JP5094690B2 - Recording control method - Google Patents

Description

  The technical field relates to content copy control.

  Regarding the above technical field, Patent Document 1 states that “use of information when copying one generation (Copy One Generation) is rewritten to information prohibiting further copying (Copy No More) and recorded. As a means to solve the problem, “Copy one generation is allowed within a predetermined time after recording (Copy One Generation). In addition, it is described that two identical streams are recorded on the medium, one is used for normal viewing, and the other is moved to another medium and stored as necessary. .

JP 2002-319227 A

  In recent years, recording apparatuses capable of recording digital broadcasts have become widespread with the expansion of digital broadcast services.

  When recording a digital broadcast, the received digital broadcast is recorded on an HDD (hard disk drive) built in the recording device, and the digital broadcast program is recorded from the HDD to another recording medium (for example, an optical disk, a semiconductor memory, or another HDD). Copy is permitted when Copy is Free (Copy Free), and digital broadcast programs are permitted to be recorded for one generation (meaning that copying of copies (two or more copies) is not permitted, Copy One Generation) is Move. (Moved).

  In the recording apparatus of Patent Document 1, even when the digital broadcast program is Copy One Generation, copying can be performed within a specified time, so that it is possible to compensate for the interruption of recording.

  However, in the recording apparatus of Patent Document 1, copying is not allowed as in the conventional case if the specified time has passed. For example, in a recording device that cannot simultaneously record a program to the HDD and copy from the HDD to the optical disk, if the program to be recorded is embedded and access to the HDD is concentrated, the copying from the HDD to the optical disk is completed. It is conceivable that the specified time will pass while you cannot.

  Therefore, when recording a digital broadcast program, there is provided an apparatus or method for improving usability while performing copy control.

Specifically, for example, digital content transmitted from the first recording device and a plurality of types of copy control information for controlling copying of the digital content are received, and the digital content is transferred to the second recording device according to the copy control information. A copy control method for copying,
When the first information of the received copy control information indicates that only one generation can be copied,
When the second information in the received copy control information indicates that the third information is valid,
The third information of the received copy control information indicates the number of copies permitted, and the digital recording of the digital content can be recorded and managed in the second recording device up to the number of copies permitted.
When the second information in the received copy control information indicates that the third information is invalid, copy of the digital content is prohibited and only one is recorded in the second recording device. Make it possible.

  According to the above means, when recording a digital broadcast program, it is possible to improve the usability of the recorded content while performing copy control.

  Hereinafter, examples (examples) of the preferred embodiments of the present invention will be described. However, the present invention is not limited to this embodiment. The present embodiment mainly relates to handling of information that is permitted to be copied by one generation.

<System>
FIG. 1 is a block diagram illustrating a configuration example of a system according to the present embodiment. The case where information is transmitted / received by broadcast and recorded / reproduced is illustrated.

  1 is a transmitter installed in an information providing station such as a broadcast station, 2 is a relay device installed in a relay station or a broadcasting satellite, 3 is a receiver installed in a user's house, and 10 is a receiver 3 This is a reception recording / reproducing unit built in. The reception recording / reproducing unit 10 can record and reproduce the broadcast information.

  The transmission device 1 transmits the modulated signal radio wave via the relay device 2. As shown in the figure, in addition to transmission by satellite, for example, transmission by cable, transmission by telephone line, transmission by terrestrial broadcasting, transmission using IP (Internet Protocol) via a network such as the Internet can also be used. As will be described later, the signal radio wave received by the receiving device 3 is demodulated into an information signal, and then recorded as a signal suitable for recording as necessary. Further, the user can view the video and audio indicated by the information signal by connecting the receiving device 3 to a display (not shown) when the receiving device 3 has a built-in display, or connecting the receiving device 3 to a display (not shown). Can do.

<Transmitter>
FIG. 2 is a block diagram illustrating a configuration example of the transmission device 1 in the system of FIG.

  Reference numeral 11 denotes a source generation unit, 12 denotes an encoding unit that performs compression using MPEG or H.264, 13 denotes a scrambling unit, 14 denotes a modulation unit, 15 denotes a transmission antenna, and 16 denotes a management information addition unit. Information such as video and audio generated by the source generation unit 11 including a camera and a recording / playback device is compressed by the encoding unit 12 so that it can be transmitted in a smaller occupied band. If necessary, the scrambler 13 performs transmission encryption so that a specific viewer can view. The signal is modulated as a signal suitable for transmission such as OFDM, TC8PSK, and QPSK by the modulation unit 14 and then transmitted as a radio wave from the transmission antenna 15 toward the relay device 2. At this time, the management information adding unit 16 adds information such as copy control information and current time, which is information for controlling copying.

  In many cases, a plurality of pieces of information are multiplexed in one radio wave by a method such as time division or spread spectrum. Although not shown in FIG. 2 for simplicity, in this case, there are a plurality of systems of the source generation unit 11 and the encoding unit 12, and a multiplex for multiplexing a plurality of pieces of information between the encoding unit 12 and the scramble unit 13. Part (multiplexing part) is placed.

<Copy control information>
The copy control information is information for controlling restrictions such as whether or not copying is allowed and the number of times of copying, and is added by the management information adding unit 16, for example. Includes content usage descriptor and digital copy control descriptor.

  FIG. 8 shows an example of operation related to protection of program content by using copy control information.

  “Operation possible” indicates that the transmission side can select a generation restriction using digital copy control information for content corresponding to each service form. For example, “pay-per-view” indicates that any digital copy control information may be used. On the other hand, “pay-per-view pay broadcasting” indicates “copy prohibited” on the transmission side. Indicates that it cannot be selected.

  “Flat / Tier” refers to contracting a plurality of channels together for pay broadcasting or the like as a flat contract, and contracting for each channel as a tier contract.

  “Other than the above” includes, for example, “in the case of a program that is not a pay broadcast and does not involve content protection”.

  FIG. 3 shows an example of the structure of a content usage descriptor that is one piece of copy control information. The content usage descriptor is generated and added by, for example, the management information adding unit 16, and PSI (Program Specific Information) (eg, PMT (Program Map Table)) of MPEG-TS or SI (Service Information) (eg, EIT (example) Event Information Table) or SDT (Service Description Table).

  The usage of the content usage descriptor is arranged (transmitted) when describing control information related to storage (recording) and output for the program. This means that if the 1-bit field of digital_recording_control_mode (digital copy mode bit) is “1”, even if the digital_recording_control_data of the digital copy control descriptor described in FIG. This indicates that recording is possible as "Copyable". In the case of “0”, it cannot be recorded as “Number Limited Copy Allowed”.

  The content usage descriptor is always arranged (sent) when the program is a target of output protection. This output protection means that protection is performed for the high-speed digital interface output of the content that can be copied without restriction using the output protection bit (encryption_mode) of the content usage descriptor. In other words, although it is encrypted when output via a digital interface or when copying to a recording medium, it does not limit the number of copies or generations. Retransmission to the Internet is virtually impossible. Also called “copy free with output protection” or EPN (encryption plus non-assertion).

  Further, it is always arranged (sent) when the digital copy control information of the program is “one-generation copy is permitted” and is not a target of “number-limited copy is permitted”.

  FIG. 4 shows an example of description contents in each field of the content usage descriptor.

  In “descriptor_tag”, “0xDE” indicating a content use descriptor is described. In “descriptor_length”, the descriptor length of the content use descriptor is described. In “digital_recording_control_mode”, “0” is described when the digital copy control information is “one generation copy is permitted” and is not a target of “number limited copy is possible”. If the digital copy control information is “one-generation copy is permitted” and the target is “number-limited copy is permitted”, “1” is described.

  In “encryption_mode”, “0” is described when the digital copy control information is “copying possible without restriction” and the high-speed digital interface output is protected.

  “Retention_mode” means temporary storage control bit, and “0” is written to indicate that temporary storage is possible even if “digital_recording_control_data” (digital copy control information) in the digital copy control descriptor is “copy prohibited” To do. “Retention_state” means a temporary storage allowable time, and describes “111” indicating that storage for 1 hour 30 minutes is possible. Note that “image_constraint_token”, “retention_state”, and “encryption_mode” are “1” in the default state.

The limitation on the number of copies of content with “number limited copy allowed” is that the total number of copies including the copy source and the copy destination is limited to 10 or less. In addition, when there is a recording function to a removable recording medium or a move function via a high-speed digital interface output, it is limited including them. Specifically, for example, it is assumed that the copy source content and the copy destination content are restricted in copy number or copy prohibition (re-copy prohibition) except for analog video, audio output, and digital audio output, respectively. If it is within the above restrictions, the content of the copy source or copy destination may be moved.
It should be noted that items used only for content management purposes, such as thumbnails, are not included in the copy.

  Each field will be described later with reference to FIG.

  FIG. 5 shows an example of the structure of a digital copy control descriptor that is one piece of copy control information. The digital copy control descriptor is information generated and added by, for example, the management information adding unit 16 and stored and transmitted in PSI (eg, PMT) or SI (eg, EIT or SDT). is there.

  The digital copy control descriptor represents information for controlling the copy generation by a 2-bit field of “digital_recording_control_data” (digital copy control information).

  FIG. 6 shows an example of digital copy control information. When the digital copy control information is “00”, it indicates that copying is possible without restriction, when it is “01”, it indicates that it is defined by the broadcaster, and when it is “10”, it is one generation copy. “11” indicates that copying is prohibited. Note that “1st generation copying is possible” means that the received broadcast signal can be recorded (first generation copy), but the broadcast signal cannot be copied (copied) after recording.

  The content use descriptors in FIGS. 3 and 4 are also called copy number restriction information, and the digital copy control information in FIGS. 5 and 6 is also called copy generation restriction information.

<Receiving device>
FIG. 10 is a block diagram illustrating a configuration example of the receiving device 3 in the system of FIG. In FIG. 10, it is assumed that a place where lines representing flows of information, PCR and the like intersect is not in contact. However, the portion marked with a black circle is in contact and indicates that it has branched from there.

  The receiving device 3 is a receiving device that receives a digital broadcast or an IP (Internet Protocol) broadcast via a network, and performs recording and reproduction. A case will be described in which a signal encoded by the Moving Picture Experts Group (MPEG) system and multiplexed by the MPEG2-TS system is handled as an image compression technique.

  The receiving device 3 includes a reception recording / reproducing unit 10, a control unit 114 (for example, a CPU (Central Processing Unit)), and a user interface unit 115 (for example, a keyboard, a mouse, or a remote controller as an input device).

  In this configuration example, each is described as a hardware element, but a part may be realized by software. Further, the present invention may be applied to transmission / reception of video content, audio content, and the like to a specific user such as VOD (Video On Demand) or download via a network. These are collectively called distribution.

