing program And it can prevent almost certainly that temporary process target data are specified. As a result, such a data processing control program can almost certainly prevent the key data from leaking even if the data processing program is illegally acquired.

  Further, in the present invention, the program data of the first part of the data processing program is used as temporary key data for the data reversible processing circuit by the data reversible processing control program, and the program of the second part of the data processing program. Data that is reversible to the data processing using the key data generated by processing the temporary processing target data using the temporary key data according to the data processing program as the temporary processing target data The data reversible processing step for reversible processing is executed.

  Accordingly, in the data reversible processing control program of the present invention, the program data itself of the first and second parts of the data processing program is temporarily stored in the data reversible processing circuit by the data processing circuit holding the data processing program. Data and provisional processing target data, and data reversible processing is performed on the input data using the same key data as the key data generated by data processing the provisional processing target data using the provisional key data according to the data processing program. Since it is executed, it is possible to avoid transferring the key data to the data reversible processing circuit to the data processing circuit holding the data processing program. As a result, such a data reversible processing control program can almost certainly prevent the key data used in the data processing circuit from leaking due to the transfer.

  According to the present invention, the program data of the first part of the data processing program is set as temporary key data, the program data of the second part of the data processing program is set as temporary processing target data, and the data The key data is generated by data processing the temporary processing target data using the temporary key data according to the processing program, and the processing target data is processed using the key data according to the data processing program. Even if the data processing program is obtained by the three parties illegally, it is possible to almost certainly prevent the provisional key data and the provisional processing target data from being specified in the data processing program. Data processing that can almost certainly prevent data leakage and thus improve the confidentiality of key data Law, data processing apparatus, it is possible to realize the data processing circuit and a data processing control program.

  According to the invention, the program data of the first part of the data processing program is used as temporary key data, and the program data of the second part of the data processing program is used as temporary processing target data according to the data processing program. By using key data generated by data processing of temporary processing target data using temporary key data, the input data is subjected to data reversible processing that is reversible to the data processing, thereby enabling the data processing program to It is possible to prevent the key data used in the data processing circuit from being leaked due to the transfer, as a result, it is possible to avoid transferring the key data to the data processing circuit held by itself. Data reversible processing method, data reversible processing apparatus, and data reversible processing capable of improving the confidentiality of key data It is possible to realize the road and data lossless processing control program.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

(1) 1st Embodiment In FIG. 1, 1 shows the recording / reproducing system by 1st Embodiment as a whole, and the recording / reproducing apparatus 2 which a user uses communicates with the music provision server 3 via network NT. It is made to be able to do.

  In this case, as shown in FIG. 2, the recording / reproducing apparatus 2 is operated by the user by an operation input unit 10 including various operation buttons provided on the surface of the casing of the recording / reproducing apparatus 2 or a remote controller (not shown). Then, the operation input unit 10 recognizes this and sends an operation input signal corresponding to the operation to the input processing unit 11. The input processing unit 11 converts the operation input signal into an operation command by performing predetermined processing on the supplied operation input signal, and converts the operation command signal to a central processing unit (CPU) via the bus 12. ) 13.

  The central processing unit 13 reads various programs such as basic programs and application programs stored in advance in a ROM (Read Only Memory) 14 or a hard disk drive 15 into a RAM (Random Access Memory) 16 via the bus 12. The central processing unit 13 controls the whole in accordance with these various programs developed on the RAM 16, and executes predetermined arithmetic processing and various processing according to operation commands given from the input processing unit 11.

  Thereby, the central processing unit 13 can connect to the network NT via the communication processing unit 17 and the network interface 18 in order, and can access the music providing server 3 on the network NT. In this case, the music providing server 3 obtains by encrypting a large number of music data for music distribution using the same key data as the key data used for the decryption process in the recording / playback apparatus 2 after compression-encoding processing. Is stored as encrypted music data. Incidentally, music data for music distribution includes ATRAC3 (Adaptive Transform Acoustic Coding 3), AAC (Advanced Audio Coding), WMA (Windows (registered trademark) Media Audio), RealAudio G2 Music Codec, MP3 (MPEG Audio Layer-3), etc. The compression encoding method is used.

  Therefore, when an operation input signal for requesting distribution of desired music is input by the user via the operation input unit 10, the central processing unit 13 accesses the music providing server 3 and distributes the desired music accordingly. Request. As a result, the central processing unit 13 takes in the encrypted music data of the desired music distributed from the music providing server 3 via the network interface 18 and the communication processing unit 17 in order. Thus, the central processing unit 13 sends the encrypted music data to the hard disk drive 15 and records it on the hard disk.

  The central processing unit 13 receives the operation input signal for requesting reproduction of the designated encrypted music data and the designated music data in the hard disk drive 15 being designated by the user via the operation input unit 10. In response to this, the designated encrypted music data is read from the hard disk drive 15 and sent to the data processing circuit 19. The data processing circuit 19 decrypts the encrypted music data using the key data and generates compressed encoded music data. The data processing circuit 19 decompresses the compression-encoded music data and sends the obtained music data to the audio processing unit 20. The sound processing unit 20 performs sound processing such as digital-analog conversion and amplification on the music data given from the data processing circuit 19 and sends the obtained music signal to the speaker 21. As a result, the audio processing unit 20 can output music based on the music signal from the speaker 21 and allow the user to listen to the music.

  As shown in FIG. 3, the data processing circuit 19 is formed as a circuit board on which an IC (Integrated Circuit) chip that constitutes a tamper-resistant memory 30 and a DSP (Digital Signal Processor) 31 is mounted. Has been. In this case, the data processing circuit 19 stores a data processing control program for basic operation in the memory 30 in advance. The DSP 31 of the data processing circuit 19 executes the decoding process using the decoding program and the expansion process using the expansion program in accordance with the data processing control program in the memory 30, and at the time of actually decoding the processing target data. A key data generation process for generating key data to be used (hereinafter referred to as actual use key data) is also executed. However, in the configuration of the data processing circuit 19 shown in FIG. 3 described below, various functions of the DSP 31 (that is, various functions that can be executed according to the data processing control program, the decoding program, and the decompression program) are assumed to be functional blocks for convenience of explanation. (Ie, data setting unit 32, key data generation unit 33, codec processing unit 34).

  First, the manufacturer of the recording / reproducing apparatus 2 includes a firmware that summarizes a data decryption program for decrypting encrypted music data in the data processing circuit 19 and a decompression program for decompressing compression-encoded music data. Encryption firmware is generated by performing encryption processing using predetermined actual use key data in advance. The manufacturer stores such encrypted firmware in the ROM 14 or the hard disk drive 15 of the recording / reproducing apparatus 2. The central processing unit 13 reads the encrypted firmware from the ROM 14 or the hard disk drive 15 every time the recording / reproducing apparatus 2 is started up, transfers the read encrypted firmware to the data processing circuit 19 and temporarily stores it in the memory 30. To do.

  In this case, in addition to the data processing control program, the memory 30 of the data processing circuit 19 also stores in advance a decryption program for decrypting the encrypted firmware (hereinafter referred to as a firmware decryption program). . Therefore, as shown in FIG. 4, the data setting unit 32 that shows some functions of the DSP 31 as functional blocks reads the firmware decoding program EP1 from the memory 30 when the recording / reproducing apparatus 2 is activated, and sets initial settings that are set in advance. Based on the information, the first part FA1 consisting of one part selected in advance in the firmware decoding program EP1 is discriminated, and the second part consisting of one part partially overlapping with the first part FA1. The part SA1 is determined. Then, the data setting unit 32 sets the program data of the first portion FA1 in the entire program data forming the firmware decryption program EP1 as temporary key data D1 used for decryption processing that can be executed according to the firmware decryption program EP1. . In addition, the data setting unit 32 uses the program data of the second part SA1 in the entire program data forming the firmware decryption program EP1 as temporary processing target data D2 used for decryption processing that can be executed according to the firmware decryption program EP1. Set. In this way, the data setting unit 32 shows the temporary key data D1 and the temporary processing target data D2 set by using the firmware decryption program EP1, with the partial function of the DSP 31 as function blocks. To send.

  The key data generation unit 33 reads the firmware decryption program EP1 from the memory 30 when provisional key data D1 and provisional processing target data D2 are given from the data setting unit 32. Then, the key data generation unit 33 decrypts the temporary processing target data D2 using the temporary key data D1 in accordance with the firmware decryption program EP1. As a result, the key data generation unit 33 sends the processing result (that is, the operation result) obtained by the decryption process to the memory 30 as the actual use key data D3 actually used for the decryption process of the encrypted firmware. The actual use key data D3 is stored.

  As a result, the codec processing unit 34 showing the partial functions of the DSP 31 as function blocks, when the recording / reproducing apparatus 2 is activated, the encrypted firmware temporarily stored in the central processing unit 13 from the memory 30 and the key data generation unit 33. The actual use key data D3 generated by the above is read together with the firmware decryption program EP1. The codec processing unit 34 generates the decrypted firmware by decrypting the encrypted firmware using the actual use key data D3 in accordance with the firmware decryption program EP1, and sends the generated firmware to the memory 30. And remember. In this way, the codec processing unit 34 performs, as firmware, a decryption program EP2 for decrypting encrypted music data (hereinafter referred to as a data decryption program in particular) EP2 and a decompression process for compression-encoded music data. Can be obtained.

  Further, when the data decryption program EP2 is stored as the decrypted firmware in the memory 30, the data setting unit 32 reads the data decryption program EP2 from the memory 30, and based on the initial setting information, the data setting program 32 A first part FA2 consisting of one part selected in advance in the decryption program EP2 is discriminated, and a second part SA2 consisting of one part partially overlapping with the first part FA2 is discriminated. Then, the data setting unit 32 sets the program data of the first portion FA2 in the entire program data forming the data decryption program EP2 as temporary key data D4 used for decryption processing that can be executed according to the data decryption program EP2. . In addition, the data setting unit 32 sets the program data of the second part SA2 in the entire program data forming the data decoding program EP2 as temporary processing target data D5 used for the decoding process executable according to the data decoding program EP2. To do. In this way, the data setting unit 32 sends the temporary key data D4 and temporary processing target data D5 set using the data decryption program EP2 to the key data generation unit 33.

  The key data generation unit 33 reads the data decryption program EP2 from the memory 30 when provisional key data D4 and provisional processing target data D5 are given from the data setting unit 32. The key data generation unit 33 decrypts the temporary processing target data D5 using the temporary key data D4 according to the data decryption program EP2. Thus, the key data generation unit 33 sends the processing result (that is, the operation result) obtained by the decryption process to the memory 30 as the actual use key data D6 actually used for the decryption process of the encrypted music data, and thus the memory 30 stores the actual use key data D6.

  In this state, when the user requests the reproduction of the encrypted music data, the central processing unit 13 reads the encrypted music data from the hard disk drive 15, transfers it to the data processing circuit 19, and temporarily stores it in the memory 30. At this time, the codec processing unit 34 of the data processing circuit 19 reads the data decryption program EP2 and the actual use key data D6 used for the decryption processing of the encrypted music data from the memory 30, and also reads the decompression program and further temporarily stores it. Also read encrypted music data. Then, the codec processing unit 34 generates compression-encoded music data by decoding the encrypted music data using the actual use key data D6 in accordance with the data decoding program EP2. The codec processing unit 34 generates music data by expanding the compression-encoded music data according to the expansion program, and sends the generated music data to the audio processing unit 20.

  In this way, in the data processing circuit 19, since it is generally possible to use arbitrary data as the key data and the data to be processed for the decryption process, the firmware decryption program EP1 and the data decryption program are utilized using such advantages. The program data itself of the first and second portions FA1, FA2, SA1, and SA2 in EP2 are used as temporary key data D1 and D4 and temporary processing target data D2 and D5, respectively. The data processing circuit 19 decrypts the temporary processing target data D2 and D5 using the temporary key data D1 and D4, and generates actual use key data D3 and D6 as the processing results. For this reason, as shown in FIG. 5, in the data processing circuit 19, in other words, the actual use key data D3 and D6 are given to the firmware decryption program EP1 and the data decryption program EP2 as if they were actually used key data D3 and D6. Can be said to be embedded so as to be indistinguishable (that is, as temporary key data D1, D4 and temporary processing target data D2, D5).

  By the way, as a key data embedding method for embedding the key data in the decrypted data, as shown in FIG. 6A, the actual use key data D7 itself is impersonated by a predetermined processing method such as shuffling for the decryption program EP3. It is also conceivable to embed it as key disguise data D8 obtained by doing so. However, in this key data embedding method, the data size of the entire decryption program EP3 increases by the amount of the key disguise data D8 embedded therein. Also, in this key data embedding method, a disguise canceling program CCP1 for canceling the disguise of the key disguise data D8 and obtaining the actual use key data D7 is provided together with the decryption program EP3 in which the key disguise data D8 is embedded in the memory. It is necessary to remember. For this reason, in this key data embedding method, the capacity of the memory for storing the decryption program EP3 needs to be stored together with the decryption program EP3, so that the disguise cancellation program CCP1 is also greatly increased. On the other hand, as shown in FIG. 6B, in the data processing circuit 19 according to the present embodiment, the program data itself in the firmware decryption program EP1 and the data decryption program EP2 is converted into temporary key data D1, D4 and temporary processing. Since the target data D2 and D5 are used, and the temporary key data D1 and D4 and the temporary processing target data D2 and D5 are used to generate the actual use key data D3 and D6, the firmware decryption program EP1 and the data decryption program EP2 as a whole Can be prevented from increasing by the amount of the key disguise data D8. Further, the data processing circuit 19 does not disguise the actual use key data D3 and D6 itself, so that it is not necessary to store the disguise cancellation program CCP1 in the memory 30. Therefore, in the data processing circuit 19, it is possible to avoid an increase in the capacity of the memory 30 by the amount of the key disguise data D8 and the disguise cancellation program CCP1.

  In this key data embedding method, the key impersonation data D8 is different from the decryption program EP3 because the key impersonation data D8 is different from the decryption program EP3. It becomes possible. On the other hand, in the data processing circuit 19 according to the present embodiment, the program data itself in the firmware decryption program EP1 and the data decryption program EP2 is set as temporary key data D1, D4 and temporary processing target data D2, D5. These cannot be easily distinguished from the firmware decryption program EP1 and the data decryption program EP2, and as a result, the actual use key data D3 and D6 can be made difficult to leak. Therefore, in the present invention, instead of adopting such a key data embedding method, temporary key data D1, which is program data itself, is used as the actual key data D3 and D6 for the firmware decryption program EP1 and the data decryption program EP2. D4 and temporary processing target data D2 and D5 are embedded.

