JP4604105B2 - Digital information recording apparatus and digital information recording / reproducing method - Google Patents

Description

  The present invention relates to an apparatus capable of restricting recording of digital information to be protected on a recording medium.

  The following Patent Document 1 is related to a digital content recording / playback apparatus compatible with copy generation control. In Patent Document 1, when “Copy One Generation” content indicating that copy control information can be copied for only one generation is recorded on a recording medium, the content is recorded as “Copy One Generation” within a specified time. A digital content recording / reproducing apparatus that makes it possible to view the information on the hard disk after making a backup to another medium by compensating for the part that was missed or recording a plurality of identical contents on the recording medium Is related to.

JP 2002-319227 A

  In recent years, high-precision liquid crystal monitors are being installed in portable terminals such as mobile phones, and an environment in which digital content can be viewed while moving or at a moving destination is being improved. Under the circumstances, in the recording / reproducing apparatus disclosed in Patent Document 1, it is considered that one of a plurality of recorded contents is moved to the portable terminal and viewed.

  However, the recording / reproducing apparatus disclosed in Patent Document 1 does not describe specific implementation means. Further, since there is no means for limiting the number of times of backup to another medium, the copyright holder cannot specify the number of times of backup for the content of “Copy One Generation”, and the copyright protection cannot be realized.

  Other media to be backed up can be various media such as semiconductor memory and optical disk, and these can be recorded on a hard disk connected to the recording / reproducing apparatus, so the recording capacity is reduced. Therefore, it is necessary to convert to a compression rate suitable for each medium.

In order to solve the above-mentioned problems , for example, it may be configured as described in the claims.

  ADVANTAGE OF THE INVENTION According to this invention, the apparatus and method which can perform recording restrictions to the recording medium in the recording / reproducing apparatus of the digital information which should protect copyright can be provided, and usability improves.

  Embodiments of a digital information recording / reproducing apparatus according to the present invention will be described below.

1. Example of Configuration for Making a Copy at the Same Time as Move FIG. 1 shows that a content to which a copy generation control signal is attached is recorded on a recording medium such as a hard disk, and the recorded content is allowed to be moved a specified number of times on another recording medium. 1 is a block diagram showing an embodiment of a digital information recording / reproducing apparatus 100. FIG.

  In the figure, reference numeral 1 denotes an input terminal for inputting, for example, an MPEG2 transport stream (hereinafter referred to as MPEG2-TS) used in digital broadcasting or the like. A control signal detection unit 2 detects copy generation control information included in the input MPEG2-TS, and transmits a detection result to the control unit 10 via the control bus 22. Reference numeral 3 denotes a switching unit, and the control unit 10 switches streams from the control signal detection unit 2 and a decoding control unit 14 described later. An encryption control unit 13 encrypts the input MPEG2-TS. A recording control unit 4 buffers a stream to be recorded on the recording medium 6 and / or management information in the memory 9 and issues a command for recording to perform processing such as stream transfer. An input / output unit 5 connects the recording medium 6 to the digital information recording / reproducing apparatus 100 to perform data transfer. Reference numeral 6 denotes a recording medium, which is composed of, for example, a hard disk. A reproduction control unit 7 issues a command to the recording medium 6 to reproduce management information and a stream, and then buffers the data in the memory 9 and outputs the stream to the decoding control unit 14. Further, the reproduction control unit 7 supplies, for example, management information or a stream to the disabling control unit 8 according to the result detected by the control signal detection unit 2. The disable control unit 8 performs a conversion process for making it impossible to restore the input management information or stream, and supplies the management information or stream to the recording control unit 4. Reference numeral 9 denotes a memory, which is a buffer for buffering streams from the recording control unit 4 and the reproduction control unit 7 in different areas, reading or writing in a time division manner, and continuously accessing, for example, A semiconductor memory is used. A decryption control unit 14 decrypts the encrypted MPEG2-TS. Reference numeral 10 denotes a control unit which is constituted by, for example, a microprocessor and controls the digital information recording / reproducing apparatus 100. Reference numeral 11 denotes a move count information update unit that detects the number of moves of content recorded on the recording medium 6 and transmits the result to the control unit. Reference numeral 12 denotes an output terminal which outputs the decrypted content from the decryption control unit 14. A control bus 22 performs data communication between the control unit 10 and each block connected to the control bus. Reference numeral 23 denotes a remote control interface control unit, which transmits a signal for the user to operate the digital information recording / reproducing apparatus 100 from the outside via the input / output unit 24 to the control unit 10.