  The control unit 114 is connected to each unit (including the reception recording / reproducing unit 10) of the reception device via a bus unit, and controls the operation of the entire reception device. In addition, various processing signals are received by receiving various command signals from the user via the remote control of the user interface unit 115 and controlling each unit connected via the bus unit based on the command signals.

  The reception recording / reproducing unit 10 includes a tuner decoding unit 101, a selector 102, a separation / extraction unit 103 (for example, a demultiplexer), an input buffer 104, a decoding unit 105 (for example, an MPEG decoder), a network interface unit 106, and a buffer management unit 107. , Clock reproduction unit 108, time stamp comparison / output unit 109, time stamp addition unit 110, reading unit 111, writing unit 112, built-in recording medium 113, output unit 116, fixed clock generation unit 117 (for example, crystal oscillator), content A management information creation unit 119 and a content management information analysis unit 120 are included.

  The built-in recording medium 113 (also referred to as a first recording medium) and the removable recording medium 118 (also referred to as a second recording medium) are random access such as a hard disk drive (HDD), a semiconductor memory, a magnetic disk, an optical disk, and a magneto-optical disk. Is a possible medium.

  The output unit 116 is a display unit using a CRT (Cathode Ray Tube), an LCD (Liquid Crystal Display), a PDP (Plasma DISPLAY Panel), an audio output unit such as a speaker, or other analog or digital display devices. Composite video output terminal that outputs video data / audio data, S video output terminal (S terminal), D video output terminal (D terminal) (analog video output terminal), HDMI (High Definition Multimedia Interface) output terminal (digital video) Output terminal), optical audio output terminal (digital audio output terminal), and the like. The output unit 116 reproduces the decoded video / audio on the display unit / audio output unit which is an output device. Alternatively, video / audio content data or the like is output to another display device, audio reproduction device, or the like via an output terminal (for example, HDMI). Since the video / audio content data from the output terminal is output in a format based on the content protection method of each output standard, the content is protected.

  The tuner decoding unit 101 receives a digital broadcast signal transmitted from the transmission device 1 via a broadcast transmission network such as a radio (satellite, terrestrial) or cable. Channel selection and detection processing are performed on the frequency of a physical or virtual channel designated via a user operation unit such as a remote controller of the user interface unit 115 and the control unit 114. Also, the MPEG2-TS (transport stream) after digital demodulation and error correction processing is output to the selector 102.

  The selector 102 performs a 3-input 1-output selection process in accordance with control from the control unit 114, and outputs the output to the separation / extraction unit 103.

  The separation / extraction unit 103 separates / extracts the transport packet of the channel (program) designated via the user operation unit such as a remote controller of the user interface unit 115 and the control unit 114 from the input MPEG2-TS, The separated / extracted transport packet is output to the time stamp adding unit 110 and the network interface unit 106. Also, the separation / extraction unit 103 is a video and audio PES (Packetized Elementary Stream) from a transport packet of a channel (program) designated via a user operation unit such as a remote controller of the user interface unit 115 and the control unit 114. Alternatively, ES (Elementary Stream) is separated and extracted and output to the input buffer 104.

  The ES is compressed / encoded image / audio data, and the PES is a packet obtained by dividing the image ES or audio ES into appropriate sizes. Further, the separation / extraction unit 103 extracts a PCR (Program Clock Reference) from a transport packet of a channel (program) designated via the user operation unit such as a remote controller of the user interface unit 115 and the control unit 114, The data is output to the clock reproduction unit 108.

  The separation / extraction unit 103 records on a built-in recording medium 113 or a removable recording medium 118 from a transport packet of a channel (program) designated via a user operation unit such as a remote controller of the user interface unit 115 and the control unit 114. Channel title (program) title, start / end date / time of the program, copy generation control information and information indicating whether or not multiple copies are possible are detected, and an encryption key for the data is created, and the contents management information creation unit 119 is sent. Output. The title, the start / end date / time of the program, the copy generation control information and the information indicating whether or not a plurality of copies can be made are stored in, for example, MPEG-TS PSI or SI information and transmitted from the transmission apparatus 1.

  The input buffer 104 temporarily stores the video / audio PES or ES from the separation / extraction unit 103. The decoding unit 105 compares the DTS (Decoding Time Stamp) / PTS (Presentation Time Stamp) corresponding to the PES or ES stored in the input buffer 104 with the STC (System Time Clock) count value from the clock reproduction unit 108. By taking the decoding / display timing, the video / audio PES or ES stored in the input buffer 104 is extracted and decoded, and the decoded video / audio is output to the output unit 116.

  The buffer management unit 107 monitors the amount of unprocessed transport packets by the decoding unit 105 in the input buffer 104, and controls the reading start and stop of the reading unit 111 according to the amount.

  The clock recovery unit 108 uses PCR to reproduce, for example, the system clock of the receiver whose frequency matches the system clock of the encoding / multiplexing unit (not shown) on the transmitting apparatus 1 side. The reproduced system clock is output to the STC counter in the clock recovery unit 108, the time stamp addition unit 110, and the like. In addition, the STC count value of the STC counter that operates based on the reproduced system clock is output to the decoding unit 105.

  The time stamp adding unit 110 generates a time stamp by a counter that operates based on, for example, a system clock reproduced by the clock reproducing unit 108 or a crystal oscillator (not shown), and is separated and extracted by the separation / extraction unit 103. A time stamp is added to each transport packet and output to the writing unit 112.

  FIG. 11 shows an example of the structure of a transport packet to which a time stamp is added. A transport packet (TSP) with a length of 188 bytes according to the MPEG standard has a 4-byte time stamp (for example, the time when the receiver receives the transport packet) added to the beginning, and a packet with a length of 192 bytes Become. The time stamp holds time stamp information when the transport packet arrives. The MPEG standard TS is composed of a header of the first 4 bytes, followed by a payload of 184 bytes (or an adaptation field).

  A content management information creation unit (content information creation unit) 119 includes a title from the separation / extraction unit 103, a start / end date / time of a program, copy generation control information and copy number control information (indicating whether multiple copies are possible), Management information is created based on the key information and output to the writing unit 112. The copy generation control information and the copy number control information may be received from the transmitter 1 as the content use descriptor and the digital copy control descriptor described with reference to FIGS. May be created as new information.

  The writing unit 112 performs an encryption process on the management information created by the content management information creating unit 119 and the transport packet with the time stamp added by the time stamp adding unit 110 based on the key information in the management information. The encrypted data subjected to the processing is recorded on the built-in recording medium 113 or the removable recording medium 118. As a result, the transport packet to which a plurality of time stamps including video / audio data of a certain channel (in other words, a certain program content and downloaded content) is added is subjected to encryption processing. One stream having encrypted data is stored in the internal recording medium 113 or the removable recording medium 118 as one data file or two or more fragment data files obtained by dividing the data file.

  The time stamp can also be said to be time information related to the temporal position of the transport packet to which the stamp is attached. For example, the time when the transport packet from the separation / extraction unit 103 is input to the time stamp adding unit 110, or a certain transport packet (for example, the immediately preceding or first transport packet) It can also be said that this is a time difference. As described above, this time stamp is different from a time stamp (for example, PCR, DTS, or PTS) included in advance in the transport packet.

  FIG. 12 shows an example in which program content is recorded on the internal recording medium 113 or the removable recording medium 118.

  For each program content, management information indicating the contents of the program content and data (video / audio) that is the substance of the program content are recorded in the management information area 501 and the data area 502, respectively. The management information includes, for example, a file number 503 indicating the title of the program content, a date 504 indicating the start / end date and time of the program, a data area start address and recording size 505, copy information 507, copy number 508, key information 506, and the like. Record. In the data area 502, program contents are written from an address corresponding to the head address 505 recorded in the management information area 501. Each time program content is newly recorded, file number 1, file number 2,..., File number n, management information, and program content are sequentially recorded.

The copy information 507 is copy generation control information included in the management information created by the content management information creation unit 119. For example, the copy information 507 is a 2-bit signal,
00 = Copy Free
10 = Allow one generation of recording (Copy One Generation)
11 = Copy Never
Such a designation is conceivable. In this case, it is defined that the program content recorded with “Copy One Generation” in the receiving device 3 cannot be copied any more than 01 = Copy One Generation (No More Copies). The designation method may be the same operation as that of the digital copy control information described with reference to FIG.

  The copy number 508 is copy number control information included in the management information created by the content management information creation unit 119. The number of copies 508 is information created by the content management information creation unit 119 based on the copy generation control information received from the separation / extraction unit 103 and information indicating whether or not multiple copies are possible. If the copy generation control information permits one-generation recording (Copy One Generation) and the information indicating whether or not multiple copies are possible is “possible”, the program content is recorded as “No More Copies”, and the same or different recording medium In the same or different format, information indicating the number of permitted copies for enabling copying is stored, and for example, “9” indicating the meaning of permitting nine copies is input. This numerical value should conform to a standard or the like. On the other hand, if the copy generation control information permits one-generation recording (Copy One Generation) and the information indicating whether or not multiple copies are possible is “No”, the program content is recorded as “No More Copies”, indicating that copying is not possible. "0" (indicating that copying is not permitted) is input as information indicating the permitted number of copies for copying.

  Note that the copy generation that is stored in the PSI or SI of the MPEG-TS and transmitted from the transmission apparatus 1 is the actual data of the program content in which the program content of “Copy One Generation” is recorded as “No More Copies”. The control information and information indicating whether or not multiple copies are possible are not changed.

  The copy information 507, the copy number 508, and the key information 506 are encrypted, for example, so as not to be tampered with.

  Returning to the description of FIG. 10, the content management information analysis unit 120 reads the management information stored in the internal recording medium 113 or the removable recording medium 118 via the reading unit 111, analyzes the content of the management information, and When reproducing, copying, or moving the program content stored in the recording medium 113 or the removable recording medium 118, the program content can be selected via the user operation unit such as a remote controller of the user interface unit 115 and the control unit 114. The title of the program content, the start / end date / time of the program, the copy information, the number of copies, and the like are passed to the control unit 114 so that they can be performed. Also, key information for decrypting the encrypted data is passed to the reading unit 111.

  The reading unit 111 is controlled via the buffer management unit 107 or the control unit 114, reads management information from the built-in recording medium 113 or the removable recording medium 118, outputs the management information to the content management information analysis unit 120, and incorporates encrypted data A transport packet, which is read one after another from the recording medium 113 or the removable recording medium 118, and appended with a time stamp obtained by decrypting the encrypted data based on the key information passed from the content management information analysis unit 120, The data is output to the time stamp comparison / output unit 109.