  In the case of the first embodiment, for example, the manufacturer of the recording / reproducing apparatus 2 temporarily stores the program data of the first and second portions FA1 and SA1 in the firmware decryption program EP1 as in the data processing circuit 19. Key data D1 and temporary processing target data D2 are set, and the actual processing key data D3 is generated by decrypting the temporary processing target data D2 using the temporary key data D1 according to the firmware decryption program EP1. Yes. When the manufacturer generates the actual use key data D3 as described above, the actual use key data D3 is generated in accordance with an encryption program for executing an encryption process reversible with the decryption process that can be executed according to the firmware decryption program EP1. The encrypted firmware is generated by encrypting the firmware using. The manufacturer stores the encrypted firmware in the ROM 14 or the hard disk drive 15 of the recording / reproducing apparatus 2 when the recording / reproducing apparatus 2 is manufactured. Therefore, the data processing circuit 19 decrypts the encrypted firmware transferred from the central processing unit 13 using the same actual use key data D3 as the actual use key data D3 used in the encryption process, and thus encrypts the encrypted firmware. You can get the firmware that was solved. In the present invention, as in the decryption process and the encryption process, one data process is performed on the processing target data, and the other data process is performed on the process result data obtained as a result. When the data to be processed can be obtained, the relationship between the one data processing and the other data processing is called a reversible relationship.

  In practice, the DSP 31 of the data processing circuit 19 performs the first data processing control processing procedure for decrypting the encrypted firmware and the decryption processing of the encrypted music data according to the data processing control program stored in the memory 30 in advance. The second data processing control processing procedure is executed. First, when the recording / reproducing apparatus 2 is activated, the DSP 31 starts the first data processing control processing procedure RT1 shown in FIG. 7 according to the data processing control program. When starting the first data processing control processing procedure RT1, the DSP 31 determines the first part FA1 in the firmware decoding program EP1 based on the initial setting information in step SP1, and determines the program of the determined first part FA1. Data is set to temporary key data D1. Further, the DSP 31 determines the second part SA1 in the firmware decryption program EP1, sets the program data of the determined second part SA1 in the temporary processing target data D2, and moves to the next step SP2.

  In step SP2, the DSP 31 generates the actual use key data D3 by decrypting the temporary processing target data D2 using the temporary key data D1 in accordance with the firmware decryption program EP1, and moves to the next step SP3. In step SP3, the DSP 31 stores the actual use key data D3 in the memory 30, and proceeds to the next step SP4. In step SP4, the DSP 31 generates the decrypted firmware by decrypting the encrypted firmware using the actual use key data D3 in accordance with the firmware decryption program EP1, and stores the decrypted firmware in the memory 30. Moving to step SP5, the first data processing control processing procedure RT1 is terminated. In this way, the DSP 31 executes the first data processing control processing procedure RT1 every time the recording / reproducing apparatus 2 is activated.

  When the DSP 31 decrypts the firmware and obtains the data decryption program EP2, the DSP 31 starts the second data processing control processing procedure RT2 shown in FIG. 8 according to the data processing control program. When starting the second data processing control processing procedure RT2, the DSP 31 determines the first part FA2 in the data decoding program EP2 based on the initial setting information in step SP11, and determines the program of the determined first part FA2. Data is set to temporary key data D4. Further, the DSP 31 determines the second part SA2 in the data decoding program EP2, sets the determined program data of the second part SA2 in the temporary processing target data D5, and moves to the next step SP12.

  In step SP12, the DSP 31 generates the actual use key data D6 by decrypting the temporary processing target data D5 using the temporary key data D4 in accordance with the data decryption program EP2, and proceeds to the next step SP13. In step SP13, the DSP 31 stores the actual use key data D6 in the memory 30, and proceeds to the next step SP14. In step SP14, the DSP 31 determines whether or not to execute data processing on the encrypted music data. If a positive result is obtained in step SP14, this indicates that the user has requested reproduction of the encrypted music data. In other words, the affirmative result is that a processing start request for requesting the DSP 31 to start execution of data processing on the encrypted music data is given from the central processing unit 13 to the memory 30 of the data processing circuit 19 from the central processing unit 13. This indicates that the transferred encrypted music data to be processed is temporarily stored. Therefore, the DSP 31 proceeds to the next step SP15 at this time.

  In step SP15, the DSP 31 generates compressed encoded music data by decrypting the encrypted music data using the actual use key data D6 according to the data decryption program EP2, and generates the compressed encoded music data according to the decompression program. Music data is generated by performing the decompression process, and the music data is sent to the audio processing unit 20, and the process proceeds to the next step SP16. In step SP16, the DSP 31 determines whether to stop the data processing circuit 19 from starting. As a result, when the DSP 31 obtains a negative result in order to keep the data processing circuit 19 in operation while the recording / reproducing apparatus 2 is in operation, the DSP 31 returns to step SP14. By the way, if a negative result is obtained in the above-described step SP14, this indicates that the user has not yet requested reproduction of the encrypted music data. Accordingly, the DSP 31 proceeds to step SP16 at this time. For this reason, the DSP 31 thereafter repeats the processing from step SP14 to step SP16 cyclically every time reproduction of the encrypted music data is requested until a positive result is obtained in step SP16. Play the data. When the DSP 31 obtains an affirmative result by stopping the data processing circuit 19 in response to the start / stop of the recording / reproducing apparatus 2 in step SP16, the DSP 31 proceeds to the next step SP17 and performs the second data processing control process. The procedure RT2 is terminated. In this way, the DSP 31 executes the second data processing control processing procedure RT2 every time the recording / reproducing apparatus 2 is activated.

  Next, the circuit configuration of the music providing server 3 will be described with reference to FIG. In the music providing server 3, the internal central processing unit 40 reads various programs such as basic programs and application programs stored in advance in the ROM 41 or the hard disk drive 42 to the RAM 44 via the bus 43. The central processing unit 40 controls the whole in accordance with these various programs developed on the RAM 44 and executes various processes such as predetermined arithmetic processing. Thus, when a large number of music data for music distribution is supplied from the outside by communication via the network NT or transport of a recording medium on which the music data is recorded, the central processing unit 40 converts the music data into the data processing circuit 45. To send.

  In this case, the data processing circuit 45 is formed as a circuit board on which IC chips that respectively constitute a tamper-resistant memory 46 and a DSP-configured codec processing unit 47 are mounted. The data processing circuit 45 having the circuit board configuration is manufactured, for example, by the manufacturer of the recording / reproducing apparatus 2. When the data processing circuit 45 is manufactured, the manufacturer of the recording / reproducing apparatus 2 program data of the first and second parts FA2 and SA2 in the data decoding program EP2 in the same manner as the data processing circuit 19 of the recording / reproducing apparatus 2. Is set as temporary key data D4 and temporary processing target data D5, and actual processing key data D6 is generated by decrypting temporary processing target data D5 using temporary key data D4 according to the data decryption program EP2. is doing. The manufacturer stores the actual use key data D6 in the memory 46 of the data processing circuit 45. The manufacturer also performs encryption on the memory 46 of the data processing circuit 45 to execute encryption processing that is reversible with the decryption processing that can be executed by the data processing circuit 19 of the recording / reproducing apparatus 2 according to the data decryption program. (Hereinafter referred to as a data encryption program). Further, the manufacturer compresses the memory 46 of the data processing circuit 45 to execute a compression encoding process that has a reversible relationship with the decompression process that can be executed in accordance with the decompression program by the data processing circuit 19 of the recording / reproducing apparatus 2. An encoding program is also stored. Furthermore, the manufacturer performs encryption processing and compression coding processing on the memory 46 of the data processing circuit 45, which has a reversible relationship with the decryption processing and decompression processing that can be executed by the data processing circuit 19 of the recording / reproducing apparatus 2. A data reversible processing control program for controlling the data is also stored. Then, the manufacturer provides the data processing circuit 45 having such a circuit board configuration to the operating company of the music providing server 3 and incorporates it in the music providing server 3.

  Therefore, in the data processing circuit 45, when the music data for music distribution is given from the central processing unit 40, the codec processing unit 47 reads the compression encoding program, the data encryption program, and the actual use key data D6 from the memory 46. Then, the codec processing unit 47 generates compression-encoded music data by performing compression-encoding processing on the music data according to the compression-encoding program. The codec processing unit 47 generates encrypted music data by encrypting the compression-encoded music data using the actual use key data D6 according to the data encryption program. When the codec processing unit 47 generates the encrypted music data in this way, the generated encrypted music data is sent to the hard disk drive 42 via the central processing unit 40 and stored in the hard disk.

  When the distribution request signal is transmitted from the recording / reproducing apparatus 2 via the network NT in response to a distribution request for a desired music piece by the user, the central processing unit 40 sends the distribution request signal to the network interface 48 and the communication processing unit 49. Capture through sequentially. Thus, the central processing unit 40 selectively reads out the encrypted music data corresponding to the music requested to be distributed by the user from the hard disk drive 42 in response to the distribution request signal, and performs communication processing on the read encrypted music data. The data is transmitted to the recording / reproducing apparatus 2 via the network NT via the unit 49 and the network interface 48 in order. In this way, the central processing unit 40 can distribute the encrypted music data to the recording / reproducing apparatus 2. The central processing unit 40 generates the encrypted music data by using the same actual use key data D6 as the actual use key data D6 used for the decryption process in the data processing circuit 19 of the recording / reproducing apparatus 2. The recording / playback apparatus 2 can accurately decrypt the encrypted music data.

  In practice, when the music providing server 3 is activated, the codec processing unit 47 of the data processing circuit 45 starts the first data reversible processing control processing procedure RT3 shown in FIG. To do. When starting the first data reversible processing control processing procedure RT3, the codec processing unit 47 determines whether or not to perform data processing on music data in step SP21. If a negative result is obtained in step SP21, this indicates that, for example, the management company of the music providing server 3 is not requested to store new music data for distribution. Accordingly, the codec processing unit 47 waits for a request to start execution of data processing on new music data by periodically repeating the determination processing in step SP21 at this time. On the other hand, if a positive result is obtained in step SP21, this indicates that, for example, the management company of the music providing server 3 has requested to store new music data for distribution. That is, this affirmative result indicates that a processing start request for requesting the codec processing unit 47 to start execution of data processing on the music data is given from the central processing unit 40 together with the new music data to be processed. . Accordingly, the codec processing unit 47 moves to the next step SP22 at this time.

  In step SP22, the codec processing unit 47 performs compression encoding processing of new music data according to the compression encoding program to generate compression encoded music data. The codec processing unit 47 generates encrypted music data by performing encryption processing on the compression-encoded music data using the actual use key data D6 in accordance with the data encryption program. The codec processing unit 47 sends the encrypted music data to the hard disk drive 42 via the central processing unit 40 and stores it in the hard disk, and then returns to step SP21. In this way, each time the codec processing unit 47 is requested to process and store new music data for music distribution, the processing of step SP21 and step SP22 is repeated cyclically. Thus, encrypted music data that can be newly distributed is generated.

  In the above configuration, when the recording / reproducing apparatus 2 is activated, the DSP 31 of the data processing circuit 19 performs the first part in the firmware decoding program EP1 based on the initial setting information in accordance with the data processing control program stored in the memory 30 in advance. The program data of FA1 is set as temporary key data D1, and the program data of the second portion SA1 in the firmware decryption program EP1 is set as temporary processing target data D2 (step SP1). Then, the DSP 31 generates the actual use key data D3 by decrypting the temporary processing target data D2 using the temporary key data D1 in accordance with the firmware decryption program EP1, and the generated actual use key data D3 is stored in the memory 30. Store (step SP2 and step SP3). In this state, the DSP 31 generates decrypted firmware by decrypting the encrypted firmware given from the central processing unit 13 using the actual use key data D3 in accordance with the firmware decryption program EP1, and stores the decrypted firmware in the memory. 30 (step SP4).

  Further, when the DSP 31 decrypts the firmware and obtains the data decryption program EP2, the program data of the first part FA2 in the data decryption program EP2 is provisional key data based on the initial setting information according to the data processing control program. In addition to setting to D4, the program data of the second portion SA2 in the data decoding program EP2 is set to temporary processing target data D5 (step SP11). Then, the DSP 31 generates the actual use key data D6 by decrypting the provisional processing target data D5 using the provisional key data D4 according to the data decryption program EP2, and the generated actual use key data D6 is stored in the memory 30. Store (step SP12 and step SP13). In this state, when the DSP 31 is requested to reproduce the encrypted music data, the DSP 31 decrypts the encrypted music data to be processed transferred from the central processing unit 13 using the actual use key data D6 in accordance with the data decryption program EP2. Thus, the compression-encoded music data is generated, and the compression-encoded music data is expanded according to the expansion program to generate the music data (step SP15).

  Therefore, in the recording / reproducing apparatus 2, the program data itself in the firmware decryption program EP1 and the data decryption program EP2 are used as temporary key data D1, D4 and temporary processing target data D2 used to generate the actual use key data D3 and D6. Therefore, even if the firmware decryption program EP1 and the data decryption program EP2 are illegally obtained by a third party, the temporary key data D1, D4 and the provisional processing target data D2, D5 are obtained by the third party. Can be almost certainly prevented. In the recording / reproducing apparatus 2, since the original data for generating the actual use key data D3 and D6 is two types of data, temporary key data D1 and D4 and temporary processing target data D2 and D5, On the other hand, the analysis process for the firmware decryption program EP1 and the data decryption program EP2 for specifying the temporary key data D1 and D4 and the provisional processing target data D2 and D5 can be complicated. Therefore, in the recording / reproducing apparatus 2, even if the firmware decryption program EP1 and the data decryption program EP2 are illegally obtained by a third party, the temporary key data D1, D4 and the provisional processing target data D2, D5 are obtained by the third party. Identification can be prevented more reliably. Further, the recording / reproducing apparatus 2 makes it difficult to easily specify the temporary key data D1 and D4 and the temporary processing target data D2 and D5 as described above, and in the firmware decryption program EP1 and the data decryption program EP2. Since the actual use key data D3 and D6 are not embedded, it is possible to almost certainly prevent the actual use key data D3 and D6 from leaking to a third party.