  FIG. 2 is a diagram showing an example in which content is recorded on the recording medium 6. For each content, management information indicating the content and content data are recorded in a management information area 501 and a data area 502, respectively. In the management information, for example, a file number 503 indicating the title of the content, the start address and recording size 504 of the data area, copy information 508, the number of moves 509, key information 506, and the like are recorded. In the data area, contents are written from the address corresponding to the head address 504 recorded in the management information area 501. Every time content is newly recorded, file number 1, file number 2,..., File number n, management information, and content are sequentially recorded.

  The copy information 508 is copy generation control information detected by the control signal detector 2, and for example, 00 = Copy Free with a 2-bit signal 10 = Allow recording only one generation (Copy One Generation) 11 = Copy Never may be specified. The content recorded with “Copy One Generation” in the digital information recording / reproducing apparatus 100 may be defined as “Copy No More” that is copied once with 01 = Copy One Generation.

  The number of moves 509 stores, for example, information indicating the number of permitted copies for enabling the content recorded with the content of “Copy One Generation” as “Copy No More” in the same or different format, for example, 3 Enter 2 to indicate the meaning of permission.

  2. Description of Encryption / Decryption Control Unit FIG. 3 is an example showing the configuration of the encryption control unit 13. A plurality of 201, 202, and 203 are key information, which are seeds for calculating an encryption key. For example, unique information built in the recording medium 6, a random number calculated by a random number generator, or the like is used. Reference numeral 204 denotes an input terminal for inputting the result held in the move number information update unit, which is one of key information. One or more pieces of the key information 201 to 204 correspond to the key information 506 in the management information area 501. A key generation unit 205 generates an encryption key from the key information. An input terminal 206 is directly connected to the switching unit 3 corresponding to plain text. Reference numeral 207 denotes an encryption device, 208 denotes an output terminal, and a signal encrypted by the encryption device 207 is supplied to the recording control unit 4.

  FIG. 4 is an example showing the configuration of the decoding control unit 14. Similar to the encryption control unit 13, the key information 201, 202, 203 and the key information from the input terminal 204 are supplied to the key generation unit 205 to generate a decryption key. Reference numeral 209 denotes an input terminal to which a signal obtained by reproducing the ciphertext recorded on the recording medium 6 via the reproduction control unit 7 is supplied. Reference numeral 210 denotes a decoder, and 211 denotes an output terminal, which outputs a signal decoded by the decoder 210.

  FIG. 5 is a diagram illustrating a configuration example of the key generation unit 205. In the figure, 201, 202, 203, and 204 are key information, 212 and 214 are registers, and 213 is a hash function calculator. The register 212 temporarily holds key information and inputs the key information to the hash function calculator 213. The output calculated by the hash function calculator 213 is held in the register 214 and used as an encryption key or a decryption key. Here, as an example of key information, 168 bits obtained by concatenating 128-bit key information 1, 8-bit key information 2, 16-bit key information 3, and 16-bit key information 4 are supplied to the hash function calculator 212. To do. The hash function calculator 212 performs a hash operation on the 168 bits, and uses, for example, 128 bits of the calculation result as an extraction key. The hash function is a function whose input data is difficult to guess from the output result, and key information that is secret information cannot be obtained from the data key. In the present invention, the number of key information, the concatenation method, and the bit width are not particularly limited.