  The time stamp comparison / output unit 109 includes a counter value of a counter that operates based on a fixed clock recovery unit 117 such as a crystal oscillator, and a time stamp of a transport packet to which the time stamp read by the reading unit 111 is added. If they match, the time stamp is deleted (removed) from the transport packet and output to the selector 102 and the network interface unit 106. As described above, when the remaining amount of the input buffer 104 is monitored by the buffer management unit 107 and the reading unit 111 is controlled according to the amount, the transport is performed without comparing the counter value with the time stamp. The time stamp may be deleted from the packet and output to the selector 102 and the network interface unit 106. In particular, it is preferable to output by this method at the time of reproduction other than normal reproduction (single speed reproduction).

  The network interface unit 106 is connected to another device (recorder, display, personal computer, or server outside the home) that is the output destination / input source via a line (IEEE1394 cable, LAN cable, wireless, etc.). Connected. Then, a transport packet such as video / audio from which the time stamp has been deleted by the time stamp comparison / output unit 109 or a transport packet that has been separated / extracted by the separation / extraction unit 103 is received, and these transport packets are Video / audio data stored in the built-in recording medium 113 and the removable recording medium 118 or received by the tuner decoding unit 101 to another device as an output destination after being converted into a format conforming to each transmission standard via a line Outputs video / audio data of digital broadcast signals. Also, data such as video / audio is input from another device as an input source via a line in a format according to each transmission standard, converted into a transport packet, and output to the selector 102. Note that there may be a plurality of network interface units 106.

<Reception and recording processing related to copy control information>
A detailed example of processing of the receiving apparatus 3 related to the copy control information described with reference to FIGS. 3 to 6 sent from the transmitting apparatus 1 will be described.

  FIG. 7 shows an example of processing for each field of the content usage descriptor in the receiving apparatus 3.

  If “descriptor_tag” is “0xDE”, it is determined that the descriptor is a content use descriptor. Based on “descriptor_length”, it is determined as the descriptor length of the content use descriptor. If “digital_recording_control_mode” is “1”, if the digital copy control information is “one-generation copy is permitted”, it is determined that the number of copies is permitted. If it is “0”, if the digital copy control information is “one-generation copy is permitted”, it is determined that the number of copies is not permitted. With regard to “image_constraint_token”, it is determined that the resolution of the video signal output is not limited no matter what value is entered. Regarding “retention_mode”, it is determined that temporary storage is possible regardless of any value. Regarding “retention_state”, it is determined that the temporary storage allowable time is 1 hour 30 minutes regardless of any value. If “encryption_mode” is “1”, it is determined that the high-speed digital interface output is not protected when the digital copy control information is “Copyable without constraint”. If it is “0”, if the digital copy control information is “copying possible without restriction”, it is determined that the high-speed digital interface output is protected.

  In addition, when a content utilization descriptor is not arrange | positioned (sent) for some reason, it is good to interpret each field as the following values. digital_recording_control_mode = '1', image_constraint_token = '1', retention_mode = '0', retention_state = '111', encryption_mode = '1'.

  FIG. 9 shows an example of control in which the receiving device 3 stores (records) program content using copy control information.

  For example, when program content is stored, if digital_recording_control_data of the digital copy control descriptor is “10” and “one-generation copying is possible”, the content shown in FIG. Accumulate as "copy prohibited". However, when digital_recording_control_mode is “1”, it is stored as “number limited copy allowed”. Even when accumulation is performed with “recopy prohibited”, the value of digital_recording_control_data in the digital copy control descriptor does not need to be changed.

  If digital_recording_control_data of the digital copy control descriptor is “10” and “one-generation copying is possible”, a plurality of copies must not be generated. However, storage in areas where the user cannot access for backup purposes is excluded. In addition, the above restriction is imposed on each broadcast reception unit, and when there are a plurality of broadcast reception units, the above restriction is imposed on each broadcast reception unit.

  Regarding the number-limited copy permitted, N copies can be generated from the program content stored as “number-limited copy permitted”. The value of N may be based on a standard, for example. When a copy is generated via the high-speed digital interface output, the copy may be performed when the number of copies to be generated can be determined by using a move function or the like. For example, it can be recognized that the interface is IEEE 1394 and the output destination is a device compatible with the DTCP standard. The generated copy is set to “recopy prohibited” or an equivalent state.

  Also, when reproducing and outputting program content stored as “Number Limited Copy Allowed”, the high-speed digital interface performs output of No More Copies defined in DTCP (Digital Transmission Content Protection). . The analog video output and digital audio output can be output as “one generation copy permitted”.

  The limitation on the number of copies of content with “number limited copy allowed” is that the total number of copies including the copy source and the copy destination is limited to 10 or less. In addition, when there is a recording function to a removable recording medium or a move function via a high-speed digital interface output, it is limited including them. Specifically, for example, it is assumed that the copy source content and the copy destination content are restricted in copy number or copy prohibition (re-copy prohibition) except for analog video, audio output, and digital audio output, respectively. If it is within the above restrictions, the content of the copy source or copy destination may be moved.

  Regarding the content recorded (accumulated) as “Number Limited Copy Allowed”, the digital recording (copying) to the recording medium and the copy via the high-speed digital interface output are the original content recorded (accumulated). In addition, up to 9 copies can be generated. However, recording (accumulation) in an area that cannot be accessed by the user for backup purposes during and after recording is excluded. The original content after the prescribed number (9) of copies are generated can be moved in the same manner as the “recopy prohibited” content.

  In addition, it is possible to move the content managed as “Number Limited Copy Allowed” while maintaining the number of copies managed in the recording medium that is built-in or digitally connected. And keep the total number of copies unchanged after the move.

  The management of the number of copies when copying “Number Limited Copy Allowed” content to a built-in recording medium and copying via a high-speed digital interface is equivalent to the case where there are 10 contents that can be moved. In addition, analog video output and digital audio output can be output by “copying only for one generation” and are not included in the limitation of the number of copies.

As for the recording on the removable recording medium, the content can be recorded in the state of “number limited copying is possible” as long as the same number of copies as described above can be managed. However, when content is recorded simultaneously on a removable recording medium and a storage medium, or a plurality of removable recording media, the total number of copies allowed by each of the plurality of removable recording media and the storage medium is the reception of one broadcast. Share and manage so that it does not exceed each department.
“Move with the number-limited copy allowed” content holding the number of copies of content means to move all or a part of the number of copies managed by the move source. In this case, make sure that the total number of copies does not change before and after the move. Specifically, when the number of copyable contents before the move is m and n of the contents are moved, the number of copyable contents at the move source is (mn), and the content at the move destination The number of copies that can be copied is (n-1)
It should be noted that items used only for content management purposes, such as thumbnails, are not included in the copy. What is used for the purpose of content management may be, for example, audio information or subtitle information other than thumbnails created from video information.

  FIG. 18 is a diagram for understanding the limitation on the number of copies described above, and shows the receiving device 3, the network interface unit 106, the built-in recording medium 113, the removable recording medium 118, the recording device 121, and the recording device 122. The recording device 121 is connected to the network interface unit 106 via IEEE1394, for example, and DTCP is used as a copyright protection method. The recording device 122 is connected to, for example, the network interface unit 106 via a wired LAN or a wireless LAN, and DTCP-IP (Digital Transmission Content Protection over Internet Protocol) is used as a copyright protection method. For example, in the case of such a connection, the total number of “Number Limited Copy Allowed” content received from the broadcast wave is within 10 in the internal recording medium 113, the removable recording medium 118, the recording device 121, and the recording device 122. There must be.

  In this case, for example, four contents can be copied to the internal recording medium 113, two contents can be copied to the removable recording medium 118, one content is stored in the recording apparatus 121, and one content is stored in the recording apparatus 122. Is one piece of content. When a broadcast wave is received and recorded, it may be recorded on the built-in recording medium 113, the removable recording medium 118, the recording device 121, and the recording device 122 at the same time so as to have the above-mentioned number, or initially the built-in recording medium The data may be recorded only on 113, and then copied to the removable recording medium 118, the recording device 121, and the recording device 122.

  FIG. 19 is a diagram for understanding the substitute output destination of the content accumulated by the above-described “number limited copy permitted” and its copy control. As an output source, for example, the built-in recording medium 113 of the reception recording / reproducing unit 10 is used. However, analog video output (composite video output terminal, S terminal, D terminal, etc.) in the output unit 116 uses CGMS-A (Copy Generation Management System-Analog) and Macrovision as copy control, and CGMS -A control can be copied only for one generation, and Macrovision control inherits the value of APS (Analog Protection System). For digital audio output (optical audio output terminal, etc.), SCMS (Serial Copy Management System) is used as copy control. Further, the high-speed digital interface (IEEE 1394 terminal or the like) in the network interface unit 106 uses DTCP (Digital Transmission Content Protection) as copy control, and the control is “No more copies” during reproduction, and “Move” when copying. To do. In the removable recording medium 118, copy control prohibiting recopying is performed at the recording destination.

  By performing appropriate copy control according to different output destinations in this way, the same program can be recorded on a plurality of recording media or recording devices when receiving and recording broadcast waves, and the user can There is an effect of protecting contents while aiming at convenience.

  The recording apparatuses 121 and 122 have been described as being connected via IEEE 1394 and LAN, respectively, but are not necessarily limited to IEEE 1394 and LAN, and may be connected by other connection methods.

  As described above, when moving content managed as “Number Limited Copy Allowed” while maintaining the number of copies managed on a digitally connected recording medium, the total number of copies before and after the move An example of the method will be described. When a TS packet is transmitted by DTCP-IP, a DTCP_descriptor including content copy control information is set in the PMT. FIG. 20 is a diagram illustrating an example of the DTCP_descriptor. DTCP_descriptor is a retention_move_mode that indicates whether a temporary accumulation or movement mode of a digital stream is defined, a retention_state that indicates a period of temporary accumulation, and a DTCP_CCI (DTCP_Copy Control that indicates whether or not copying of an MPEG2-TS format digital stream is permitted. Information), when DTCP_CCI indicates copy free, EPN indicating whether the copy free is EPN Asserted copy free, Count indicating the number of copies allowed, and whether Count information is valid Copy_count_Mode, Image_Constraint_Token indicating that the resolution is limited when reproducing and outputting a digital stream in the MPEG2-TS format, whether to protect the analog output when converting the digital stream in the MPEG2-TS format after analog conversion Includes APS (Analogue Protection System) indicatingAs described above, the DTCP_descriptor is transmitted after the DTCP_descriptor is set in the PMT and stored in the TS packet. However, when transmitting contents other than MPEG2-TS, such as MPEG2-PS, the DTCP-descriptor conforms to the DTCP-IP standard. The content data copy control information may be stored in a packet added as a packet different from the defined transmission content. Of course, when MPEG2-TS is transmitted, copy control information of content data may be stored in a packet different from the transmitted content.