  On the other hand, when the music providing server 3 is requested to store new music data for distribution, the codec processing unit 47 in the data processing circuit 45 performs compression encoding processing on the new music data in accordance with the compression encoding program. Thus, the compressed encoded music data is generated, and the encoded music data is encrypted by encrypting the compressed encoded music data using the actual use key data D6 in the memory 46 in accordance with the data encryption program. Generate (step SP22).

  Accordingly, the music providing server 3 does not hold the data decryption program EP2 used for the decryption process in the recording / playback apparatus 2, and thus the recording / playback can be performed even if the actual use key data D6 cannot be generated by itself. Since the actual use key data D6 that is the same as the actual use key data D6 used for the decryption process of the encrypted music data in the apparatus 2 is held in advance and the music data is encrypted using the actual use key data D6, the recording is performed. It is possible to generate encrypted music data that can be decrypted by the playback device 2 without failure. Since the music providing server 3 holds the actual use key data D6 in advance as described above, it is possible to prevent the actual use key data D6 from being transferred from the recording / reproducing apparatus 2 to the self. As a result, the music providing server 3 can prevent the actual use key data D6 from leaking due to the transfer addressed to itself.

  According to the above configuration, in the recording / reproducing apparatus 2, the DSP 31 of the data processing circuit 19 sets the program data of the first portion FA1 in the firmware decryption program EP1 to the temporary key data D1 based on the initial setting information. At the same time, the program data of the second part SA1 in the firmware decryption program EP1 is set as temporary process target data D2, and the temporary process target data D2 is decrypted using the temporary key data D1 in accordance with the firmware decryption program EP1. By processing, the actual use key data D3 is generated and stored, and in this state, the encrypted firmware is decrypted using the actual use key data D3 in accordance with the firmware decryption program EP1. Therefore, in the recording / reproducing apparatus 2, the program data itself of the first and second portions FA1 and SA1 in the firmware decryption program EP1 are set as temporary key data D1 and temporary processing target data D2, respectively. Even if the firmware decryption program EP1 is illegally acquired by a third party in order to generate the actual use key data D3 by decrypting the temporary processing target data D2 using the temporary key data D1 according to the program EP1, It is possible to almost certainly prevent the provisional key data D1 and the provisional processing target data D2 from being specified in the firmware decryption program EP1. As a result, the recording / reproducing apparatus 2 can almost certainly prevent the actual use key data D3 from leaking even if the firmware decryption program EP1 is illegally obtained by a third party, and thus the actual use key data. The confidentiality of D3 can be improved.

  In the recording / reproducing apparatus 2, the DSP 31 of the data processing circuit 19 sets the program data of the first part FA2 in the data decryption program EP2 to the temporary key data D4 based on the initial setting information, and also the data decryption program EP2 The program data of the second part SA2 is set in the temporary processing target data D5, and the temporary processing target data D5 is decrypted by using the temporary key data D4 in accordance with the data decryption program EP2. Data D6 is generated and stored, and in this state, the encrypted music data to be processed is decrypted using the actual key data D6 according to the data decryption program EP2. Accordingly, in the recording / reproducing apparatus 2, the program data itself of the first and second portions FA2 and SA2 in the data decryption program EP2 are respectively stored in the same manner as when the actual use key data D3 is generated using the firmware decryption program EP1. In order to set the temporary key data D4 and the temporary processing target data D5 and decrypt the temporary processing target data D5 using the temporary key data D4 according to the data decryption program EP2 to generate the actual use key data D6. Even when the data decryption program EP2 is illegally acquired by a third party, it is almost certainly possible to prevent the provisional key data D4 and the provisional processing target data D5 from being specified in the data decryption program EP2. it can. As a result, the recording / reproducing apparatus 2 can almost certainly prevent the actual use key data D6 from leaking even if the data decryption program EP2 is illegally acquired by a third party, and thus the actual use key data D6. It is possible to improve secrecy.

  Further, in the music providing server 3, the codec processing section 47 of the data processing circuit 45 uses the temporary reproduction of the key data D4 and the program data itself of the first and second portions FA2 and SA2 in the data decryption program EP2 in the recording / playback apparatus 2. Temporary process target data D5 is used, and the same actual use key data D6 as the actual use key data D6 generated by decrypting the temporary process target data D5 using the temporary key data D4 according to the data decryption program EP2 is used. Thus, the compression-encoded music data is encrypted. Accordingly, the music providing server 3 can avoid causing the recording / reproducing apparatus 2 to transfer the actual use key data D6 to the recording / playback apparatus 2 itself. As a result, the music providing server 3 can almost certainly prevent the actual use key data D6 used in the recording / reproducing apparatus 2 from leaking due to transfer, and thus improve the confidentiality of the actual use key data D6. Can do.

  In addition to this, the recording / reproducing apparatus 2 generates actual use key data D3 and D6 in combination with the firmware decryption program EP1 and the data decryption program EP2 for executing decryption processing on the encrypted firmware and the encrypted music data. . Therefore, in the recording / reproducing apparatus 2, it is not necessary to store a dedicated program for generating the actual use key data D3 and D6 in the memory 30 of the data processing circuit 19, and thus the capacity of the memory 30 increases. You can avoid that. Further, in the recording / reproducing apparatus 2, the program data itself in the firmware decryption program EP1 and the data decryption program EP2 are set as temporary key data D1, D4 and temporary processing target data D2, D5, and the temporary key data D1, Since the actual use key data D3 and D6 are generated using D4 and the provisional processing target data D2 and D5, the firmware decryption program is stored in the memory 30 when compared with the key data embedding method described above with reference to FIG. Along with EP1 and the data decryption program EP2, it is possible to avoid storing the disguise actual use key data D3 and D6 and the disguise cancellation program CCP1 for canceling the disguise. As a result, the recording / reproducing apparatus 2 can avoid an increase in the capacity of the memory 30 by the amount of the actually used key data D3 and D6 and the disguise cancellation program CCP1.

  Further, in the recording / reproducing apparatus 2, the first and second portions FA1, FA2, and SA1 set in the temporary key data D1, D4 and the temporary processing target data D2, D5 in the firmware decryption program EP1 and the data decryption program EP2. Since SA2 is partially overlapped, for example, even if the temporary key data D1, D4 and the temporary processing target data D2, D5 have a relatively long data length, they are stored in the firmware decryption program EP1 and the data decryption program EP2. It can be reliably set as program data.

  Furthermore, in the recording / reproducing system 1 according to the first embodiment, since the data processing circuit 45 having the circuit board configuration manufactured by the manufacturer of the recording / reproducing apparatus 2 is incorporated in the music providing server 3, the existing music providing server However, it is possible to easily cause the recording / reproducing apparatus 2 to function as a server capable of distributing music data simply by incorporating the data processing circuit 45 having such a circuit board configuration.

  In the first embodiment described above, in the data processing circuit 19 of the recording / reproducing apparatus 2, the first and second parts FA1, FA2 and the second part partially overlapping in the firmware decoding program EP1 and the data decoding program EP2 and Although the case where the program data of SA1 and SA2 are set to temporary key data D1 and D4 and temporary processing target data D2 and D5 has been described, the present invention is not limited to this, and FIG. As shown, in the data processing circuit 19 of the recording / reproducing apparatus 2, the program data of the first and second parts FA3 and SA3, which are each one part that does not overlap in the firmware decoding program EP1 and the data decoding program EP2, are temporarily stored. You may make it set to the key data D10 and temporary process target data D11. Further, as shown in FIG. 11B, in the data processing circuit 19 of the recording / reproducing apparatus 2, the program data of the first part FA4 composed of a plurality of parts in the firmware decryption program EP1 and the data decryption program EP2 are connected and temporarily Key data D12, and the program data of the second part SA4 consisting of a plurality of parts in the firmware decryption program EP1 and the data decryption program EP2 are connected and set in the temporary processing target data D13. good. Even if it does in this way, the same effect as a 1st embodiment mentioned above can be acquired. In particular, in the recording / reproducing apparatus 2, when the first and second portions FA4 and SA4 are each formed of a plurality of portions as shown in FIG. 11B, the firmware decoding program EP1 and the data decoding program EP2 are the third ones. When it is illegally acquired by a person, it is possible to further make it difficult to specify the temporary key data D12 and the temporary processing target data D13 together with the first and second portions FA4 and SA4 each having a plurality of portions.

  In the first embodiment described above, in the data processing circuit 19 of the recording / reproducing apparatus 2, the first and second portions FA1, FA2, SA1, and SA2 in the firmware decoding program EP1 and the data decoding program EP2 are stored. Although the case where the program data is set to the temporary key data D1 and D4 and the temporary processing target data D2 and D5 has been described, the present invention is not limited to this, and in the data processing circuit 19 of the recording / reproducing apparatus 2, An encryption program is prepared for encryption processing by a predetermined encryption processing method applied to, for example, a portable recording / reproducing apparatus, which is different from the encryption processing method used when the music providing server 3 generates encrypted music data. In addition, the program data of the first and second parts in the encryption program are converted into temporary key data and temporary processing target data. Set data, the temporary processing target data by using the temporary key data may be generated actual use key data by encrypting in accordance with the encrypted program. In this manner, the recording / reproducing apparatus 2 once decrypts the encrypted music data acquired from the music providing server 3 to generate compression-encoded music data, and then uses the actual use key data according to the encryption program. By encrypting the compression-encoded music data and generating the encrypted music data again, the encrypted music data is transferred to an external portable recording / reproducing device and encrypted by the portable recording / reproducing device. Music data can be played to listen to music.

  Further, in the above-described first embodiment, the case where the data processing circuit 19 generates the actual use key data D3 and D6 every time the recording / reproducing apparatus 2 is activated has been described. However, the data processing circuit 19 generates the actual use key data D3 and D6 only when the recording / reproducing apparatus 2 is activated for the first time, and stores them in the memory 30 so that 2 of the recording / reproducing apparatus 2 is stored. The actual use key data D3 and D6 may not be generated at the time of starting after the first time. In this way, it is possible to significantly reduce the processing load on the data processing circuit 19 when the recording / reproducing apparatus 2 is activated.

(2) Second Embodiment In FIG. 12, in which the same reference numerals are assigned to the parts corresponding to those in FIG. As shown in FIG. 13, the central processing unit 62 and the data processing circuit 63 of the recording / reproducing apparatus 61 have different configurations from the central processing unit 13 and the data processing circuit 19 of the recording / reproducing apparatus 2 according to the first embodiment. is doing. Further, in the recording / reproducing system 60, as shown in FIG. 14 in which the same reference numerals are given to corresponding parts to FIG. 9, the central processing unit 66 and the data processing circuit 67 of the music providing server 65 provide the music according to the first embodiment. The central processing unit 40 and the data processing circuit 45 of the server 3 have different configurations.

  In such a recording / reproducing system 60, the manufacturer of the recording / reproducing device 61 uses the actual key data used when the firmware of the data processing circuit 63 is encrypted (that is, when the recording / reproducing device 61 decrypts the encrypted firmware). A plurality of the same key data as the actual use key data used in the above are prepared in advance. For example, the manufacturer periodically exchanges the actual use key data used for the encryption process of the firmware in order to improve its safety, and every time the actual use key data is exchanged, the manufacturer replaces the firmware with a new one. Encryption processing is performed using the actual use key data, and the obtained encrypted firmware is supplied to the recording / reproducing apparatus 61 together with key identification information that can identify the actual use key data used for the encryption processing. On the other hand, the music providing server 65 also uses the actual use key data used for the encryption processing of the distributable music data (that is, the same as the actual use key data used when the recording / playback apparatus 61 decrypts the encrypted music data). Is held multiple times. Then, the music providing server 65 periodically exchanges the actual use key data used for the music data encryption process in order to improve the safety, and encrypts the music data to generate the encrypted music data. In some cases, the encrypted music data is distributed to the recording / reproducing apparatus 61 together with the key identification information of the actual use key data used for the encryption process.

  In this case, as shown in FIG. 13, the central processing unit 62 of the recording / reproducing apparatus 61 takes in the encrypted firmware and key identification information supplied from the manufacturer of the recording / reproducing apparatus 61 via the recording medium or the network NT. Then, the fetched encrypted firmware and key identification information are sent to the hard disk drive 15, for example, and stored in the hard disk. In this way, the central processing unit 62 updates the encrypted firmware and the corresponding key identification information each time the encrypted firmware and the corresponding key identification information are given from the manufacturer. The central processing unit 62 reads the latest encrypted firmware and the corresponding key identification information stored at that time from the hard disk drive 15 every time the recording / reproducing apparatus 61 is activated, and both of them read the data processing circuit 63. To send. Further, when the user requests distribution of the desired music, the central processing unit 62 sends the encrypted music data and the key identification information distributed from the music providing server 65 to the network interface 18 and the communication processing unit 17 in response to the request. The encrypted music data and key identification information are sent to the hard disk drive 15 and recorded on the hard disk. When the user requests the reproduction of the desired encrypted music data, the central processing unit 62 reads out the encrypted music data together with the corresponding key identification information from the hard disk drive 15 in response to this, and sends it to the data processing circuit 63. Send it out.

  Here, in FIG. 15 in which the same reference numerals are assigned to corresponding parts to FIG. 3, the data processing circuit 63 differs from the first embodiment in a partial function corresponding to the data setting unit 71 of the DSP 70. As shown in FIG. 16, the data setting unit 71 receives the encrypted firmware and the corresponding key identification information from the central processing unit 62 every time the recording / reproducing apparatus 61 is activated. A first part FA10 consisting of one part selected in advance in the program EP1 is discriminated. Then, the data setting unit 71 sets the program data of the first portion FA10 in one temporary key data D15 among the entire program data forming the firmware decryption program EP1.

  Further, the data setting unit 71 determines a second part SA10 that is a part that partially overlaps the first part FA10 in the firmware decryption program EP1 based on the initial setting information. In this case, as shown in FIG. 17, for the firmware decryption program EP1, the second portion SA10 uses a plurality of locations used for setting a plurality of types of temporary processing target data D16 (hereinafter referred to as data setting usage locations). For example, the data size is selected so as to partially overlap SA101 to SA103. The initial setting information includes position information that can identify each of the plurality of data setting use locations SA101 to SA103 in the second portion SA10. Further, in the initial setting information, the program data of each data setting use location SA101, SA102, or SA103 is stored in the temporary processing target data D16 with respect to the location information of the plurality of data setting use locations SA101 to SA103 in the second portion SA10. Are associated with the key identification information of the actual use key data D17 generated when used as. Accordingly, when the data setting unit 71 (FIG. 16) determines the second part SA10 in the firmware decryption program EP1, the corresponding position information in the initial setting information is based on the key identification information given from the central processing unit 62 at this time. And corresponding one data setting use location SA101, SA102 or SA103 in the second portion SA10 is determined according to the selected position information. Then, the data setting unit 71 sets the program data of one data setting use location SA101, SA102 or SA103 determined in the second portion SA10 out of the entire program data forming the firmware decryption program EP1 as temporary processing target data D16. Set to. In this way, the data setting unit 71 sends the temporary key data D15 and temporary processing target data D16 set by using the firmware decryption program EP1 to the key data generation unit 33.

  As a result, the key data generation unit 33 uses the temporary key data D15 and temporary processing target data D16 given from the data setting unit 71 to perform decryption processing in the same manner as in the first embodiment described above. The actual use key data D17 used for the decryption process of the encrypted firmware is generated, and the generated actual use key data D17 is stored in the memory 30. Then, the codec processing unit 34 uses the actual use key data D17 to store the encrypted firmware that is transferred from the central processing unit 62 and temporarily stored in the memory 30 at this time, as in the case of the first embodiment described above. By performing the decryption process, the decrypted firmware is generated.

  The data setting unit 71 performs data decryption based on the initial setting information every time the central processing unit 62 provides corresponding key identification information together with the encrypted music data in response to a reproduction request of the encrypted music data by the user. A first part FA11 consisting of one part selected in advance in the program EP2 is discriminated. Then, the data setting unit 71 sets the program data of the first part FA11 in one temporary key data D18 among the entire program data forming the data decryption program EP2.

  In this case, for the data decryption program EP2, as in the case of the firmware decryption program EP1, the second part SA11 has a plurality of data setting use locations SA111 to SA113 corresponding to a plurality of types of temporary processing target data D19. For example, the data size is selected so as to partially overlap one another. The initial setting information includes position information that can identify each of the plurality of data setting use locations SA111 to SA113 in the second portion SA11. Further, in the initial setting information, the program data of each data setting / use location SA111, SA112 or SA113 is provisionally processed data D19 with respect to the position information of the plurality of data setting / use locations SA111 to SA113 in the second portion SA11. Are associated with the key identification information of the actual use key data D20 generated when used as a key.

  Therefore, the data setting unit 71 determines the second part SA11 that is a part that partially overlaps the first part FA11 in the data decoding program EP2 based on the initial setting information. In addition, the data setting unit 71 selects corresponding position information in the initial setting information based on the key identification information given from the central processing unit 62 at this time, and the second part according to the selected position information. One corresponding data setting use location SA111, SA112 or SA113 in SA11 is determined. Then, the data setting unit 71 sets the program data of one data setting use location SA111, SA112 or SA113 determined in the second portion SA11 out of the entire program data forming the data decryption program EP2 as temporary processing target data D19. Set. In this way, the data setting unit 71 sends the temporary key data D18 and temporary processing target data D19 set using the data decryption program EP2 to the key data generation unit 33.

  As a result, the key data generation unit 33 uses the temporary key data D18 and the temporary processing target data D19 given from the data setting unit 71 to perform decryption processing in the same manner as in the first embodiment described above. Then, the actual use key data D20 used for the decryption process of the encrypted music data is generated, and the generated actual use key data D20 is stored in the memory 30. The codec processing unit 34 uses the actual use key data D20 to store the encrypted music data transferred from the central processing unit 62 at this time and temporarily stored in the memory 30 in the case of the first embodiment described above. Similarly, compression-coded music data is generated by performing decoding processing.

  In the data processing circuit 63, the firmware decryption program EP1 and the data decryption program EP2 are decrypted by embedding a plurality of actual use key data as shown in FIG. 18 and embedding them as key disguise data D21 to D23. Compared with EP5, it is possible to avoid an increase in the capacity of the memory 30 because it is not necessary to embed the actual use key data D17 and D20 in the firmware decryption program EP1 and the data decryption program EP2, respectively. Further, in the key data embedding method for embedding the key disguise data D21 to D23 in the decryption program EP5, the disguise cancellation program CCP2 is also required. On the other hand, since the data processing circuit 63 does not require the disguise cancellation program CCP2 at all, it can be avoided that the capacity of the memory 30 is further increased by the disguise cancellation program CCP2. In the key data embedding method, the key impersonation data D21 to D23 in the decryption program EP5 are different from each other and have no meaning as the decryption program EP5. Therefore, the key impersonation data D21 to D23 in the decryption program EP5. Can be easily distinguished. On the other hand, in the data processing circuit 63, the program data itself in the firmware decryption program EP1 and the data decryption program EP2 is set as temporary key data D15 and D18 and temporary processing target data D16 and D19. It is possible to make it difficult to distinguish from the EP1 and the data decryption program EP2, and as a result, it is possible to make the actual use key data D17 and D20 difficult to leak easily.

  In practice, the DSP 70 of the data processing circuit 63 receives the above-described third data processing control processing procedure when decrypting the encrypted firmware according to the data processing control program stored in advance in the memory 30, and the encrypted music data. A fourth data processing control processing procedure at the time of decoding processing is executed. First, when the recording / reproducing apparatus 2 is activated, the DSP 70 starts the third data processing control processing procedure RT4 shown in FIG. 19 according to the data processing control program. When starting the third data processing control processing procedure RT4, the DSP 70 determines the first part FA10 in the firmware decoding program EP1 based on the initial setting information in step SP31, and determines the program of the determined first part FA10. Data is set to temporary key data D15. Further, the DSP 70 determines the second part SA10 in the firmware decryption program EP1 based on the initial setting information and the key identification information given from the central processing unit 62 at this time, and also in the second part SA10. One data setting use location SA101, SA102 or SA103 corresponding to the key identification information is determined. Then, the DSP 70 sets the program data of one data setting / use location SA101, SA102 or SA103 determined in the second part SA10 to the temporary processing target data D16, and proceeds to the next step SP32.

  In step SP32, the DSP 70 generates the actual use key data D17 by decrypting the temporary processing target data D16 using the temporary key data D15 in accordance with the firmware decryption program EP1, and proceeds to the next step SP33. In step SP33, the DSP 70 stores the actual use key data D17 in the memory 30, and proceeds to the next step SP34. In step SP34, the DSP 70 generates the decrypted firmware by decrypting the encrypted firmware using the actual use key data D17 in accordance with the firmware decryption program EP1, and stores the decrypted firmware in the memory 30. The process proceeds to step SP35 to end the third data processing control processing procedure RT4. In this way, the DSP 70 executes the third data processing control processing procedure RT4 every time the recording / reproducing apparatus 61 is activated.

  When the recording / reproducing apparatus 61 is activated and the firmware is decrypted to obtain the data decryption program EP2, the DSP 70 starts the fourth data processing control processing procedure RT5 shown in FIG. 20 according to the data processing control program. When starting the fourth data processing control processing procedure RT5, the DSP 70 determines whether or not to execute data processing on the encrypted music data in step SP41. If a positive result is obtained in step SP41, this indicates that the user has requested reproduction of the encrypted music data. In other words, the affirmative result is that a processing start request is issued from the central processing unit 62 to the DSP 70 to start execution of data processing on the encrypted music data, and the memory 30 of the data processing circuit 63 is sent to the memory 30 from the central processing unit 62. This indicates that the transferred encrypted music data to be processed is temporarily stored. Therefore, the DSP 70 proceeds to the next step SP42 at this time.

  In step SP42, the DSP 70 determines the first part FA11 in the data decryption program EP2 based on the initial setting information, and sets the determined program data of the first part FA11 in the temporary key data D18. Further, the DSP 70 determines the second part SA11 in the data decryption program EP2 based on the initial setting information and the key identification information given from the central processing unit 62 at this time, and also in the second part SA11. One data setting use location SA111, SA112 or SA113 corresponding to the key identification information is determined. Then, the DSP 70 sets the program data of one data setting / use location SA111, SA112 or SA113 in the temporary processing target data D19, and proceeds to the next step SP43.

  In step SP43, the DSP 70 generates the actual use key data D20 by decrypting the temporary processing target data D19 using the temporary key data D18 in accordance with the data decryption program EP2, and then proceeds to the next step SP44. In step SP44, the DSP 70 stores the actual use key data D20 in the memory 30, and proceeds to the next step SP45. In step SP45, the DSP 70 generates compressed encoded music data by decrypting the encrypted music data using the actual use key data D20 according to the data decryption program EP2, and generates the compressed encoded music data according to the decompression program. Music data is generated by performing the decompression process, and the music data is transmitted to the audio processing unit 20, and the process proceeds to the next step SP46.

  In step SP46, the DSP 70 determines whether or not to stop the data processing circuit 63 from being activated. As a result, when the DSP 70 obtains a negative result in order to keep the data processing circuit 63 in operation while the recording / reproducing apparatus 61 is in operation, the DSP 70 returns to step SP41. By the way, if a negative result is obtained in the above-described step SP41, this indicates that the user has not yet requested reproduction of the encrypted music data. Therefore, the DSP 70 proceeds to step SP46 at this time. Therefore, the DSP 70 thereafter repeats the processing of steps SP41 to SP46 cyclically every time reproduction of the encrypted music data is requested until a positive result is obtained in step SP46. Play the data. When the DSP 70 obtains a positive result by stopping the data processing circuit 63 in response to the start / stop of the recording / reproducing device 61 in step SP46, the DSP 70 proceeds to the next step SP47 and performs the fourth data processing control process. The procedure RT5 is terminated. In this way, the DSP 70 executes the fourth data processing control processing procedure RT5 every time the recording / reproducing apparatus 61 is activated.

  Next, as shown in FIG. 14, the data processing circuit 67 of the music providing server 65 is formed as a circuit board on which an IC chip that constitutes a tamper-resistant memory 75 and a DSP-configured codec processing unit 76 is mounted. Has been. The data processing circuit 67 having a circuit board configuration is manufactured by, for example, a manufacturer of the recording / reproducing apparatus 61. When the data processing circuit 67 is manufactured, the manufacturer of the recording / reproducing apparatus 61, like the data processing circuit 63 of the recording / reproducing apparatus 61, program data of the first and second parts FA11 and SA11 in the data decoding program EP2. Are set in the temporary key data D18 and the temporary processing target data D19, and the temporary processing target data D19 is decrypted by using the temporary key data D18 in accordance with the data decryption program EP2, whereby a plurality of types of actually used key data are obtained. D20 is generated. The manufacturer stores the plural types of actual use key data D20 in the memory 75 of the data processing circuit 67 together with the corresponding key identification information. The manufacturer also stores a data encryption program, a compression encoding program, and a data reversible processing control program in the memory 75 of the data processing circuit 67 as in the case of the first embodiment described above. Then, the manufacturer provides the data processing circuit 67 having such a circuit board configuration to the operating company of the music providing server 65 and incorporates it in the music providing server 65.

  In this case, when music data for music distribution is supplied from the outside, the central processing unit 66 sends the music data to the codec processing unit 76 of the data processing circuit 67. When the music data for music distribution is given from the central processing unit 66, the codec processing unit 76 performs compression coding processing on the music data in accordance with the compression coding program in the memory 75 to generate compression coded music data. . The codec processing unit 76 sends the compression-encoded music data to the hard disk drive 42 via the central processing unit 66 and stores it in the hard disk. In this way, the central processing unit 66 stores the distributable music data in the hard disk drive 42 as the compression encoded music data.

  When the music providing server 65 is activated for the first time, the central processing unit 66 performs data processing on the key identification information of the actually used key data D20 that is selected to be used first in the encryption processing of the compression encoded music data, for example. This is notified to the codec processing unit 76 of the circuit 67. Thus, when the key identification information is notified from the central processing unit 66, the codec processing unit 76 of the data processing circuit 67 receives one of the plurality of types of actually used key data D20 in the memory 75 corresponding to the key identification information. The actual use key data D20 is set to be used for the encryption process. Thereafter, the central processing unit 66 is periodically instructed to change the actual use key data D20 by, for example, the operating company of the music providing server 65, and is notified of the key identification information of the actual use key data D20 newly used for the encryption process. In response to this, the codec processing unit 76 of the data processing circuit 67 is notified of the change of the actual key data D20 together with the key identification information. As a result, the codec processing unit 76 of the data processing circuit 67 selects one actual used key data D20 corresponding to the key identification information notified from the central processing unit 66 among the plurality of types of actual used key data D20 in the memory 75. Set again to use for encryption processing. In this way, every time the central processing unit 66 notifies the change of the actual use key data D20 together with the key identification information, the codec processing unit 76 changes one actual use key data D20 used for the encryption process.

  Under such circumstances, when the distribution request signal is transmitted from the recording / reproducing apparatus 61 in response to a distribution request for a desired music piece by the user via the network NT, the central processing unit 66 sends the distribution request signal to the network interface 48. And the communication processing unit 49 is taken in sequentially. The central processing unit 66 selectively reads out the compressed encoded music data corresponding to the music requested to be distributed by the user from the hard disk drive 42 in response to the distribution request signal, and the read compressed encoded music data as data. The data is sent to the codec processing unit 76 of the processing circuit 67. When the compression encoded music data to be distributed is given from the central processing unit 66, the codec processing unit 76 stores the data encryption program from the memory 75 and the actual use key set to be used for the encryption process at that time. Read data D20. Then, the codec processing unit 76 generates encrypted music data by encrypting the compression-encoded music data using the actual use key data D20 in accordance with the data encryption program. In this way, when the codec processing unit 76 generates the encrypted music data from the compression encoded music data to be distributed, the code identification unit 76 identifies the encrypted music data as the key identification of the actually used key data D20 used for the encryption process at this time. The information is sent to the central processing unit 66 together with the information. Thereby, the central processing unit 66 transmits the encrypted music data together with the key identification information to the recording / reproducing apparatus 61 via the communication processing unit 49 and the network interface 48 via the network NT. In this way, the central processing unit 66 can distribute the encrypted music data to the recording / reproducing apparatus 61 together with the key identification information of the actual use key data D20 used for the encryption processing.