  By using such Copy_count_Mode and Count information on the content transmission side and the reception side, appropriate copy control is performed, so that content managed as “number limited copy is possible” is digitally transmitted via a wired / wireless LAN or the like. It is possible to move while maintaining the number of copies managed when recording on a connected recording medium, and there is an effect of protecting contents while improving user convenience. In other words, DTCP-IP can be used to move content while maintaining the number of copies managed when recording content managed as “Number Limited Copy Allowed” on a digitally connected recording medium such as wired / wireless LAN. It is necessary to use information of Copy_count_Mode and Count, which is an extension of the standard. In the above description, Count indicating the number of copies permitted and Copy_count_Mode indicating whether the information of Count is valid or not, but only Count indicating the number of copies permitted without using Copy_count_Mode can be dealt with without any problem.

  When the recording medium is a removable recording medium, there is another limitation in addition to FIG. For digital recording of program content to a removable recording medium, digital_recording_control_data of the digital copy control descriptor is “10” and “one generation can be copied” in TV, data service digital recording, or audio service digital recording. When receiving and recording content, even if it is the first generation of the received content, 3 or more copies are not allowed (for example, when 3 or more recording media are received simultaneously when receiving and recording a broadcast) Do not record). This value (three or more examples) may be based on a standard, for example. In addition, a plurality of one-generation copies having the same recording format are not generated. However, digital recording to an area that the user cannot access for backup purposes is excluded. In addition, the restriction on recording on a digital recording medium is imposed on each broadcast reception unit. When there are a plurality of broadcast reception units, the above restriction is imposed on each broadcast reception unit. If the receiving device has a recording method that does not support digital_recording_control_mode, the program content whose copy_control_type in the digital copy control descriptor is '01' and digital_recording_control_data is '10' is affected by the value of digital_recording_control_mode in the content usage descriptor. First of all, digital recording is performed in the manner of "one generation copy is possible".

  FIG. 13 is a flowchart illustrating an example of a procedure for creating copy information and the number of copies of management information in the case where program content for which one-generation copying is permitted (Copy One Generation) is recorded in the receiving device 3.

  Based on the copy generation control information from the separation / extraction unit 103 and the information indicating whether or not multiple copies are possible, the content management information creation unit 119 determines whether or not multiple copies can be made with “Copy One Generation permitted”. If it is recognized that the program content is added with the indicated information, “01” is input to the copy information of the management information as no more copying, that is, “No More Copies” (SA01).

  For example, the control unit 114 notifies the content management information creating unit 119 whether the recording medium for recording the program content is built-in or removable (SA02).

  If it is removable, for example, “0” is entered as the number of copies of the management information, and the program content cannot be copied, but it can be moved (SA04). Note that the relationship with the operation that does not allow three or more copies described above is copy control when the above is received and recorded (for example, when the first generation copy is generated), for example. The description of FIG. 13 is different in that it is a story of copy control after recording on a recording medium (after the first generation copy is generated).

  If it is built-in, the content management information creation unit 119 determines whether the information indicating whether or not a plurality of copies is possible is “permitted” or “not permitted” (SA03).

  In the case of “No”, for example, “0” is input as the number of copies of the management information, and the program content cannot be copied, but it can be moved (SA04). Of course, deletion is also possible.

  In the case of “permitted”, “N” is input as the number of copies of the management information so that N copies of the program content are possible (SA05).

  By doing so, it is possible to copy a plurality of recorded program contents of one generation without being restricted by time, and the usability can be improved. Further, by determining whether or not a plurality of copies can be made depending on whether the recording medium is built-in or removable, in the case of built-in, the program content is locally encrypted as described above, and among the management information, key information, The copy information and the copy number program can be protected from being illegally falsified by managing them with encryption. On the other hand, in the case of removable, various management methods are conceivable, and there are things that cannot be managed as in the case of the built-in described above, and therefore it is possible that illegal tampering is inevitable. Thus, there is an effect of protecting the content while improving the convenience for the user.

<Copy processing related to copy control information>
FIG. 14 is a flowchart illustrating an example of a procedure for copying program content by the receiving device 3.

  When copying a program content whose management information copy information is “01” (No More Copies) and whose number of copies is “N” (N ≠ 0), it is monitored whether the copy processing has been completed. (SB01).

  If it has been completed, “N−1” (N ≠ 0) is input as the number of copies of the management information of the copy source recording medium so that N−1 copies of the program content can be made, and the copy destination “01” (No More Copies) is entered in the copy information of the management information of the recording medium to make the recopy prohibited state, and “0” is entered in the number of copies of the management information, but the program content cannot be copied, but the move ( (Movement) is possible (SB04).

  If not completed, it is monitored whether the copy process is interrupted (SB02).

  If not interrupted, it is monitored whether the copy process has been completed (SB01).

  If it is interrupted, “N−1” (N ≠ 0) is input as the number of copies of the management information of the copy source recording medium so that N−1 copies of the program content can be made, and the copy destination If a plurality of recording media can be recorded, the program content being copied is erased (SB03). However, in the case of a recording medium that can be recorded only once, the erasure process is not executed because it cannot be erased.

  By doing so, there is an effect that copy generation management of the program content at the copy destination can be reliably performed. Further, even when the copy process is interrupted for some reason, unnecessary program content does not remain at the copy destination, so that it is possible to save the trouble of erasing later and improve usability. In the above erasure, the data on the recording medium may be physically erased, or the management information is erased so that the data on the recording medium exists but cannot be reproduced (indirectly erased). You may do it.

<Move processing related to copy control information>
FIG. 15 is a flowchart illustrating the procedure for moving the program content of the receiving apparatus according to the embodiment.

  When the program information whose management information copy information is “01” (No More Copies) and the number of copies is “0” is being moved, it is monitored whether the move process has been completed (SC01).

  If it has been completed, the program content of the recording medium of the move source and the management information related to the program content are deleted, and “01” (No More Copies) is added to the copy information of the management information of the move destination recording medium. The re-copying prohibited state is entered and "0" is entered as the number of copies of the management information, and the program content cannot be copied but moved.

  If not finished, it is monitored whether the move process is interrupted (SC02).

  If it is not interrupted, it is monitored whether the move process has been completed (SC01).

  If it is interrupted, the program content of the part that has not yet been moved to the recording medium of the moving destination and the management information related to this program content during the movement of the moving source recording medium are stored, and the recording of the moving destination has already been performed. Reproduction of program content moved to the medium is disabled. Save the program content in the middle of the move destination recording medium, enter “01” (No More Copies) in the copy information of the management information to prohibit recopying, and enter “0” in the number of copies of the management information Thus, the program content cannot be copied, but can be moved (SC03).

  By doing this, there is an effect that copy generation management of program content at the move destination can be performed reliably. In addition, even if the move process is interrupted for some reason, the program content is stored in each of the recording media of the move source and the move destination, and the program content cannot be viewed by the interrupt, so that the usability is improved. is there. In the above erasure, the data on the recording medium may be physically erased, or the management information is erased so that the data on the recording medium exists but cannot be reproduced (indirectly erased). You may do it.

  In the above description, the recording medium at the copy destination or the move destination is a recording medium that can be managed as re-copying prohibition (No More Copies). If it cannot be managed, copy or move processing is prohibited.

  In the above description, the case of program content transmitted from a broadcasting station has been described. However, the present invention can also be applied to program content other than the broadcasting station such as a program content provider.

  Moreover, the removable recording medium means a recording medium that has an independent form that can be detached from the receiving apparatus and that can be reproduced even by an apparatus having other reproducing functions.

  Also, “move” refers to the movement of program content by disabling playback after copying “No More Copies” program content recorded on a recording medium to another recording medium. Means to do. Here, the disabling of reproduction means that the reproduction cannot be performed by deleting the program content itself, deleting the encryption key, deleting the management information, or the like. In the middle of the move process, it is preferable that program content having a length exceeding 1 minute is not present in both the move source and the move destination in a reproducible state.

  In the above description, for a program content in which “Copy One Generation” is “Allowed to copy a plurality of copies” and the information indicating whether copying is permitted is “possible”, it is determined that a recording medium can be copied. The determination is made depending on whether it is built-in or removable. However, it may be determined that a plurality of copies can be made on a recording medium that can manage a plurality of copies and a recording medium that cannot manage a plurality of copies. Good. Here, the recording medium capable of managing a plurality of copies is, for example, information on the copy information 507, the number of copies 508, and the key information 506 in the management information indicating the contents of the program content described in FIG. File number 503, date and time 504, and the start address of data area and recording size 505 may be included). This means a recording medium that can be managed so that it cannot be tampered with.

  FIG. 16 shows a configuration example of a recording medium (security removable medium) capable of managing such a plurality of copies (also called copy number control or number control copy). In this configuration, a normal area accessible to the user and a tamper-resistant area not accessible to the user are combined in one recording medium. Confidential information stored in the tamper-resistant area can be accessed when authentication is confirmed by an authentication process with a device that can handle this recording medium, so that confidential information can be managed. It has become. By storing and managing the information of the copy information 507, the number of copies 508, and the key information 506 in this tamper resistant area, unauthorized tampering is not performed.

  On the other hand, a recording medium that cannot manage a plurality of copies is information of copy information 507, number of copies 508, and key information 506 (other file number 503, date 504, data area) in the management information indicating the contents of the program content. A recording medium that can not be managed so that it cannot be tampered with.

  FIG. 17 shows copy information of management information in the case of recording a program content for which one-generation copying of a receiving device is permitted (Copy One Generation) in consideration of a recording medium capable of managing a plurality of copies and a recording medium that cannot. 6 is a flowchart illustrating an example of a copy number creation procedure. The difference from FIG. 13 is SD02. 13 may be combined. For example, SD02 may be executed when SA02 is “removable”.

  For example, the control unit 114 determines whether the recording medium for recording the program content is a recording medium that can manage a plurality of copies or a recording medium that cannot manage a plurality of copies, and notifies the content management information creation unit 119 (SD02). ).

  In the case of a recording medium that cannot manage a plurality of copies, for example, “0” is input as the number of copies of the management information, and the program content cannot be copied, but can be moved (SD04). ).

  In the case of a recording medium capable of managing multiple copies, the content management information creation unit 119 determines whether the information indicating whether multiple copies are possible is “possible” or “no” (SD03). In this case, for example, “0” is input as the number of copies of the management information, and the program content cannot be copied, but can be moved (SD04). In the case of “permitted”, “N” is input as the number of copies of the management information, and the program content can be copied N times (SD05).