  In practice, when the music providing server 65 is activated, the codec processing unit 76 of the data processing circuit 67 performs the second data reversible processing control processing procedure RT6 shown in FIG. 21 according to the data reversible processing control program stored in the memory 75 in advance. Start. When the codec processing unit 76 starts the second data reversible process control processing procedure RT6, the key notified from the central processing unit 66 at this time among the plural types of actual use key data D20 in the memory 75 in step SP51. One actual use key data D20 corresponding to the identification information is set to be used for the encryption process, and the process proceeds to the next step SP52. In step SP52, the codec processing unit 76 determines whether or not to perform encryption processing on the compression-coded music data to be distributed. If a negative result is obtained in this step SP52, this means that the distribution of music is not requested from the recording / reproducing apparatus 61 at this time. Accordingly, the codec processing unit 76 proceeds to step SP53 at this time. In step SP53, the codec processing unit 76 determines whether to change the actual use key data D20 used for the encryption process. If a negative result is obtained in step SP53, this means that the central processing unit 66 has not been notified of the change of the actual use key data D20 together with the key identification information at this time. Accordingly, the codec processing unit 76 returns to step SP52 at this time. Accordingly, the codec processing unit 76 thereafter repeats the processing of step SP52 and step SP53 cyclically until obtaining a positive result at step SP52 and step SP53, thereby performing the encryption processing for the compression encoded music data. It waits for a request to change the execution and actual use key data D20.

  If a positive result is obtained in step SP53, this indicates that the change of the actual use key data D20 is notified from the central processing unit 66 together with the key identification information at this time. Accordingly, the codec processing unit 76 proceeds to the next step SP54 at this time. In step SP54, the codec processing unit 76 encrypts one actual use key data D20 corresponding to the key identification information newly notified from the central processing unit 66 among the plurality of kinds of actual use key data D20 in the memory 75. The real key data D20 used for the encryption process is changed by resetting it to be used for the encryption process, and the process returns to step SP52. If an affirmative result is obtained in step SP52, this indicates that the recording / playback apparatus 61 has requested distribution of music at this point. That is, this positive result indicates that the compression-coded music data to be distributed has been given from the central processing unit 66. Accordingly, the codec processing unit 76 proceeds to step SP55 at this time.

  In step SP55, the codec processing unit 76 uses the latest used key data D20 (that is, set to be used for encryption processing at this time) according to the data encryption program in the memory 75, and performs such compression. Encrypted music data is generated by encrypting the encoded music data, and the process proceeds to the next step SP56. Accordingly, in step SP56, the codec processing unit 76 associates the encrypted music data with the key identification information of the actual use key data D20 used for the encryption processing at this time, and the encrypted music data and the key identification information. Is sent to the central processing unit 66, and the process returns to step SP52. In this way, the codec processing unit 76 thereafter repeats the processing of step SP52 to step SP56 in a cyclic manner, appropriately changes the actual key data D20 used for the encryption processing, and requests distribution of music. Each time, the encrypted music data is generated by encrypting the compression-coded music data to be distributed using the latest actual use key data D20.

  In the above configuration, when the recording / reproducing apparatus 61 is activated, the central processing unit 62 sends the key identification information of the actual use key data D17 used for the encryption processing together with the encryption firmware to the data processing circuit 63. In response to this, the DSP 70 of the data processing circuit 63 stores the entire program data of the first portion FA10 in the firmware decoding program EP1 as it is based on the initial setting information in accordance with the data processing control program stored in the memory 30 in advance. The temporary key data D15 is set. The DSP 70 also uses one data setting use location corresponding to the key identification information among the plurality of data setting use locations SA101 to SA103 in the second part SA10 of the firmware decryption program EP1 based on the initial setting information and the key identification information. Only the program data of SA101, SA102 or SA103 is set as one temporary processing target data D16 (step SP31). Then, the DSP 70 generates the actual use key data D17 by decrypting the temporary processing target data D16 using the temporary key data D15 according to the firmware decryption program EP1, and stores the generated actual use key data D17 in the memory 30. Store (step SP32 and step SP33). In this state, the DSP generates decrypted firmware by decrypting the encrypted firmware using the actual use key data D17 in accordance with the firmware decryption program EP1, and stores the decrypted firmware in the memory 30 (step SP34).

  In the recording / reproducing apparatus 61, when the reproduction of the encrypted music data is requested, the central processing unit 62 obtains the encrypted music data to be processed and the key identification information of the actually used key data D20 used for the encryption process. The data is sent to the data processing circuit 63 (step SP41). In response to this, the DSP 70 of the data processing circuit 63 follows the data processing control program stored in the memory 30 in advance, and the entire program data of the first portion FA11 in the data decoding program EP2 is directly stored as one temporary data based on the initial setting information. To the key data D18. The DSP 70 also uses one data setting use location corresponding to the key identification information among the plurality of data setting use locations SA111 to SA113 in the second part SA11 of the data decryption program EP2 based on the initial setting information and the key identification information. Only the program data of SA111, SA112 or SA113 is set as one temporary processing target data D19 (step SP42). Then, the DSP 70 generates the actual use key data D20 by decrypting the provisional processing target data D19 using the provisional key data D18 in accordance with the data decryption program EP2, and generates the actual use key data D20 in the memory 30. Store (step SP43 and step SP44). In this state, the DSP 70 generates compressed encoded music data by decrypting the encrypted music data using the actual use key data D20 according to the data decryption program EP2, and generates the compressed encoded music data according to the decompression program. Music data is generated by the decompression process (step SP45).

  Accordingly, in the recording / reproducing apparatus 61, the program data itself in the firmware decryption program EP1 and the data decryption program EP2 is used as temporary key data D15, D18 and temporary processing target data D16 used to generate the actual use key data D17 and D20. Therefore, even if the firmware decryption program EP1 and the data decryption program EP2 are illegally obtained by a third party, the temporary key data D15 and D18 and the provisional processing target data D16 and D19 are obtained by the third party. Can be almost certainly prevented. In the recording / reproducing apparatus 61, a plurality of data setting / use locations SA101 to SA103 and SA111 to SA113 are prepared in the firmware decryption program EP1 and the data decryption program EP2, and the data setting / use locations SA101 to SA103 and SA111 to SA113 are prepared. The temporary setting data D16 and D19 itself are appropriately changed by appropriately changing and selecting the program data of the selected data setting use locations SA101 to SA103 and SA111 to SA113 as the temporary processing target data D16 and D19. ing. Therefore, in the recording / reproducing apparatus 61, even if the firmware decryption program EP1 and the data decryption program EP2 are illegally obtained by a third party, it is further ensured that the provisional processing target data D16 and D19 are specified by the third party. Can be prevented. For this reason, in the recording / reproducing apparatus 61, it is possible to prevent the actual use key data D17 and D18 from leaking to a third party more reliably than in the case of the first embodiment described above.

  On the other hand, in the music providing server 65, the central processing unit 66 periodically changes the key identification information of the actual use key data D20 used for the encryption process and notifies the data processing circuit 67 of the key identification information. In response to this, the codec processing unit 76 of the data processing circuit 67 encrypts the actual use key data D20 corresponding to the key identification information among the plural types of actual use key data D20 stored in the memory 75 in advance. By changing the setting so that the actual use key data D20 used for the encryption processing is periodically changed (step SP51 and step SP54). In this state, when the distribution of the music is requested, the central processing unit 66 sends the compression-coded music data corresponding to the music to the data processing circuit 67. At this time, the codec processing unit 76 of the data processing circuit 67 uses the actual use key data D20 set to be used for the encryption processing at that time according to the data encryption program in the memory 75, and performs such compression encoding. Encrypted music data is generated by encrypting the music data, and the key identification information of the actual key data D20 used for the encryption processing is associated with the encrypted music data (step SP55 and step SP56). ). The central processing unit 66 distributes the encrypted music data and the key identification information to the recording / reproducing apparatus 61.

  Therefore, even if the actual use key data D20 used for the encryption process of the compression encoded music data is appropriately changed, the music providing server 65 uses the key identification information of the actual use key data D20 used for the encryption process as the encrypted music. By distributing the data together with the data to the recording / reproducing apparatus 61, the recorded / reproducing apparatus 61 can accurately decrypt the encrypted music data using the actual use key data D20 corresponding to the key identification information. Then, even if the music use server 65 appropriately changes the actual use key data D20 used for the encryption process, the actual use key data D20 itself is not transferred to and from the recording / reproducing device 61, but the actual use key data D20 is transferred. Therefore, the actual use key data D20 used for the decryption process is notified and the actual use key data D20 can be prevented from being leaked by the transfer.

  According to the above configuration, in the recording / reproducing apparatus 61, the central processing unit 62 sends the key identification information together with the encrypted firmware to the data processing circuit 63, and the DSP 70 of the data processing circuit 63 receiving the key identification information based on the initial setting information. The entire program data of the first part FA10 in the firmware decryption program EP1 is set as it is in one temporary key data D15 as it is, and in the second part SA10 of the firmware decryption program EP1 based on the initial setting information and the key identification information. Of the plurality of data setting / use locations SA101 to SA103, only the program data of one data setting / use location SA101, SA102 or SA103 corresponding to the key identification information is set as one temporary processing target data D16, and the firmware decryption program Temporary according to EP1 The actual use key data D17 is generated and stored by decrypting the temporary processing target data D16 using the data D15, and thus the encrypted firmware is decrypted using the actual use key data D17 in accordance with the firmware decryption program EP1. I did it. Accordingly, the recording / reproducing apparatus 61 appropriately changes and selects the plurality of data setting / use points SA101 to SA103 used for setting the temporary processing target data D16 in the firmware decryption program EP1, and selects the selected data setting / use points SA101 to SA101. Even if the firmware decryption program EP1 is illegally acquired by a third party, the temporary processing target data D16 itself is appropriately changed so that the program data of SA103 is set as the temporary processing target data D16. It is possible to more reliably prevent the target data D16 from being specified. As a result, the recording / reproducing apparatus 61 can more reliably prevent the actual use key data D17 from leaking to a third party than in the case of the first embodiment described above, and thus the actual use key. The confidentiality of the data D17 can be further improved.

  In the recording / reproducing apparatus 61, the central processing unit 62 sends the key identification information to the data processing circuit 63 together with the encrypted music data to be processed, and the DSP 70 of the data processing circuit 63 that receives the key identification information decrypts the data based on the initial setting information. The entire program data of the first part FA11 in the program EP2 is set as it is as one temporary key data D18, and a plurality of data in the second part SA11 of the data decryption program EP2 is set based on the initial setting information and the key identification information. Of the data setting use locations SA111 to SA113, only one program setting use location SA111, SA112 or SA113 corresponding to the key identification information is set as one temporary processing target data D19, and according to the data decryption program EP2. Temporary processing using temporary key data D18 It generates and stores the actual use key data D20 by decoding the object data D19, was thus so as to decoding the encrypted music data using the actual use key data D20 in accordance with the data decoding program EP2. Accordingly, the recording / reproducing apparatus 61 appropriately changes and selects the plurality of data setting use locations SA111 to SA113 used for setting the provisional processing target data D19 in the data decoding program EP2, and selects the selected data setting use locations SA111 to SA111. Even if the data decryption program EP2 is illegally acquired by a third party, the temporary processing target data D19 itself is appropriately changed so that the program data of SA113 is set as the temporary processing target data D19. It is possible to more reliably prevent the target data D19 from being specified. As a result, the recording / reproducing apparatus 61 can more reliably prevent the actual use key data D20 from leaking to a third party than in the case of the first embodiment described above, and thus the actual use key. The confidentiality of the data D20 can be further improved.

  Further, in the music providing server 65, the central processing unit 66 periodically changes the key identification information and notifies the data processing circuit 67, and in response to this, the codec processing unit 76 of the data processing circuit 67 performs a plurality of operations in the memory 75. The actual use key data D20 corresponding to the key identification information among the types of actual use key data D20 is set to be used for the encryption process, and the central processing unit 66 sends the compression encoded music data to the data processing circuit 67. When the data is transmitted, the codec processing unit 76 of the data processing circuit 67 that has received the data uses the actual use key data D20 set to be used for the encryption processing at that time in accordance with the data encryption program. Encrypted music data is encrypted to generate encrypted music data, and the encrypted music data is encrypted. And to associate the key identification information of the actual use key data D20 used. Therefore, the music providing server 65 can obtain the effects obtained by the above-described first embodiment. In addition, even if the music providing server 65 appropriately changes the actual use key data D20 used for the encryption processing of the compression encoded music data, the music providing server 65 uses the key identification information of the actual use key data D20 used for the encryption processing. By distributing to the recording / reproducing apparatus 61 together with the encrypted music data, it is possible to cause the recording / reproducing apparatus 61 to decrypt the encrypted music data easily and accurately corresponding to the change of the actual use key data D20. It is also possible to prevent the use key data D20 from leaking due to transfer. Furthermore, the music providing server 65 can further improve the confidentiality of the actual use key data D20 by appropriately changing the actual use key data D20 used for the encryption process.

  Further, in the recording / reproducing apparatus 61, in the second portions SA10 and SA11 in the firmware decryption program EP1 and the data decryption program EP2, the plurality of data setting use locations SA101 to SA103 and SA111 to SA113 are partially overlapped in order, The data setting use locations SA101 to SA103 and SA111 to SA113 in the firmware decryption program EP1 and the data decryption program EP2 can be easily increased. As a result, the recording / reproducing apparatus 61 effectively uses the program data in the firmware decryption program EP1 and the data decryption program EP2 to increase the number of changes as much as possible together with the number of provisional processing target data D16 and D19. It is possible to make it difficult to specify the processing target data D16 and D19. In the recording / reproducing apparatus 61, the firmware decoding program EP1 and the data decoding program EP1 and the data decoding program EP2 also partially overlap the first and second portions FA10, FA11 and SA10, SA11. By effectively using the program data in the program EP2, it is possible to easily set a large number of temporary processing target data D16 and D19 together with the temporary key data D15 and D18.

  Further, the music providing server 65 does not store the music data that can be distributed in advance by encrypting it, but stores the music data as compressed encoded music data obtained by the compression encoding process so that the music can be distributed. When requested, the compression-encoded music data corresponding to the music requested to be distributed is encrypted using the actual use key data D20 set to be used for the encryption process at that time. Regardless of the time when possible music data is acquired from the outside, the music data can always be encrypted and distributed using the latest actual use key data D20. As a result, the music providing server 65 can prevent the safety of the actual usage key data D20 from being lowered by continuing to use the specific actual usage key data D20 for a long period of time.

  In the above-described second embodiment, the data processing circuit 63 of the recording / reproducing apparatus 61 has been described as being able to change only the provisional processing target data D16 and D19. The program data of the entire second portion SA12 in the firmware decryption program EP1 and the data decryption program EP2 is set as it is as one temporary processing target data D24 as shown in FIG. A plurality of types of temporary key data D25 can be set from the program data of the first part FA12 in the firmware decryption program EP1 and the data decryption program EP2 as in the case of the provisional processing target data D16 and D19 described above. You may do it. Even if it does in this way, the effect similar to 2nd Embodiment mentioned above can be acquired. Further, as shown in FIG. 22B, in the data processing circuit 63 of the recording / reproducing apparatus 61, from the program data of both the first and second parts FA13 and SA13 in the firmware decoding program EP1 and the data decoding program EP2, respectively. As in the case of the provisional processing target data D16 and D19 described above, a plurality of types of provisional key data D26 and a plurality of types of provisional processing target data D27 may be settable. In this way, it is possible to make it more difficult to specify both the temporary key data D26 and the temporary processing target data D27 as much as they can be changed. When both the temporary key data D26 and the temporary processing target data D27 can be changed, the temporary key data D26 and the temporary processing target data D27 may be changed at the same time or at different timings. You can also change it. Furthermore, when both the temporary key data D26 and the temporary processing target data D27 can be changed, one of the temporary key data D26 and the temporary processing target data D27 is fixedly used. After changing all of the other in order, a plurality of types of temporary key data D26 and temporary These can be sequentially changed so as to realize all combinations of the processing target data D27. As a result, for the temporary key data D26 and the temporary processing target data D27, the number of combinations for generating the actual use key data can be dramatically increased, and the actual use key data can be further prevented from leaking. .

  In the above-described second embodiment, the case where the actual use key data D17 and D20 are changed periodically has been described. However, the present invention is not limited to this, and the actual use key data D17 and D20 are changed. For example, the firmware decryption program EP1 and the data decryption program EP2 may be changed at an arbitrary timing such as when there is a possibility that the firmware decryption program EP1 and the data decryption program EP2 have leaked to the outside.

  Further, in the second embodiment described above, in the data processing circuit 63 of the recording / reproducing apparatus 61, the first and second parts FA10, FA11 and SA10, SA11 in the firmware decoding program EP1 and the data decoding program EP2 are stored. Although the case where the program data is set to the temporary key data D15 and D18 and the temporary processing target data D16 and D19 has been described, the present invention is not limited to this, and in the data processing circuit 63 of the recording / reproducing apparatus 61, An encryption program is prepared for encryption processing by a predetermined encryption processing method applied to a portable recording / reproducing apparatus, for example, which is different from the encryption processing method used when the music providing server 65 generates encrypted music data. In addition, the program data of the first and second parts in the encryption program is used as a temporary key. Over data and set to the temporary processing target data may be a temporary processing target data by using the temporary key data in accordance with the encrypted program to produce actual use key data by encrypting. In this way, the recording / playback apparatus 61 once decrypts the encrypted music data acquired from the music providing server 65 to generate compression-encoded music data, and then uses the actual use key data according to the encryption program. By encrypting the compression-encoded music data and generating the encrypted music data again, the encrypted music data is transferred to an external portable recording / reproducing device and encrypted by the portable recording / reproducing device. You can listen to music based on music data.

  Furthermore, in the second embodiment described above, the case where the data processing circuit 63 generates the actual use key data D17 each time the recording / reproducing apparatus 61 is activated has been described. However, the present invention is not limited to this. First, once the actual use key data D17 is generated in the data processing circuit 63, it is held as it is, and only when the change of the actual use key data D17 is notified, the actual use key data D17 is regenerated. You may do it. Further, in the data processing circuit 63, all the actual use key data D17 are generated and held in advance, and when a change in the actual use key data D17 is notified, the data processing circuit 63 is selected from a plurality of types of actual use key data D17. The actually used key data D17 to be newly used may be selected and used. In this way, it is possible to reduce a processing load on the data processing circuit 63 when the recording / reproducing apparatus 61 is activated.

  Furthermore, in the above-described second embodiment, the case where the data processing circuit 63 generates the actual use key data D20 each time the encrypted music data is reproduced has been described. However, the present invention is not limited to this. First, the data processing circuit 63 generates and holds all the actual use key data D20 in advance, and when reproducing the encrypted music data, the corresponding actual use among the plurality of types of actual use key data D20. The key data D20 may be selected and used. Further, in the data processing circuit 63, when the encrypted music data is reproduced, once the actual use key data D20 is generated, it is held as it is so that it can be used thereafter, and any actual use key data D20 is generated only once. You may make it do. In this way, it is possible to reduce the processing load on the data processing circuit 63 when the encrypted music data is processed.

(3) Third Embodiment In FIG. 23 in which the same reference numerals are assigned to the corresponding parts to FIG. 1, in the recording / reproducing system 80 according to the third embodiment, the same reference numerals are assigned to the corresponding parts to FIG. As shown in FIG. 24, the central processing unit 82 and the data processing circuit 83 of the recording / reproducing apparatus 81 have different configurations from the central processing unit 13 and the data processing circuit 19 of the recording / reproducing apparatus 2 according to the first embodiment. is doing. Further, in the recording / reproducing system 80, as shown in FIG. 25 in which parts corresponding to those in FIG. 9 are assigned the same reference numerals, the central processing unit 86 and the data processing circuit 87 of the music providing server 85 provide the music according to the first embodiment. The central processing unit 40 and the data processing circuit 45 of the server 3 have different configurations.

  In this case, the music providing server 85 (FIG. 25) can realize the same function as that of the music providing server 3 according to the first embodiment described above, and can be used for listening to the recording / playback device 81. Audition data can be provided. That is, the central processing unit 86 of the music providing server 85 receives a large number of pieces of trial data generated by cutting out a part of music data (for example, corresponding to the rust part of the music) from the outside via the network NT. When the data is supplied by the communication or the conveyance of the recording medium on which the music data is recorded, the trial listening data is sent to the data processing circuit 87.

  In this case, the data processing circuit 87 is formed as a circuit board on which an IC chip that constitutes the memory 46 and the DSP configuration codec processing unit 88 is mounted, as in the case of the first embodiment described above. Yes. The codec processing unit 88 of the data processing circuit 87 reads the compression encoding program, the encryption program, and the actual use key data D6 from the memory 46 when the trial listening data is given from the central processing unit 86. Then, the codec processing unit 88 performs compression encoding processing on the trial listening data in accordance with the compression encoding program, thereby generating compression encoded trial listening data. Further, the codec processing unit 88 generates the encrypted trial listening data by encrypting the compressed encoded trial listening data using the actual use key data D6 in accordance with the encryption program. In this way, when the codec processing unit 88 generates the encrypted trial listening data, the codec processing unit 88 sends the generated encrypted trial listening data to the hard disk drive 42 via the central processing unit 86 and stores it in the hard disk.

  When the trial request signal is transmitted from the recording / playback device 81 in response to the user's request for listening to the desired music via the network NT, the central processing unit 86 sends the trial request signal to the network interface 48 and the communication processing unit 49. Capture through sequentially. Thus, the central processing unit 86 selectively reads out the encrypted trial listening data corresponding to the music requested by the user from the hard disk drive 42 in response to the trial request signal, and reads out the read encrypted trial listening data. The data is transmitted to the recording / reproducing apparatus 81 via the network NT via the communication processing unit 49 and the network interface 48 in order.

  On the other hand, the recording / reproducing apparatus 81 (FIG. 24) can realize the same functions as those of the recording / reproducing apparatus 2 according to the first embodiment described above. In addition to this, the central processing unit 82 of the recording / playback apparatus 81 receives a test request signal in response to an operation input signal for requesting a test piece of a desired piece of music from the user via the operation input unit 10. It transmits to the music provision server 85 via the communication processing part 17 and the network interface 18 in order. As a result, the central processing unit 82 fetches the encrypted trial listening data of the desired music transmitted from the music providing server 85 via the network interface 18 and the communication processing unit 17 in order. As a result, the central processing unit 82 transmits the encrypted trial listening data to the data processing circuit 83.

  The data processing circuit 83 uses the key data D6 to decrypt the encrypted trial listening music data in the same manner as the data processing circuit 19 of the first embodiment described above decrypts the encrypted music data. Generate compression-encoded audition data. Further, the data processing circuit 83 generates trial listening data by decompressing the compression-coded trial listening data. Further, the data processing circuit 83 performs sound quality deterioration processing on the trial listening data, and sends the obtained listening sound quality deterioration data to the sound processing unit 20. The audio processing unit 20 performs audio processing such as digital-analog conversion and amplification on the trial sound quality deterioration data provided from the data processing circuit 83, and sends the obtained test sound quality deterioration signal to the speaker 21. As a result, the audio processing unit 20 can output a test piece music whose sound quality is deteriorated based on the test sound quality deterioration signal from the speaker 21 and allow the user to make a test sound.

  Here, the sound quality deterioration process executed in the data processing circuit 83 will be described with reference to FIG. First, the data processing circuit 83 generates actual use key data used for sound quality degradation processing. Further, the data processing circuit 83 sequentially divides the trial listening data, for example, into predetermined units, and obtains the individual divided trial listening data and the individual bit data from the upper bits to the lower bits constituting the actual use key data. Are matched in order. As a result, the data processing circuit 83 does not change the value of the lower 2 bits of the trial listening divided data for each of the trial listening divided data associated with the “0” bit of the actually used key data. To. On the other hand, the data processing circuit 83 bit-inverts the value of the lower 2 bits of the divided data for trial listening for each piece of divided data for trial listening associated with the “1” bit of the actually used key data. . Then, the data processing circuit 83 connects the divided trial listening data so as to restore the original arrangement again, thereby generating trial listening sound quality deterioration data obtained by joining the divided trial listening data. In this way, the data processing circuit 83 performs a sound quality degradation process on the trial listening data so that the bit data constituting the trial listening data is appropriately bit-inverted so as to be different from the original configuration, thus improving the sound quality of the trial listening music. Deteriorated sound quality degradation data for listening is obtained.

  Here, in FIG. 27 in which the same reference numerals are assigned to the parts corresponding to those in FIG. 3, the data processing circuit 83 is formed as a circuit board on which IC chips constituting the memory 90 and the DSP 91 are mounted. In this case, the data processing circuit 83 stores a data processing control program for basic operation in the memory 90 in advance. The DSP 91 of the data processing circuit 83 executes a decoding process using the decoding program, a decompression process using the decompression program, and a sound quality degradation process using the sound quality degradation program according to the data processing control program in the memory 90. Also, key data generation processing for generating actual use key data D3 and D6 is executed. However, in the configuration of the data processing circuit 83 of FIG. 27 shown below, as in the case of the first embodiment described above, various functions of the DSP 91 are regarded as function blocks (that is, the data setting unit 92, the key data). The generation unit 93 and the codec processing unit 94) will be described.

  First, the manufacturer of the recording / playback apparatus 81 uses the data processing program 83 to decrypt the encrypted music data and the encrypted trial listening data in the data processing circuit 83, and the compressed encoded music data and the compressed encoded trial data. Encrypted firmware is generated by pre-encrypting the firmware that contains the decompression program for decompressing the sound, the sound quality degradation program for processing the sound quality degradation of the audition data using the predetermined actual use key data is doing. The manufacturer stores such encrypted firmware in the ROM 14 or the hard disk drive 15 of the recording / reproducing apparatus 81. The central processing unit 82 reads the encrypted firmware from the ROM 14 or the hard disk drive 15 every time the recording / reproducing device 81 is activated, transfers the read encrypted firmware to the data processing circuit 83, and temporarily stores it in the memory 90. .

  The memory 90 of the data processing circuit 83 stores a data processing control program and a firmware decoding program EP1. Then, the data setting unit 92 and the key data generation unit 93 of the data processing circuit 83 generate the actual use key data D3 used for the decryption process of the encrypted firmware in the same manner as in the first embodiment described above, and The generated actual use key data D3 is stored in the memory 90. As a result, the codec processing unit 94 decrypts the encrypted firmware in the same manner as in the first embodiment described above, thus obtaining the decrypted firmware and storing it in the memory 90.

  Further, when the data setting unit 92 and the key data generation unit 93 decrypt the firmware and obtain the data decryption program EP2, the data decompression program, and the sound quality degradation program, they are the same as in the case of the first embodiment described above. The actual use key data D6 used for the decryption processing of the encrypted music data and the encrypted trial listening data is generated, and the generated actual use key data D6 is stored in the memory 90. As a result, when the reproduction of the encrypted music data is requested, the codec processing unit 94 decrypts the encrypted music data in the same manner as in the first embodiment described above, and then obtains the compression encoding obtained. Music data is generated by decompressing the music data, and is sent to the audio processing unit 20.

  In addition, as shown in FIG. 28, when the data setting unit 92 obtains the sound quality deterioration program EP10 by decrypting the firmware, the data setting unit 92 selects in advance the sound quality deterioration program EP20 based on the initial setting information. The first part FA20 composed of one part is determined, and the second part SA20 composed of one part partially overlapping with the first part FA20 is determined. Then, the data setting unit 92 sets the program data of the first portion FA20 in the entire program data forming the sound quality deterioration program EP10 as temporary key data D30 used for sound quality deterioration processing that can be executed according to the sound quality deterioration program EP10. To do. In addition, the data setting unit 92 sets the program data of the second portion SA20 in the entire program data forming the sound quality deterioration program EP10 as temporary processing target data D31 used for the sound quality deterioration process that can be executed according to the sound quality deterioration program EP10. Set. In this way, the data setting unit 92 sends the temporary key data D30 and temporary processing target data D31 set using the sound quality deterioration program EP10 to the key data generation unit 93.