By doing so, it is possible to copy a plurality of recorded program contents of one generation without being restricted by time, and the usability can be improved. In addition, a plurality of recording media that cannot manage multiple copies are determined by determining whether or not multiple copies can be made based on whether the recording medium is a recording medium that can manage multiple copies or a recording medium that cannot manage multiple copies. Copy permission can be avoided, and program content can be protected more reliably.
<Copy control processing via LAN>
A specific example of processing in the case of dubbing while maintaining the number of copies managed in a recording medium digitally connected via a LAN using the DTCP_descriptor described in FIG. 20 will be described. FIG. 21 shows a system configuration example in which recording apparatuses are digitally connected via a LAN.

  In the user home 2101, the content transmission device 2102 and the content reception device 2103 are connected to the network hub 2104 via a wired LAN cable, and the network hub 2104 is connected to the router 2105. The router 2105 is connected to the Internet 2106 via a modem or a photoelectric converter.

  World standard IP (Internet Protocol) is used as a network protocol in LAN, TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) are used as upper transport protocols, and higher application protocols are used for content transmission. For example, RTP (Real-time Transport Protocol), HTTP (Hyper Text Transfer Protocol), FTP (File Transfer Protocol) or the like is used. Note that IP has IPv4 (Internet Protocol Version 4) and IPv6 (Internet Protocol Version 6) versions, but is not limited to either.

  Each of the content transmission apparatus 2102, the content reception apparatus 2103, and the router 2105 has an IP address for identifying itself on the LAN. A 48-bit MAC (Media Access Control) address is given to the interface unit of each network communication processing unit. For setting the IP address to each device, for example, the router 2105 may be operated as a DHCP server by DHCP (Dynamic Host Configuration Protocol), and the IP address of each device may be allocated from here.

  In FIG. 21, the user home 2101 has a wired LAN connection between the devices, but a wireless LAN using a wireless access point may be used. Further, the hub 2104 and the router 2105 may be integrated.

  For example, the receiving device 3 described with reference to FIGS. 1 and 10 can be used as the content transmitting device 2102 and the content receiving device 2103 described with reference to FIG.

  FIG. 22 shows an example of the configuration of the network interface unit 106 corresponding to the LAN in the receiving apparatus 3 of FIG.

  The network interface unit 106 includes a timer unit 2202, a device information update unit 2203, a device information management unit 2201 including a device information storage unit 2204, a device authentication processing unit 2205, an encryption / decryption processing unit 2206, a communication processing unit 2207, a digital An input / output unit 2208 is included. Each component is connected to the control unit 114 via the bus unit, and the operation is controlled.

  The device authentication processing unit 2205 uses a specific authentication protocol with another device via the communication processing unit 2207 and the digital input / output unit 2208 in order to transfer the copyright protected content via, for example, the LAN. The devices authenticate each other and are properly certified and share a key used for content encryption / decryption. As the specific authentication protocol, for example, a DTCP-IP system or the like is used.

  The device information management unit 2201 manages information related to devices that have been successfully authenticated by the device authentication processing unit 2205. The timer unit 2202 is used when the device authentication processing unit 2205 confirms whether or not an authentication partner device exists in the house, or when the expiration date of registration information stored in the device information storage unit 2204 described later is managed. Measure time. The device information update unit 2203 manages the expiration date of registration information held in a device information storage unit 2204 described later, and performs registration / update / deletion as necessary. The device information storage unit 2204 holds information related to the authentication partner device when the device authentication processing unit 2205 succeeds in device authentication.

  The encryption / decryption processing unit 2206 uses the key shared by the device authentication processing unit 2205 to decrypt and receive the content encrypted by the transmission device received via the digital input / output unit 2208 via the LAN. The packet is analyzed and then output to the selector 102, or the broadcast reception transport packet output from the time stamp comparison / output unit 109 or the separation / extraction unit 103 is received and the key shared by the device authentication processing unit 2205 is used. Encryption processing is performed to generate a transmission packet that conforms to the network transmission standard. Thereby, both the broadcast content itself received by the tuner decoding unit 101 and the content recorded in the built-in recording medium 113 or the removable recording medium 118 can be transmitted.

  The communication processing unit 2207 transmits / receives contents and control commands to / from other devices connected via a LAN via the digital input / output unit 2208. "Copy Free", "Copy One Generation", "Copy Prohibition (indicating how to handle the content to be received at the time of reception or content to be transmitted at the time of transmission" In addition to copy control information such as “Copy Never” and “No More Copies”, copy control information such as the number of permitted copies is also added.

  The digital input / output unit 2208 inputs / outputs contents and control commands via the LAN.

  The device information stored in the device information storage unit 2204 is configured in, for example, a table format. The configuration information includes a registration ID indicating a registration number of the table, a device ID indicating an identifier for uniquely identifying each device as device information, And network address information indicating the IP address and MAC address of each device on the network. The device ID is, for example, a unique ID used in IEEE 1394, which is device-specific information generated by a specific certification authority and stored in advance in a nonvolatile memory when each device is manufactured, a device ID used in DTCP, and the like. Has a unique and unique value.

  FIG. 23 shows an example of a device authentication processing procedure executed between the content transmission apparatus 2102 and the content reception apparatus 2103 in the system configuration shown in FIG. Here, TCP is used as an information transmission / reception protocol for device authentication processing. When various information such as an authentication request to the other device and an authentication response to the other device are transmitted, a reception confirmation for the information is returned from the other device. Thus, a communication path capable of detecting a transmission error is secured. In FIG. 23, data transmission / reception for establishing and discarding a connection by TCP may be performed in accordance with TCP rules, and description thereof is omitted here.

  First, an authentication request is created from the content receiving apparatus 2103 side. The device authentication processing unit of the content reception device 2103 attaches device-specific information including a device ID to the authentication request and a certificate for the information, and sends the authentication request to the content transmission device 2102 via the communication processing unit and the digital input / output unit. (S2301).

  When the device authentication processing unit of the content transmission device 2102 receives an authentication request via the digital input / output unit and the communication processing unit and sends a reception confirmation to the content reception device 2103 (S2302), the device authentication processing unit of the content transmission device 2102 Creates an authentication request, and sends the authentication request to the content receiving device 3204 with the device-specific information including the device ID of the content transmitting device 2102 and its certificate as in the case of the content receiving device 2103 (S2303).

  The device authentication processing unit of the content reception device 2103 receives the authentication request and sends a reception confirmation to the content transmission device 2102 (S2304).

  Next, the device authentication processing unit of the content transmitting apparatus 2102 verifies each piece of information received in the authentication request, and sends an authentication response with parameters necessary for generating key information to the content receiving apparatus 2103 (S2305).

  The device authentication processing unit of the content receiving apparatus 2103 receives the authentication response and sends the reception confirmation to the content transmitting apparatus 2102 (S2306), creates an authentication response, and generates key information as in the case of the content transmitting apparatus 2102. Is sent to the content transmission apparatus 2102 (S2307), and an authentication key common to the content transmission apparatus 2102 is generated using the necessary parameters.

  The device authentication processing unit of the content transmission apparatus 2102 receives the authentication response and sends a reception confirmation to the content reception apparatus 2103 (S2308). Similar to the content reception apparatus 2103, the device authentication processing unit uses the necessary parameters in common with the content reception apparatus 2103. Generate an authentication key.

  Through the procedure so far, the device authentication processing unit of the content transmission device 2102 and the device authentication processing unit of the content reception device 2103 generate and share a common authentication key.

  Next, the content transmitting apparatus 2102 transmits to the content receiving apparatus 2103 that preparation for in-home confirmation is performed in order to confirm whether the content receiving apparatus 2103 is a device existing in the house (S2309).

  When the device authentication processing unit of the content receiving device 2103 receives the notification of in-home confirmation preparation and sends the reception confirmation to the content transmitting device 2102 (S2310), the device authentication processing unit creates an in-home confirmation preparation notification from its own side, and the content transmitting device 2102 (S2311).

  The device authentication processing unit of the content transmitting apparatus 2102 receives the notification of the in-home confirmation preparation and sends the reception confirmation to the content receiving apparatus 2103 (S2312), and receives the in-home confirmation setting request with information necessary for in-home confirmation. The data is sent to the device 2103 (S2313).

  The device authentication processing unit of the content reception device 2103 receives the home confirmation setting request, makes preparations necessary for home confirmation, and sends the reception confirmation to the content transmission device 2102 (S2314).

  Upon receiving the reception confirmation, the device authentication processing unit of the content transmission device 2102 starts a timer in the device information management unit, and then issues a home confirmation execution request for confirming whether the content reception device 2103 exists in the home. (S2315).

  The device authentication processing unit of the content receiving apparatus 2103 receives the in-home confirmation execution request and sends the reception confirmation to the content transmitting apparatus 2102 (S2316).

  Upon receipt of the reception confirmation, the device authentication processing unit of the content transmission apparatus 2102 stops the timer, and confirms that the measurement value from the issuance of the home confirmation execution request until the reception confirmation is received does not exceed a predetermined value. To do. If the measured value is less than or equal to the predetermined value, the content receiving device 2103 is present in the home and is determined to be a device that is within the range of personal use, and is sent to the content receiving device 2103 as a home confirmation result (S2317).

  On the other hand, when the measured value is larger than the predetermined value, the content receiving apparatus 2103 determines that there is a possibility that the content receiving apparatus 2103 exists outside the home, interrupts the subsequent processing, and ends the device authentication processing.

  The device authentication processing unit of the content receiving device 2103 that has received the in-home confirmation result sends a reception confirmation to the content transmitting device 2102 (S2318), and the device authentication processing unit of the content transmitting device 2102 uses it when encrypting the content. An exchange key is generated, the exchange key is encrypted using the authentication key, and sent to the content receiving apparatus 2103 together with an ID for identifying the exchange key (S2319).

  The device authentication processing unit of the content reception device 2103 decrypts the exchange key transmitted from the content transmission device using the authentication key, and sends a receipt confirmation (S2320).

  Upon receiving the reception confirmation, the device authentication processing unit of the content transmission device 2102 registers information related to the content reception device 2103 in a table storing device information in the device information management unit (S2321).

  Through the above processing, the device authentication processing unit of the content transmission device 2102 and the device authentication processing unit of the content reception device 2103 share a common exchange key. The exchange key is used to generate a common key for encrypting / decrypting content transmitted over the network. It should be noted that there is no problem in generating the authentication key, exchange key, and common key by using a known key generation / key exchange algorithm. Further, the processes of S2309 and S2313 and the processes of S2317 and S2319 may be executed together.

  The apparatus authentication processing procedure executed between the content transmission apparatus 2102 and the content reception apparatus 2103 when transferring content at home has been described above. By performing the above-described procedure, it is possible to confirm that the devices are mutually authorized devices and share a key used for content encryption / decryption.

  FIG. 24 is an example of a data structure in the case where the DTCP_descriptor information described in FIG. 20 is transmitted using the HTTP protocol using a packet different from the transmission content. Here, TCP is used as the transport layer protocol, but the TCP header is omitted.

  It consists of an HTTP header 2401, a DTCP_descriptor information transmission packet 2410, and a content transmission packet 2420.

  The DTCP_descriptor information transmission packet 2410 includes a DTCP_descriptor information header portion 2411 and a payload portion (DTCP_descriptor information) 2412. The content transmission packet 2420 includes a content header portion 2421 and a payload portion (content) 2422.

  In the DTCP_descriptor information header portion 2411 and the content header portion 2421, for example, 1-bit identification information is set at a fixed position on the header portion so that it can be easily detected which header portion is. That is, by checking this identification information, it is possible to easily identify whether it is the DTCP_descriptor information transmission packet 2410 or the content transmission packet 2420.

  The payload portion (DTCP_descriptor information) 2412 stores DTCP_descriptor information that has been subjected to cryptographic processing based on information such as an exchange key exchanged in the device authentication processing. The DTCP_descriptor information may include not only the configuration example shown in FIG. 20 but also information of a plurality of formats at the same time.

  The DTCP_descriptor information transmission packet 2410 indicates copy control information of the subsequent content, and needs to be inserted into the transmission data at least every time the copy control information of the content changes.

  The payload portion (content) 2422 stores content that has been subjected to encryption processing based on information such as an exchange key exchanged in the device authentication processing.

  In the format shown in FIG. 24, DTCP_descriptor information and contents are transmitted by performing encryption processing on the same TCP and HTTP session and using a key generated based on a common exchange key, thereby preventing alteration of DTCP_descriptor information. In addition, DTCP_descriptor information and content can be uniquely linked. Also, when content is transmitted using the RTP protocol without using the HTTP protocol, for example, the content can be transmitted with the same configuration as in FIG. 24 by replacing the HTTP header 2401 with the RTP header. Alternatively, if both the DTCP_descriptor information transmission packet 2410 and the content transmission packet 2420 are stored for each RTP packet, the DTCP_descriptor information can be transmitted reliably.

  FIG. 25 shows an example of a procedure in the case of transmitting content including copy permitted number in copy control information using DTCP_descriptor information.

  First, content to be transmitted between the content transmission device 2102 and the content reception device 2103 is determined (S2501). Here, the procedure up to content selection includes procedures such as discovery of the content transmission device 2102 in the content reception device 2103, presentation of content by the content transmission device 2102, selection of content in the content reception device 2103, and the like. Alternatively, procedures such as discovery of the content reception device 2103 in the content transmission device 2102, presentation of content by the content transmission device 2102, selection of content in the content transmission device 2102 may be used. This can be realized by using a technology such as DLNA (Digital Living Network Alliance).

  Next, the device authentication process described with reference to FIG. 23 is executed between the content transmission apparatus 2102 and the content reception apparatus 2103. When the device authentication process is completed, the control unit of the content reception device 2103 issues a content transmission request to the content transmission device 2102 using an HTTP GET request or the like via the communication processing unit (S2502).

  When the requested content can be transmitted, the control unit of the content transmission device 2102 transmits a reception confirmation indicating that transmission is possible using the HTTP response header or the like to the content reception device 2103 (S2503).

  Next, the encryption / decryption processing unit of the content transmission apparatus 2102 generates a DTCP_descriptor information transmission packet including a header including the DTCP_descriptor information transmission packet header and the encrypted DTCP_descriptor information in the format shown in FIG. Transmit (S2504).

  Subsequently, a content transmission packet including a header including the content transmission packet header portion and the encrypted content is transmitted in the format shown in FIG. 24 (S2505).

  Before and after S2502, the content receiving apparatus 2103 inquires of the content transmitting apparatus 2102 whether processing based on the DTCP_descriptor information is possible, and the processing of S2503 may be executed only when possible. Since not all devices connected to the LAN can handle the processing based on the DTCP_descriptor information, it is possible to detect as soon as possible that the processing based on the DTCP_descriptor information cannot be performed. If possible, before S2502 is preferable.

  If DTCP_CCI in the DTCP_descriptor information indicates copy free, the encryption processing in S2504 and S2505 may not be performed.

  Here, when the content to be transmitted is the broadcast content itself received by the tuner decoding unit 101, the DTCP_descriptor information is information included in the PSI or SI information (specifically, the content usage description) as described above. Copy control information such as a child and a digital copy control descriptor) is set as it is or with reference. When the content to be transmitted is content recorded on the internal recording medium 113 or the removable recording medium 118, the management information created by the content management information creation unit 119 is set as it is or with reference.

  By transmitting content according to the procedure shown in FIG. 25, it is possible to transmit content including DTCP_descriptor information.

  As described above, when content is transmitted using a wired or wireless LAN, copy control information including the permitted number of copies can be transmitted.

  Next, a case will be described in which content to be transmitted between the content transmission apparatus 2102 and the content reception apparatus 2103 described in the processing of S2501 in FIG. 25 is determined, that is, the user performs a content dubbing operation.

  In order for the user to check the content currently recorded on the recording medium of the content transmission device 2102, for example, the remote control of the content reception device 2103 to display the “recorded program list” of the content transmission device 2102 from the content reception device 2103. When the upper button or the selection button displayed on the screen of the content receiving apparatus 2103 is pressed using the remote control, the content list currently recorded on the recording medium of the content transmitting apparatus 2102 as shown in FIG. A recorded program list 2601 to be displayed on the screen is displayed.

  Reference numeral 2602 denotes a list of recording media that can display a recording list, which can be switched. A part of the content recorded on the recording medium selected in 2602 is displayed in 2603. From this state, the user performs a predetermined operation using a remote controller or the like, selects a content to be dubbed from 2603, and starts a dubbing menu (for example, pressing a “dubbing” button or pressing a menu button to start the menu) , Select “Dubbing” from the menu to start the dubbing menu.

  Although the remote control will be mainly described here, the present invention is not limited to the remote control. Further, when a screen is displayed in response to an operation, the control unit 114 analyzes the operation input received by the user interface unit 115 and causes the output unit 116 to output the screen.

  FIG. 27 shows an example of the dubbing menu. Reference numeral 2701 denotes a display screen, and in this example, the copyable number information of the content to be dubbed selected by the operation described with reference to FIG. 26 is analyzed (9 cases in FIG. 27). Here, the copyable number information of the content is 1 or more.

  In the menu, a message example 2702 indicating the number of copyable contents and a dubbing number setting menu 2703 for setting the number of copies by the user are displayed. In addition, when the content is “Copy free”, the number display part is written as “∞”, “unli mited”, “Free”, “Unlimited”, etc., indicating that unlimited copy operations can be performed. You may do it.

  The dubbing number setting menu 2703 is a menu that allows the user to select how many contents are to be copied, for example, by an operation of the remote controller or the like by the user. In this example, three contents are set to be copied by a user operation. This input can be easily performed using the 10 keys of the remote controller. The user sets the number of contents to be copied using a remote controller or the like, and then selects a “decision” button on the final decision button 2704 on the menu to start copying. It should be noted that even if there is no operation by a remote controller or the like, for example, the maximum copyable number (in the case of this figure, 9) as an initial value may be automatically set to allow the change.

  In this way, the user can easily set the number of copies to be made on a plurality of recording media while confirming the number of copies of the content, and the effect of protecting the content while improving user convenience There is.

  If the total number of copies set by the user on multiple recording media (hereinafter referred to as the user-set copy number) is one greater than the number of copyable contents, a notice is sent to the screen that the original content will be deleted. The user may confirm the intention of “execute” or “cancel”. Copying is allowed up to the same number as the number of copies, and a message indicating that copying is not possible may be displayed when the number of copies exceeds the limit. This is because +1 dubbing is possible.

  This eliminates the need for the user to operate the number of copies that can be copied and the move separately. In addition to the message “The original content will be deleted when copying up to the maximum copyable number +1”, the display message notifies you that “X copies and moves will be executed” Also good.

  Further, when the user set copy number is 2 or more larger than the copyable number of contents, an error message indicating that the copy is not possible may be displayed to prompt the user to input again. This is because even if the number of copies and the move can be combined, it cannot be executed. Alternatively, a numerical value that is two or more larger than the copyable number may not be input.

FIG. 28 shows another example of the dubbing menu. This example is a case where the copyable number is 0, or content for which one generation recording is permitted (Copy One Generation) is recorded and content that cannot be copied any more (No More Copies) is dubbed.
Reference numeral 2801 denotes a display screen. In this example, the content to be dubbed selected by the operation described with reference to FIG. 26 can only be moved.

  In the menu, a message example 2802 indicating that the content can only be moved and a menu 2803 for designating whether or not the user moves are displayed. This input is performed using a remote controller or the like. If the user moves content, the move is started by selecting the “Yes” button on the button on the menu. When the move is not performed, it is not executed by selecting the “No” button.

  In this way, when the user records 0 content that can be copied, or content that is permitted to be recorded for one generation (Copy One Generation) and dubbed content that cannot be copied any more (No More Copies) It can be set easily by only the button operation of “Yes”, and there is an effect of protecting contents while improving user convenience.

  A process when the content transmission apparatus 2102 uses the DTCP_descriptor information to transmit the content including the copy permitted number in the copy control information and the content reception apparatus 2103 receives the content will be described.

  The content receiving device 2103 receives the content from the content transmitting device 2102, the encryption / decryption processing unit detects the header part of the DTCP_descriptor information transmission packet, decrypts the encrypted DTCP_descriptor information, and passes through the control unit 114. It is passed to the content management information creation unit 119. Thereafter, the management information is created by the content management information creation unit 119 as described above. In addition, the encryption / decryption processing unit detects the header part of the content transmission packet, decrypts the encrypted content, and can process it in the receiving / recording / reproducing unit 10, for example, in a format such as MPEG-TS or MPEG-PS. After conversion, the data is output to the selector 102. The subsequent recording process is as described above. The recording process related to the copy control information of the DTCP_descriptor information is as follows.

  An example of a recording process related to copy control information of DTCP_descriptor information (particularly DTCP_CCI, Copy_count_Mode and Count information) will be described using the processing flow of FIG.

  First, if the DTCP_CCI information indicates that one-generation recording is permitted (Copy One Generation) (yes in S2901) and the Copy_count_Mode information is valid (yes in S2902), the copy permission specified in the Count information The number is set and the content is recorded (S2904). Specifically, management information is created by the content management information creation unit 119, DTCP_CCI information is stored in the copy generation control information, and Count information information is stored in the copy number control information. Then, the writing unit 112 stores the management information created by the content management information creation unit 119 and the encrypted data obtained by encrypting the content based on the key information in the management information. Processing for recording on the medium 118 is performed.