  The key data generation unit 93 reads the sound quality deterioration program EP10 from the memory 90 when provisional key data D30 and provisional processing target data D31 are given from the data setting unit 92. Then, the key data generation unit 93 performs sound quality deterioration processing on the temporary processing target data D31 using the temporary key data D30 in the same procedure as described above with reference to FIG. 26 according to the sound quality deterioration program EP10. That is, the key data generation unit 93 sequentially divides the temporary processing target data D31 into predetermined units as sound quality deterioration processing, and configures the obtained temporary processing target divided data and temporary key data D30. The individual bit data from the upper bit to the lower bit are associated in order. As a result, the key data generation unit 93, for each piece of temporary processing target divided data, associated with the “0” bit of the temporary key data D30, the lower two bits of the temporary processing target divided data. Do not change any value. On the other hand, the key data generation unit 93, for each piece of temporary processing target divided data, associated with the “1” bit of the temporary key data D30, the lower 2 bits of the temporary processing target divided data Inverts the value of. Then, the key data generation unit 93 generates the actual use key data D32 formed by connecting the temporary processing target divided data by connecting the individual temporary processing target divided data so as to restore the original arrangement again. To do. In this way, the key data generation unit 93 sends the actual use key data D32 to the memory 90, and thus stores the actual use key data D32 in the memory 90.

  In this state, the central processing unit 82 is requested to audition the music by the user, and when the encrypted trial listening data is acquired from the music providing server 85 in response to the request, the central processing unit 82 transfers the encrypted trial listening data to the data processing circuit 83. Temporarily stored in the memory 90. At this time, the codec processing unit 94 of the data processing circuit 83 reads out the data decryption program EP2, the decompression program, and the sound quality deterioration program from the memory 90, and also uses the actually used key data D6 and the sound quality deterioration used for the decryption process of the encrypted trial listening data. The actual use key data D32 used for processing is also read. The codec processing unit 94 reads out the encrypted trial listening data temporarily stored in the memory 90 and performs compression encoding by decrypting the encrypted trial listening data using the actual use key data D6 in accordance with the data decryption program EP2. Generate audition data. The codec processing unit 94 generates trial listening data by decompressing the compression-encoded trial listening data according to the decompression program. Further, the codec processing unit 94 performs sound quality deterioration processing on the trial listening data for each predetermined division of the trial listening data using the actual use key data D32 in the same procedure as described above with reference to FIG. 26 according to the sound quality deterioration program. Generate audio quality degradation data for trial listening. Then, the codec processing unit 94 sends the trial listening sound quality deterioration data to the sound processing unit 20.

  In this way, the data processing circuit 83 outputs the sampled music based on the sampled sound quality deterioration data from the speaker 21 by appropriately bit-inverting the bit data constituting the sampled data to generate the sampled sound quality deteriorated data. When this is done, the user can have the user listen to the sample music in a state different from the original sound quality (that is, deteriorated).

  In practice, when the DSP 91 of the data processing circuit 83 decrypts the firmware and obtains the sound quality deterioration program EP10, the DSP 91 of the data processing circuit 83 starts the fifth data processing control processing procedure RT7 shown in FIG. 29 according to the data processing control program. When starting the fifth data processing control processing procedure RT7, the DSP 91 determines the first part FA20 in the sound quality deterioration program EP10 based on the initial setting information in step SP61, and determines the program of the determined first part FA20. Data is set to temporary key data D30. Further, the DSP 91 determines the second portion SA20 in the sound quality deterioration program EP10, sets the determined program data of the second portion SA20 in the temporary processing target data D31, and moves to the next step SP62.

  In step SP62, the DSP 91 generates the actual use key data D32 by performing the sound quality deterioration process on the temporary processing target data D31 using the temporary key data D30 in accordance with the sound quality deterioration program EP10, and proceeds to the next step SP63. In step SP63, the DSP 91 stores the actual use key data D32 in the memory 90, and proceeds to the next step SP64. In step SP64, the DSP 91 determines whether or not to execute data processing on the encrypted trial listening data. If an affirmative result is obtained in this step SP64, this indicates that the user has requested to listen to the music. That is, as a positive result, a processing start request for requesting the DSP 91 to start execution of data processing for the encrypted trial listening data is given from the central processing unit 82 to the DSP 91, and the central processing unit 82 is stored in the memory 90 of the data processing circuit 83. This indicates that the encrypted trial listening data to be processed transferred from is temporarily stored. Therefore, the DSP 91 proceeds to the next step SP65 at this time.

  Then, in step SP65, the DSP 91 generates compression-encoded sample data by decrypting the encrypted sample data using the actual use key data D6 according to the data decryption program EP2, and also generates the compression-encoded sample data according to the decompression program. Audition data is generated by decompressing the data for use. Further, the DSP 91 generates sound quality deterioration data for trial listening by performing sound quality deterioration processing on the data for trial listening using the actual use key data D32 in accordance with the sound quality deterioration program EP10, and proceeds to the next step SP66. In step SP66, the DSP 91 determines whether or not to stop the data processing circuit 83 from starting. As a result, if the DSP 91 obtains a negative result in order to keep the data processing circuit 83 in operation while the recording / reproducing apparatus 81 is in operation, the DSP 91 returns to step SP64. By the way, if a negative result is obtained in the above-described step SP64, this indicates that the user has not yet requested to listen to the music. Therefore, the DSP 91 proceeds to step SP66 at this time. For this reason, the DSP 91 thereafter repeats the processing from step SP64 to step SP66 in a cyclic manner every time the sample listening is requested until a positive result is obtained in step SP66. Listen to When the DSP 91 obtains a positive result by stopping the data processing circuit 83 in response to the start / stop of the recording / reproducing device 81 in step SP66, the DSP 91 proceeds to the next step SP67 and performs the fifth data processing control process. The procedure RT7 is terminated. In this way, the DSP 91 executes the fifth data processing control processing procedure RT7 every time the recording / reproducing apparatus 81 is activated.

  In the above configuration, when the recording / reproducing apparatus 81 is activated, the DSP 91 of the data processing circuit 83 follows the data processing control program stored in advance in the memory 90, and the first part FA20 in the sound quality deterioration program EP10 based on the initial setting information. Is set in the temporary key data D30, and the program data of the second portion SA20 in the sound quality deterioration program EP10 is set in the temporary processing target data D31 (step SP61). The DSP 91 generates actual use key data D32 by performing sound quality deterioration processing on the temporary processing target data D31 using the temporary key data D30 according to the sound quality deterioration program EP10, and the generated actual use key data D32 is stored in the memory 90. (Step SP62 and step SP63). In this state, the DSP 91 decrypts the encrypted sample data to be processed transferred from the central processing unit 13 using the actual use key data D6 in accordance with the data decryption program EP2 when the sample music is requested to be sampled. Compressed encoded trial listening data is generated by the above, and the compressed encoded trial listening data is generated according to the decompression program to generate the audition data, and then the actual listening key data D32 is used for the trial listening according to the sound quality deterioration program EP10. The sound quality deterioration data for trial listening is generated by subjecting the sound data to sound quality deterioration processing (step SP65).

  Therefore, in the recording / reproducing apparatus 81, since the program data itself in the sound quality deterioration program EP10 is the temporary key data D30 and temporary processing target data D31 used for generating the actual use key data D32, the sound quality deterioration program EP10 Even if the third party improperly acquires the temporary key data D30 and the temporary processing target data D31, the third party can be almost certainly prevented. In the recording / reproducing apparatus 81, since the original data for generating the actual use key data D32 is two types of data, the temporary key data D30 and the temporary processing target data D31, these temporary key data are provided to a third party. Analysis processing for the sound quality deterioration program EP10 for specifying D30 and provisional processing target data D31 can be complicated. Therefore, in the recording / reproducing apparatus 81, even if the sound quality deterioration program EP10 is illegally acquired by a third party, the temporary key data D30 and the temporary processing target data D31 are further prevented from being specified by the third party. can do. In the recording / reproducing apparatus 81, the temporary key data D30 and the temporary processing target data D31 in the sound quality deterioration program EP10 are not easily specified as described above, and the actual use key is included in the sound quality deterioration program EP10. Since the data D32 itself is not embedded, the actual use key data D32 can be almost certainly prevented from leaking to a third party.

  According to the above configuration, in the recording / reproducing apparatus 81, the DSP 91 of the data processing circuit 83 sets the program data of the first portion FA20 in the sound quality degradation program EP10 to the temporary key data D30 based on the initial setting information. Then, the program data of the second part SA20 in the sound quality deterioration program EP10 is set as the temporary processing target data D31, and the temporary processing target data D31 is deteriorated in sound quality using the temporary key data D30 according to the sound quality deterioration program EP10. By processing, the actual use key data D32 is generated and stored, and when trial listening to the music is requested, the trial listening data to be processed is subjected to the sound quality deterioration processing using the actual use key data D32 according to the sound quality deterioration program EP10. did. Accordingly, the recording / reproducing apparatus 81 sets the program data itself of the first and second portions FA20 and SA20 in the sound quality deterioration program EP10 as temporary key data D30 and temporary processing target data D31, respectively, and the sound quality deterioration program EP10. Therefore, even if the sound quality deterioration program EP10 is illegally acquired by a third party, the sound quality deterioration processing is performed on the temporary processing target data D31 using the temporary key data D30 to generate the actual use key data D32. It is possible to almost certainly prevent the provisional key data D30 and provisional processing target data D31 from being specified in the deterioration program EP10. As a result, the recording / reproducing apparatus 81 can almost certainly prevent the actual use key data D32 from leaking even if the sound quality deterioration program EP10 is illegally obtained by a third party, and thus the actual use key data D32. Can improve confidentiality

  Further, in the recording / reproducing apparatus 81, the actual use key data D32 is generated in combination with the sound quality deterioration program EP10 for executing the sound quality deterioration process for the trial listening data, so that the actual use key is stored in the memory 90 of the data processing circuit 83. It is not necessary to store a dedicated program for generating the data D32, and thus it is possible to avoid an increase in the capacity of the memory 90. Further, in the recording / reproducing apparatus 81, the first and second portions FA20 and SA20 of the program data set in the temporary key data D30 and the temporary processing target data D31 are partially overlapped in the sound quality deterioration program EP10. For example, even when the temporary key data D30 and the temporary processing target data D31 are relatively long in length, they can be reliably set as program data in the sound quality deterioration program EP10.

  In the third embodiment described above, the case where the data processing circuit 83 of the recording / playback apparatus 81 performs the sound quality degradation process on the trial listening data has been described. However, the present invention is not limited to this, and music provision is provided. The server 85 uses the actual key data D32 in accordance with the sound quality deterioration program EP10 to perform sound quality deterioration processing on the distributable music data, and then generates and stores encrypted music data by compression encoding processing and encryption processing. When the encrypted music data is processed in the data processing circuit 83 of the recording / reproducing device 81, the encrypted music data is decrypted and decompressed to generate music data, and then the actual use key data D32 is stored. The sound quality is degraded by performing reversible sound quality restoration processing that is reversible from the sound quality degradation processing that can be performed according to the sound quality restoration program. It may be returned to the state. In such a configuration, the actual use key data D32 may be generated by the music providing server 85, and the actual use key data D32 may be held in advance by the recording / reproducing device 81, or conversely, the recording / reproducing device 81. The actual use key data D32 may be generated by the music provision server 85 and the actual use key data D32 may be held in advance by the music providing server 85. In any configuration, such processing can be realized, and the recording / reproducing apparatus 81 and The same effect as that of the first embodiment described above can be obtained by both of the music providing servers 85.

  In the third embodiment described above, the program data of the first and second portions FA20 and SA20, which partially overlap in the sound quality deterioration program EP10, are stored as temporary key data D30 and temporary processing target data D31, respectively. Although the case where the setting is made has been described, the present invention is not limited to this, and in the data processing circuit 83 of the recording / reproducing apparatus 81, the first and second portions each including one portion that does not overlap in the sound quality deterioration program EP10. Partial program data may be set as temporary key data and temporary processing target data. Further, in the data processing circuit 83 of the recording / reproducing apparatus 81, the program data of the first part consisting of a plurality of parts in the sound quality deterioration program EP10 are connected and set as temporary key data, and a plurality of parts in the sound quality deterioration program EP10 are set. The program data of the second part, which is a part, may be connected and set as temporary processing target data. Even if it does in this way, the same effect as a 3rd embodiment mentioned above can be acquired. In particular, in the recording / reproducing apparatus 81, when the first and second parts are each formed by a plurality of parts, when the sound quality deterioration program EP10 is illegally acquired by a third party, the first and second parts each having a plurality of parts are obtained. It is possible to further make it difficult to specify the temporary key data and the temporary processing target data together with the portion 2.

  Further, in the above-described third embodiment, the case where the data processing circuit 83 generates the actual use key data D32 each time the recording / reproducing apparatus 81 is activated has been described. However, the present invention is not limited to this. First, in the data processing circuit 83, the actual use key data D32 is generated only when the recording / reproducing device 81 is activated for the first time, and is stored in the memory 90, so that the recording / reproducing device 81 is activated for the second and subsequent times. Sometimes the actual use key data D32 may not be generated. In this way, it is possible to significantly reduce the processing load on the data processing circuit 83 when the recording / reproducing apparatus 81 is started.

(4) Other Embodiments In the first to third embodiments described above, the data processing apparatus according to the present invention is applied to the recording / reproducing apparatuses 2, 61 and 81 described above with reference to FIGS. However, the present invention is not limited to this, and the music providing servers 3, 65 and 85 having a data processing circuit, personal computers, mobile phones, PDAs (Personal Digital Assistance), game machines, and compact disc players. The present invention can be widely applied to data processing apparatuses having various configurations other than executing data processing, such as a DVD (Digital Versatile Disc) player, a hard disk recorder, and a television receiver.

  In the first to third embodiments described above, the case where the data reversible processing apparatus according to the present invention is applied to the music providing servers 3, 65 and 85 described above with reference to FIGS. 1 to 29 has been described. However, the present invention is not limited to this, and the recording / reproducing devices 2, 61 and 81 having a data processing circuit, personal computers, mobile phones, PDAs, game machines, compact disc players, DVD players, hard disk recorders, television receivers, etc. As described above, the present invention can be widely applied to data reversible processing devices having various configurations in addition to performing data reversible processing that is reversible with the data processing executed by the data processing device.

  Furthermore, in the first to third embodiments described above, the data processing circuit according to the present invention is applied to the data processing circuits 19, 63 and 83 having the circuit board configuration described above with reference to FIGS. However, the present invention is not limited to this, and data processing such as encryption processing and decryption processing is executed using key data for various content data such as video data, photo image data, text data, and game programs. Data processing circuit for performing data processing such as signature generation processing for generating an electronic signature using key data and keyed hash value generation processing for generating a hash value by adding key data to predetermined data In addition, other types using key data such as a data processing circuit having a circuit board configuration that is detachably provided to the data processing device. It can be widely applied to a data processing circuit for executing the data processing.