  If the Copy_count_Mode information is invalid (no in S2902), the content is recorded as no more copying (No More Copies) (S2905).

  There is no limit when the information of DTCP_CCI does not indicate that one-generation recording is permitted (Copy One Generation) (no in S2901), or when the information of DTCP_CCI indicates that copying is possible (Copy Free) (yes in S2903) The content is recorded as being copyable (S2906). At this time, whether or not the writing unit 112 performs encryption processing on the content depends on whether or not the EPN information is EPN Asserted copy free.

  If the DTCP_CCI information does not indicate copy free (No in S2903), it is not recorded (S2907).

  By using the DTCP_CCI, Copy_count_Mode, and Count information on the content transmission side and the reception side in such a procedure, appropriate copy control can be performed, and a digitally connected recording device via a wired / wireless LAN can be used. When recording, dubbing can be performed while maintaining the number of copies that can be managed, and there is an effect of protecting contents while improving user convenience.

  In the description of FIG. 29, the procedure for performing processing based on DTCP_CCI information in the information of DTCP_CCI, Copy_count_Mode, and Count has been described. However, processing can also be performed based on Copy_count_Mode. With respect to this procedure, another example of the recording process related to the copy control information will be described using the processing flow of FIG. Which information is used as a reference should be processed according to the specified procedure if it is specified in the DTCP-IP standard, for example.

  First, if the Copy_count_Mode information indicates that it is valid (yes in S3201), the copy permission number specified in the Count information is set and the content is recorded (S3204). Specifically, management information is created by the content management information creation unit 119, one generation of recording is permitted in the copy generation control information (Copy One Generation), and the information information of Count is stored in the copy number control information. . Then, the writing unit 112 stores the management information created by the content management information creation unit 119 and the encrypted data obtained by encrypting the content based on the key information in the management information. Processing for recording on the medium 118 is performed.

  If the Copy_count_Mode information is invalid (no in S3201) and the DTCP_CCI information indicates that one-generation recording is permitted (Copy One Generation) (yes in S3202), the content is recorded as no more copying (No More Copies). (S3205).

  There is no limit when the information of DTCP_CCI does not indicate that one-generation recording is permitted (Copy One Generation) (no in S3202), or when the information of DTCP_CCI indicates that copying is possible (Copy Free) (yes in S3203) The content is recorded as being copyable (S3206). At this time, whether or not the writing unit 112 performs encryption processing on the content depends on whether or not the EPN information is EPN Asserted copy free.

  If the DTCP_CCI information does not indicate copy free (No in S3203), it is not recorded (S3207).

  By using the DTCP_CCI, Copy_count_Mode, and Count information on the content transmission side and the reception side in such a procedure, appropriate copy control can be performed, and a digitally connected recording device via a wired / wireless LAN can be used. When recording, dubbing can be performed while maintaining the number of copies that can be managed, and there is an effect of protecting contents while improving user convenience.

  Another example of recording processing related to copy control information of DTCP_descriptor information (particularly, DTCP_CCI, Copy_count_Mode and Count information) will be described using the processing flow of FIG.

  First, if the DTCP_CCI information indicates that one-generation recording is permitted (Copy One Generation) (yes in S3401) and the Copy_count_Mode information is valid (yes in S3402), the copy permission specified in the Count information The number is set and the content is recorded (S3405). That is, content that is permitted to be recorded in one generation (Copy One Generation) is recorded in a state in which copying is permitted for the number specified in the Count information.

  Specifically, management information is created by the content management information creation unit 119, DTCP_CCI information is stored in the copy generation control information, and Count information information is stored in the copy number control information. Then, the writing unit 112 stores the management information created by the content management information creation unit 119 and the encrypted data obtained by encrypting the content based on the key information in the management information. Processing for recording on the medium 118 is performed.

  If the Copy_count_Mode information is invalid (no in S3402), the content is recorded as no more copying (No More Copies) (S3406).

  When the DTCP_CCI information does not indicate one-generation recording (Copy One Generation) (No in S3401), the DTCP_CCI information indicates that copying is possible (Copy Free) (Yes in S3403), and the Copy_count_Mode information is valid (S3404). If yes, the permitted number of copies specified in the Count information is set and the content is recorded (S3407).

  That is, content that can be copied without restriction (Copy Free) is recorded in a state where copying is permitted for the number of times specified in the Count information. If the Copy_count_Mode information is invalid (no in S3404), the content is recorded as being copyable without restriction (S3408). At this time, whether or not the writing unit 112 performs encryption processing on the content depends on whether or not the EPN information is EPN Asserted copy free.

  If the DTCP_CCI information does not indicate copy free (No in S3403), it is not recorded (S3409).

  By using the information of DTCP_CCI, Copy_count_Mode, and Count on the content transmission side and the reception side in such a procedure, appropriate copy control can be performed. When recording to a digitally connected recording device via a wired / wireless LAN, it is possible to perform dubbing while maintaining the number of copies that can be managed, protecting the content while improving user convenience. There is an effect to plan.

  In the description of FIG. 34, the procedure for performing processing based on DTCP_CCI information in the information of DTCP_CCI, Copy_count_Mode, and Count has been described. However, processing can also be performed based on Copy_count_Mode. With respect to this procedure, another example of the recording process related to the copy control information will be described using the process flow of FIG. Which information is used as a reference should be processed according to the specified procedure if it is specified in the DTCP-IP standard, for example.

  First, when the Copy_count_Mode information indicates valid (yes in S3601), and when the DTCP_CCI information indicates that one generation recording is permitted (Copy One Generation) (yes in S3602), it is specified in the Count information. The permitted copy number is set and the content is recorded (S3606). That is, content that is permitted to be recorded in one generation (Copy One Generation) is recorded in a state in which copying is permitted for the number specified in the Count information.

  Specifically, management information is created by the content management information creation unit 119, one generation of recording is permitted in the copy generation control information (Copy One Generation), and the information information of Count is stored in the copy number control information. . Then, the writing unit 112 stores the management information created by the content management information creation unit 119 and the encrypted data obtained by encrypting the content based on the key information in the management information. Processing for recording on the medium 118 is performed.

  If the information of DTCP_CCI does not indicate that one-generation recording is permitted (Copy One Generation) (no in S3602), or if the information of DTCP_CCI indicates that copying is possible (Copy Free) (yes in S3603), the Count information The permitted number of copies specified in is set and the content is recorded (S3607).

  That is, content that can be copied without restriction (Copy Free) is recorded in a state where copying is permitted for the number of times specified in the Count information. If the DTCP_CCI information does not indicate copy free (No in S3603), the information is not recorded (S3608).

  If the Copy_count_Mode information is invalid (no in S3601) and the DTCP_CCI information indicates that one-generation recording is permitted (Copy One Generation) (yes in S3604), the content is recorded as no more copying (No More Copies). (S3610).

  If the DTCP_CCI information does not indicate that one-generation recording is permitted (Copy One Generation) (no in S3604), or if the DTCP_CCI information indicates that copying is possible (Copy Free) (yes in S3605), there is no limit. The content is recorded as being copyable (S3609). At this time, whether or not the writing unit 112 performs encryption processing on the content depends on whether or not the EPN information is EPN Asserted copy free.

  If the DTCP_CCI information does not indicate copy free (No in S3605), the information is not recorded (S3608).

  By using the DTCP_CCI, Copy_count_Mode, and Count information on the content transmission side and the reception side in such a procedure, appropriate copy control can be performed, and a digitally connected recording device via a wired / wireless LAN can be used. When recording, dubbing can be performed while maintaining the number of copies that can be managed, and there is an effect of protecting contents while improving user convenience.

  The recording process related to the copy control information when the DTCP_descriptor information is in the format described with reference to FIG. 20 has been described above. The case where the DTCP_descriptor information is in the format shown in FIG. 30 will be described next.

  FIG. 30 shows a format when Copy_count_Mode information is deleted in the DTCP_descriptor information of FIG. An example of a recording process related to the copy control information of the DTCP_descriptor information (particularly, DTCP_CCI, ount information) shown in FIG. 30 will be described using the processing flow of FIG.

  First, if the information of DTCP_CCI indicates that one-generation recording is permitted (Copy One Generation) (yes in S3101), and if the Count information is not 0 (yes in S3102), it is specified in the Count information. The number of permitted copies is set and content is recorded (S3104).

  Specifically, management information is created by the content management information creation unit 119, DTCP_CCI information is stored in the copy generation control information, and Count information information is stored in the copy number control information. Then, the writing unit 112 stores the management information created by the content management information creation unit 119 and the encrypted data obtained by encrypting the content based on the key information in the management information. Processing for recording on the medium 118 is performed.

  If the Count information is 0 (no in S3102), the content is recorded as no more copying (No More Copies) (S3105).

  There is no limit when the information of DTCP_CCI does not indicate that one-generation recording is permitted (Copy One Generation) (no in S3101), and when the information of DTCP_CCI indicates that copying is possible (Copy Free) (yes in S3103) The content is recorded as being copyable (S3106). At this time, whether or not the writing unit 112 performs encryption processing on the content depends on whether or not the EPN information is EPN Asserted copy free.

  If the DTCP_CCI information does not indicate copy free (No in S3103), the information is not recorded (S3107).

  By using the DTCP_CCI and Count information on the content transmission side and the reception side in such a procedure, appropriate copy control can be performed, and recording is performed on a digitally connected recording device via a wired / wireless LAN. Sometimes, dubbing can be performed while maintaining the number of copies that can be managed, and there is an effect of protecting contents while improving user convenience.

  In the description of FIG. 31, the procedure for performing processing based on DTCP_CCI information in the information of DTCP_CCI and Count has been described. However, processing can also be performed based on Count. With respect to this procedure, another example of the recording process related to the copy control information will be described using the process flow of FIG. Which information is used as a reference may be processed according to the specified procedure if it is specified in the DTCP-IP standard, for example.

  First, if the Count information is not 0 (yes in S3301), the permitted number of copies specified in the Count information is set and the content is recorded (S3304). Specifically, management information is created by the content management information creation unit 119, copy generation generation information is stored in the copy generation control information (Copy One Generation) information, and count information information is stored in the copy number control information. Is done. Then, the writing unit 112 stores the management information created by the content management information creation unit 119 and the encrypted data obtained by encrypting the content based on the key information in the management information. Processing for recording on the medium 118 is performed.

  If the Count information indicates 0 (no in S3302) and the DTCP_CCI information indicates that one-generation recording is permitted (Copy One Generation) (yes in S3302), no further copying is possible (No Content is recorded as “More Copies” (S3305).