  Further, in the first to third embodiments described above, the data reversible processing circuit according to the present invention is applied to the data processing circuits 45, 67 and 87 having the circuit board configuration described above with reference to FIGS. The present invention is not limited to this, but the present invention is not limited to this. Data reversible processing such as encryption processing and decryption processing using key data for various content data such as video data, photographic image data, text data, and game programs. A data reversible processing circuit that performs data reversal processing such as authentication processing for authenticating an electronic signature using key data and data tampering detection processing for detecting falsification of original data from a keyed hash value using key data. A data reversible processing circuit to be executed, and a data processing circuit having a circuit board configuration that is detachably attached to the data reversible processing device The data processing executed by the data processing circuit can be widely applied to the data reversible processing circuit of the other various configurations for performing lossless data lossless process.

  Further, in the first to third embodiments described above, the data processing control program according to the present invention is stored in advance in the memories 30 and 90 in the data processing circuits 19, 63 and 83 described above with reference to FIGS. However, the present invention is not limited to this, and the present invention is not limited to this, such as a data processing control program stored in advance in the ROM 14 or the hard disk drive 15 of the recording / reproducing devices 2, 61 and 81. As described above, various other data processing control programs can be widely applied. Incidentally, a program storage medium in which a data processing control program is stored may be installed in the recording / reproducing devices 2, 61 and 81 or the data processing circuits 19, 63 and 83.

  Further, in the first to third embodiments described above, the data reversible processing control program according to the present invention is stored in advance in the memories 46 and 75 in the data processing circuits 45, 67 and 87 described above with reference to FIGS. However, the present invention is not limited to this, and the present invention is not limited to this, and the data reversible processing control stored in advance in the ROM 41 or the hard disk drive 42 of the music providing servers 3, 65 and 85 is described. Various other data reversible processing control programs such as programs can be widely applied. Incidentally, a program storage medium in which a data reversible processing control program is stored may be installed in the music providing servers 3, 65 and 85 or the data processing circuits 45, 67 and 87.

  Further, in the first to third embodiments described above, FIGS. 1 to 29 have been described as the first data setting means for setting the program data of the first part of the data processing program as temporary key data. Although the case where the data setting units 32, 71, and 92 having the partial functions of the DSPs 31, 70, and 91 are applied has been described, the present invention is not limited to this, and the program data of the first part of the data processing program Various other first data processing means can be widely applied, such as a data setting circuit having a hardware circuit configuration for setting the key to temporary key data.

  Further, in the first to third embodiments described above, FIGS. 1 to 29 are described as the second data setting means for setting the program data of the second part of the data processing program as temporary processing target data. The case where the data setting units 32, 71, and 92 having the partial functions of the DSPs 31, 70, and 91 are applied has been described, but the present invention is not limited to this, and the program of the second part of the data processing program Various other second data setting means can be widely applied, such as a data setting circuit having a hardware circuit configuration for setting data as temporary processing target data.

  Further, in the first to third embodiments described above, as key data generating means for generating key data by data processing temporary data to be processed using temporary key data according to the data processing program, FIG. Thru | or FIG. 29, although the case where the key data generation parts 33 and 93 which consist of a part of DSP31, 70, and 91 mentioned above was applied was described, this invention is not limited to this, and it is temporary according to a data processing program. Various other key data generation means can be widely applied, such as a key data generation circuit having a hardware circuit configuration that generates key data by processing key processing target data using key data. .

  Further, in the first to third embodiments described above, the DSPs 31, 70 and 91 described above with reference to FIGS. 1 to 29 are used as data processing means for processing data to be processed using key data in accordance with the data processing program. Although the case where the codec processing units 34 and 94 having partial functions are applied has been described, the present invention is not limited to this, and a hardware circuit that processes data to be processed using key data according to a data processing program Various other data processing means can be widely applied, such as a codec processing circuit having a configuration.

  Further, in the first to third embodiments described above, the program data of the first part of the data processing program is used as temporary key data, and the program data of the second part of the data processing program is used as temporary processing. Data reversible that performs reversible data processing on input data, which is reversible with data processing, using key data generated by data processing of temporary processing target data using temporary key data according to a data processing program as target data The case where the DSP codec processing units 47, 76 and 88 in the data processing circuits 45, 67 and 87 described above with reference to FIGS. 1 to 29 are applied as the processing means has been described. Not limited to this, various other data reversible processing means such as a microprocessor or a codec processing unit having a CPU configuration. It can be widely applied.

  The present invention can be used in a data processing circuit provided in a data processing device such as a personal computer or a music playback device.

1 is a schematic diagram showing a first embodiment of the overall configuration of a recording / reproducing system according to the present invention. It is a block diagram which shows the circuit structure of a recording / reproducing apparatus. It is a block diagram which shows the structure of a data processing circuit. It is an approximate line figure used for explanation of generation of actual use key data. It is an approximate line figure used for explanation of impersonation of actual use key data. It is a basic diagram with which it uses for description of embedding actual use key data with respect to a decoding program. It is a flowchart which shows the 1st data processing control processing procedure. It is a flowchart which shows the 2nd data processing control processing procedure. It is a block diagram which shows the circuit structure of a music provision server. It is a flowchart which shows the 1st data reversible process control processing procedure. It is a basic diagram with which it uses for description of the other setting method with respect to temporary key data and temporary process target data. It is a basic diagram which shows the whole structure of the recording / reproducing system by 2nd Embodiment. It is a block diagram which shows the circuit structure of a recording / reproducing apparatus. It is a block diagram which shows the circuit structure of a music provision server. It is a block diagram which shows the structure of a data processing circuit. It is an approximate line figure used for explanation of generation of actual use key data. It is an approximate line figure used for explanation of setting of temporary key data and temporary processing object data. It is a basic diagram with which it uses for description of embedding actual use key data with respect to a decoding program. It is a flowchart which shows the 3rd data processing control processing procedure. It is a flowchart which shows a 4th data processing control processing procedure. It is a flowchart which shows the 2nd data reversible process control processing procedure. It is a basic diagram with which it uses for description of the other setting method with respect to temporary key data and temporary process target data. It is a basic diagram which shows the whole structure of the recording / reproducing system by 3rd Embodiment. It is a block diagram which shows the circuit structure of a recording / reproducing apparatus. It is a block diagram which shows the circuit structure of a music provision server. It is a basic diagram with which it uses for description of a sound quality degradation process. It is a block diagram which shows the structure of a data processing circuit. It is an approximate line figure used for explanation of generation of actual use key data. It is a flowchart which shows the 5th data processing control processing procedure.

Explanation of symbols

2, 61, 81... Recording / playback device, 3, 65, 85 .. music providing server, 19, 45, 63, 67, 83, 87... Data processing circuit, 30, 46, 75, 90. 31, 70, 91... DSP, 32, 71, 92... Data setting unit, 33, 93... Key data generation unit, 34, 47, 76, 88, 94... Codec processing unit, D1, D4, D10 , D12, D15, D18, D25, D26, D30 ... Temporary key data, D2, D5, D11, D13, D16, D19, D24, D27, D31 ... Temporary processing target data, D3, D6, D17, D20, D32 ... actual use key data, EP1 ... firmware decryption program, EP2 ... data decryption program, EP10 ... sound quality degradation program, FA1, FA2, FA3, FA4, FA1 , FA11, F20... First part, SA1, SA2, SA3, SA4, SA10, SA11, SA20... Second part, SA101, SA102, SA103, SA111, SA112, SA113... ... First data processing control processing procedure, RT2... Second data processing control processing procedure, RT3... First data reversible processing control processing procedure, RT4... Third data processing control processing procedure, RT5. ... Fourth data processing control processing procedure, RT6... Second data reversible processing control processing procedure, RT7... Fifth data processing control processing procedure.

Claims (20)

A data setting step of setting program data of the first part of the data processing program as temporary key data and setting program data of the second part of the data processing program as temporary processing target data;
A key data generation step of generating key data by data processing the temporary processing target data using the temporary key data according to the data processing program;
A data processing method comprising: a data processing step for processing the data to be processed using the key data in accordance with the data processing program. The data processing program is
It is a decryption program for executing decryption processing as the data processing,
The above data setting step
Setting the program data of the first part of the decryption program as the temporary key data, setting the program data of the second part of the decryption program as the temporary processing target data,
The key data generation step includes
The key data is generated by decrypting the temporary processing target data using the temporary key data according to the decryption program,
The data processing step is
The data processing method according to claim 1, wherein the encrypted data as the processing target data is decrypted using the key data in accordance with the decryption program. The data processing program is
It is an encryption program for executing encryption processing as the above data processing,
The above data setting step
The program data of the first part of the encryption program is set to the temporary key data, the program data of the second part of the encryption program is set to the temporary processing target data,
The key data generation step includes
The key data is generated by performing the encryption process on the temporary processing target data using the temporary key data according to the encryption program,
The data processing step is
The data processing method according to claim 1, wherein the encryption target data as the processing target data is encrypted using the key data in accordance with the encryption program. The above data setting step
The program data of the first part of the data processing program is set as the temporary key data, and the program data of the second part partially overlapping with the first part of the data processing program is set as the temporary data. The data processing method according to claim 1, wherein the data is set as processing target data. The above data setting step
Of the plurality of program data in the first part of the data processing program, the program data of the one part is set as the temporary key data, and the program data of the second part of the data processing program The data processing method according to claim 1, wherein the temporary processing target data is set. The above data setting step
Corresponding to the key identification information among the program data at the plurality of locations in the first part of the data processing program according to key identification information for identifying the key data used for the data processing of the processing target data. 6. The data processing method according to claim 5, wherein the program data of the one place to be set is set to the temporary key data. The above data setting step
The program data of the first part of the data processing program is set as the temporary key data, and the program data of the one part among the plurality of program data in the second part of the data processing program The data processing method according to claim 1, wherein the temporary processing target data is set. The above data setting step
Corresponding to the key identification information among the program data in the plurality of places in the second part of the data processing program according to key identification information for identifying the key data used for the data processing of the processing target data The data processing method according to claim 7, wherein the program data of the one place to be set is set as the temporary processing target data. The temporary data of the first part of the data processing program is used as temporary key data, and the program data of the second part of the data processing program is used as temporary processing target data. Data comprising a data reversible processing step that uses key data generated by data processing of the tentative processing target data to perform input data reversible processing that is reversible with the data processing. Reversible processing method. The data processing program is
It is a decryption program for executing decryption processing as the data processing,
The data reversible processing step includes
The temporary key according to the decryption program, with the program data of the first part of the decryption program as the temporary key data and the program data of the second part of the decryption program as the temporary processing target data The encryption target data as the input data is encrypted as the data reversible process by using the key data generated by performing the decryption process on the temporary process target data using data. The data reversible processing method according to claim 9. The data processing program is
It is an encryption program for executing encryption processing as the above data processing,
The data reversible processing step includes
The program data of the first part of the encryption program is used as the temporary key data, and the program data of the second part of the encryption program is used as the temporary processing target data according to the encryption program. Decrypting the encrypted data as the input data as the data reversible process using the key data generated by performing the encryption process on the temporary process target data using the temporary key data. The data reversible processing method according to claim 9, wherein the data is reversible. The data reversible processing step includes
The program data of the first part of the data processing program is used as the temporary key data, and the program data of the second part that partially overlaps the first part of the data processing program is used as the temporary process. Using the key data generated by subjecting the temporary processing target data to the data processing using the temporary key data according to the data processing program as the target data, and reversibly processing the input data. The data reversible processing method according to claim 9. The data reversible processing step includes
Of the plurality of program data in the first part of the data processing program, the program data of the one part is used as the temporary key data, and the program data of the second part of the data processing program is used. As the temporary processing target data, the key data generated by data processing the temporary processing target data using the temporary key data according to the data processing program, the input data is converted to the data The data reversible processing method according to claim 9, wherein reversible processing is performed. The data reversible processing step includes
The program data of the first part of the data processing program is used as the temporary key data, and the program data of the one part among the program data of a plurality of parts in the second part of the data processing program is used. As the temporary processing target data, the key data generated by data processing the temporary processing target data using the temporary key data according to the data processing program, the input data is converted to the data The data reversible processing method according to claim 9, wherein reversible processing is performed. First data setting means for setting program data of the first portion of the data processing program as temporary key data, and second of setting program data of the second portion of the data processing program as temporary processing target data Data setting means, key data generating means for generating key data by data processing the temporary processing target data using the temporary key data according to the data processing program, and the key data according to the data processing program A data processing apparatus comprising: a data processing circuit having a data processing means for processing the data to be processed using the data processing unit. The temporary data of the first part of the data processing program is used as temporary key data, and the program data of the second part of the data processing program is used as temporary processing target data. A data reversible processing circuit having a data reversible processing means for performing reversible data reversal on the input data using the key data generated by processing the temporary processing target data using the data; A data reversible processing apparatus. First data setting means for setting the program data of the first part of the data processing program as temporary key data;
Second data setting means for setting the program data of the second part of the data processing program as temporary processing target data;
Key data generating means for generating key data by data processing the temporary processing target data using the temporary key data in accordance with the data processing program;
A data processing circuit comprising: data processing means for processing the data to be processed using the key data in accordance with the data processing program. The temporary data of the first part of the data processing program is used as temporary key data, and the program data of the second part of the data processing program is used as temporary processing target data. Data comprising: a data reversible processing means for performing reversible data reversal on the input data using the key data generated by processing the temporary processing target data using the data Reversible processing circuit. For data processing circuit
A data setting step of setting program data of the first part of the data processing program as temporary key data and setting program data of the second part of the data processing program as temporary processing target data;
A key data generation step of generating key data by data processing the temporary processing target data using the temporary key data according to the data processing program;
A data processing control program for executing the data processing step for processing the data to be processed using the key data according to the data processing program. For data reversible processing circuit
The temporary data of the first part of the data processing program is used as temporary key data, and the program data of the second part of the data processing program is used as temporary processing target data. Data reversible processing control for executing a data reversible processing step of performing reversible data reversible on the input data using the key data generated by processing the temporary processing target data using the data program.

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