  There is no limit when the information of DTCP_CCI does not indicate that one-generation recording is permitted (Copy One Generation) (no in S3302), or when the information of DTCP_CCI indicates that copying is possible (Copy Free) (yes in S3303) The content is recorded as being copyable (S3306). At this time, whether or not the writing unit 112 performs encryption processing on the content depends on whether or not the EPN information is EPN Asserted copy free.

  When the information of DTCP_CCI does not indicate copy free (No in S3303), it is not recorded (S3307).

  By using the DTCP_CCI and Count information on the content transmission side and the reception side in such a procedure, appropriate copy control can be performed, and recording is performed on a digitally connected recording device via a wired / wireless LAN. Sometimes, dubbing can be performed while maintaining the number of copies that can be managed, and there is an effect of protecting contents while improving user convenience.

  Next, another example of the recording process related to the copy control information of the DTCP_descriptor information (particularly DTCP_CCI, ount information) shown in FIG. 30 will be described using the processing flow of FIG.

  First, when the information of DTCP_CCI indicates that one-generation recording is permitted (Copy One Generation) (yes in S3501), if the Count information is not 0 (yes in S3502), it is specified in the Count information. The number of copies allowed is set and the content is recorded (S3505). That is, content that is permitted to be recorded in one generation (Copy One Generation) is recorded in a state in which copying is permitted for the number specified in the Count information. Specifically, management information is created by the content management information creation unit 119, DTCP_CCI information is stored in the copy generation control information, and Count information information is stored in the copy number control information.

  Then, the writing unit 112 stores the management information created by the content management information creation unit 119 and the encrypted data obtained by encrypting the content based on the key information in the management information. Processing for recording on the medium 118 is performed.

  If the Count information is 0 (no in S3502), the content is recorded as no more copying (No More Copies) (S3506).

  When the information of DTCP_CCI does not indicate one-generation recording is permitted (Copy One Generation) (no in S3501), and when the information of DTCP_CCI indicates that copying is possible (Copy Free) (yes in S3503), the Count information is 0. If not (Yes in S3504), the number of permitted copies specified in the Count information is set and the content is recorded (S3507).

  That is, content that can be copied without restriction (Copy Free) is recorded in a state where copying is permitted for the number of times specified in the Count information. If the Count information is 0 (no in S3504), the content is recorded as being copyable without restriction (S3508). At this time, whether or not the writing unit 112 performs encryption processing on the content depends on whether or not the EPN information is EPN Asserted copy free.

  If the DTCP_CCI information does not indicate copy free (No in S3503), it is not recorded (S3509).

  By using the DTCP_CCI and Count information on the content transmission side and the reception side in such a procedure, appropriate copy control can be performed. When recording to a digitally connected recording device via a wired / wireless LAN, it is possible to perform dubbing while maintaining the number of copies that can be managed, protecting the content while improving user convenience. There is an effect to plan.

  In the description of FIG. 35, the procedure for performing processing based on DTCP_CCI information in the information of DTCP_CCI and Count has been described. However, processing can also be performed based on Count. With respect to this procedure, another example of the recording process related to the copy control information will be described using the process flow of FIG. Which information is used as a reference should be processed according to the specified procedure if it is specified in the DTCP-IP standard, for example.

  First, if the Count information is not 0 (yes in S3701) and the DTCP_CCI information indicates that one-generation recording is permitted (Copy One Generation) (yes in S3702), the copy specified in the Count information The permitted number is set and the content is recorded (S3706). That is, content that is permitted to be recorded in one generation (Copy One Generation) is recorded in a state in which copying is permitted for the number specified in the Count information. Specifically, management information is created by the content management information creation unit 119, copy generation generation information is stored in the copy generation control information (Copy One Generation) information, and count information information is stored in the copy number control information. Is done.

  Then, the writing unit 112 stores the management information created by the content management information creation unit 119 and the encrypted data obtained by encrypting the content based on the key information in the management information. Processing for recording on the medium 118 is performed.

  If the information of DTCP_CCI does not indicate that one-generation recording is permitted (Copy One Generation) (no in S3702), or if the information of DTCP_CCI indicates that copying is possible (Copy Free) (yes in S3703), the Count information The permitted number of copies specified in is set and the content is recorded (S3707).

  In other words, content that is copy-free (Copy Free) is recorded in a state where copying is permitted for the number of times specified in the Count information. If the information of DTCP_CCI does not indicate copy free (No in S3703), it is not recorded (S3708).

  If the Count information indicates 0 (no in S3701), and the DTCP_CCI information indicates that one generation recording is permitted (Copy One Generation) (yes in S3704), no more copying is possible (No Content is recorded as “More Copies” (S3710).

  There is no limit when the information of DTCP_CCI does not indicate that one-generation recording is permitted (Copy One Generation) (no in S3404), or when the information of DTCP_CCI indicates that copying is possible (Copy Free) (yes in S3705) The content is recorded as being copyable (S3709). At this time, whether or not the writing unit 112 performs encryption processing on the content depends on whether or not the EPN information is EPN Asserted copy free.

  If the DTCP_CCI information does not indicate copy free (No in S3705), it is not recorded (S3708).

  By using the DTCP_CCI and Count information on the content transmission side and the reception side in such a procedure, appropriate copy control can be performed. In other words, when recording to a digitally connected recording device via a wired / wireless LAN, it is possible to perform dubbing while maintaining the number of copies that can be managed, and to protect the content while improving user convenience. There is an effect to plan.

  The example of the recording process in the receiving apparatus has been described above with reference to FIGS. 29 and 31 to 37. In this case, in the transmitting apparatus, it is necessary to set DTCP_descriptor information so that the receiving apparatus can perform the recording process. There is. That is, the copyright management of content is correctly performed on the transmission device side, and correct copy control information based on a request on the reception device side is generated and provided to the reception device side.

  In the above description, the transmission device and the reception device are one-to-one, but when a plurality of reception devices are connected to the transmission device 1, the following processing is performed.

  That is, 1 to n (plural) dubbing is permitted if the authentication process between the devices is completed before the start of dubbing and the number of contents can be managed between the transmitting and receiving devices. In addition, it is not allowed to add a receiving device after starting dubbing.

  In the above description, when the digital copy control information is “one-generation copy is permitted”, if “digital_recording_control_mode” is “1”, it is determined that “number limited copy is permitted”, and “digital_recording_control_mode” is “0”. In this case, it has been described that it is determined that it is not the target of “number limited copy allowed”, but the determination of “0” and “1” may be set in reverse according to the convenience of the broadcasting station system.

  That is, when the digital copy control information is “one-generation copying is possible”, if “digital_recording_control_mode” is “0”, it is determined that the number of copies is permitted, and if “digital_recording_control_mode” is “1”, It may be determined that it is not a target of “number-limited copy permitted”. Similarly, the meanings of values indicated by other descriptors may be changed to different settings depending on the situation.

  Further, it is desirable that the meaning of the value indicated by each descriptor, such as the value of “digital_recording_control_mode”, is uniquely determined by standardization.

  Further, the names of the content use descriptor and the digital copy control descriptor (such as “digital_recording_control_mode” and “digital_recording_control_data”) are not necessarily the names in the embodiment, and other names may be adopted.

It is a block diagram which shows the structural example of a system. 3 is a block diagram illustrating a configuration example of a transmission device 1. FIG. It is an example of the structure of the content use descriptor which is one of copy control information. This is a description example for each field of the content usage descriptor. It is an example of the structure of the digital copy control descriptor which is one of copy control information. It is an example of the information which controls a copy generation. It is an example of the reception process in the receiver 3 of each field of the content use descriptor sent from the transmitter 1. This is an operation example of protection of program content by using the copy control information by the transmission apparatus 1. This is an example of control when the receiving device 3 stores (records) program content using copy control information. 3 is a block diagram illustrating an example of a configuration of a receiving device 3. FIG. It is a figure which shows the example of the transport packet which added the time stamp. It is a figure which shows the example which recorded the program content on the recording medium. The copy of one generation is a flowchart showing an example of a procedure for creating copy information and the number of copies of management information when recording permitted program content. It is a flowchart which shows the example of the procedure which copies program content. It is a flowchart which shows the example of the procedure of moving (moving) program content. The figure which shows an example of the recording medium which can manage several copies. The copy of one generation is a flowchart showing an example of a procedure for creating copy information and the number of copies of management information when recording permitted program content. The figure which shows an example of the restriction | limiting of the number of copies. The figure which shows an example of the alternative output destination of the content accumulate | stored by "the number limitation copy is possible", and its copy control. The figure which shows an example of the copy control information of the content data in DTCP. 1 is a diagram illustrating a system configuration example in which recording apparatuses are digitally connected via a LAN. The figure which shows the example of 1 structure in case the network interface part 106 respond | corresponds to LAN. The figure which shows an example of a device authentication processing procedure. The figure which shows an example of the data structure in the case of transmitting a content using an HTTP protocol. The figure which shows an example of the procedure in the case of transmitting the content containing the number of copies permitted in copy control information. The figure which shows an example of a content list. The figure which shows an example of a dubbing menu. The figure which shows the other example of a dubbing menu. FIG. 6 is a diagram for explaining an example of a recording process related to copy control information. The figure which shows the example of another format of DTCP_descriptor information. FIG. 6 is a diagram for explaining an example of a recording process related to copy control information. FIG. 10 is a diagram for explaining another example of recording processing related to copy control information. FIG. 10 is a diagram for explaining another example of recording processing related to copy control information. FIG. 10 is a diagram for explaining another example of recording processing related to copy control information. FIG. 10 is a diagram for explaining another example of recording processing related to copy control information. FIG. 10 is a diagram for explaining another example of recording processing related to copy control information. FIG. 10 is a diagram for explaining another example of recording processing related to copy control information.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Reception recording / reproducing part 101 ... Tuner decoding part 102 ... Selector 103 ... Separation / extraction part 104 ... Input buffer part 105 ... Decoding part 106 ... Network interface part 107 ... Buffer management part 108 ... Clock reproduction part 109 ... Time stamp comparison / Output unit 110 ... Time stamp adding unit 111 ... Reading unit 112 ... Writing unit 113 ... Built-in recording medium 114 ... Control unit 115 ... User interface unit 116 ... Output unit 117 ... Fixed clock generating unit 118 ... Removable recording medium 119 ... Content management information Creation unit 120 ... Content management information analysis unit 121 ... Recording device 122 ... Recording device

Claims (1)

A recording control method for receiving digital content and a plurality of copy control information used for controlling the recording of the digital content and recording the digital content,
The first information in the received copy control information indicates that only one generation copy is permitted, and the second information in the received copy control information is the third information in the received copy control information. The digital content is recorded in a copyable state up to the number of copies permitted by the third information,
When the first information indicates that only one generation of copying is permitted, and the second information indicates that the third information is invalid, the digital content can be copied in a state where copying is prohibited. Recording control method for recording.

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