  In the above-described configuration, since the “number of copies” as one of the key information changes every time the move is executed, the encryption key is calculated and the key information 506 in the management information area 501 is updated each time.

  Since the encryption key is different for the same content, if only the “copy count” is falsified, the recorded content cannot be decrypted, and the number of content moves can be more reliably limited. High-strength copyright protection can be realized.

  Further, by changing any one of the key information 201, 202, 203, 204 at the time of executing the move, the limit of the number of moves can be similarly defined.

  3. Explanation of Operation Next, the operation will be described on the assumption that the copy generation control signal at the time of recording the content of file number 1 is “Copy One Generation” and “3 times” move is permitted at the number of moves 509.

  First, at the time of recording, recording control information 501 such as a recording destination address of the content is set by the control unit 10 and recorded on the recording medium 6 via the recording control unit 4. Next, MPEG2-TS is input from the input terminal 1, the copy generation control information added in the specific packet is detected by the control signal detection unit 2, and “10” as the detection result is transmitted via the control bus 22 to the control unit 10. Notify Since the received copy management information is “Copy One Generation”, the control unit 10 stores “Copy No More” in the content copy information 508 as “Copy No More” for prohibiting subsequent copies.

  Further, when the content is recorded, the number of times of copying can be three times, so that “2” obtained by subtracting 1 from 3 is set in the key information 214 to generate an encryption key, and the used key information is stored in the management information area 501. Is recorded as key information 1. After that, the encrypted recording is continued in the data area 502 until the content being recorded is completed, and the size at the time when a predetermined amount of recording is completed or a stop request by the user is input from the remote control interface control unit 23 is addressed. And record together. The content is “Copy No More” in the copy management information, but can be moved up to twice.

  Next, the reproduction (move) of the content of file number 1 will be described. FIG. 14 shows an example of an operation screen for the user to operate by connecting the output terminal 12 of the digital information recording / reproducing apparatus 100 to a decoder and a monitor.

  In the figure, (a) is a diagram showing a list of recorded contents, (b) is a diagram showing a screen for confirming the number of moves after transition from (a), and (c) is a diagram further transitioning from (b). It is a figure which shows the screen which selects a destination, (d) is an example which shows the screen which finished the move, and the number of possible movements was subtracted, (e) further transits from (d), and the permitted move It is a figure which shows the example which performed the frequency | count and the content was deleted from the title column. 401 indicates the title of the recorded content, 402 indicates the recording date and time, 403 indicates the recording mode indicating the bit rate at the time of recording, 404 indicates the number of possible moves, and 405 indicates a menu for selecting the move destination.

  First, when the control unit 10 detects a signal indicating that “play” or “move” is selected by the user from the remote control interface control unit 23, the control unit 10 reads the management information area 501 recorded on the recording medium 6 and records the recorded content. The screen (a) in the figure showing the list is displayed. When the control unit 10 in FIG. 2 detects a signal indicating that the user has selected the title “AAAAA”, the information of the file number 1 corresponding to the “AAAAA” content is read. At this time, the screen transitions to the screen (b) in the figure, the number of possible moves is displayed to the user, confirmation of the move execution is prompted, and input is awaited.

  As a result, the user can recognize the number of times that the move can be performed, and can execute it while being aware of the remaining number of moves.

  When permission by the user is detected, the screen changes to the screen (c) in the figure to determine the move destination. Here, the screens (b) and (c) in the figure may be the same screen.

  When the user selects a move destination, the key information 506 is read from the management information in FIG. Next, the read value is set in each key information of the decryption control unit 14 in FIG. 1 to generate a decryption key. Further, the generated decryption key is set in the decryption control unit 14.

  Also, the number-of-moves-information update unit 11 refers to the number of moves 509 in the management information, and holds “1”, which is a value obtained by subtracting “1” from the original value “2”. Further, the control unit 10 newly creates a file number n having the same data size as the file number 1 in the management information area 501 in FIG. 2, and uses the value held in the move number information update unit 11 as the move number 509. Rewrite to At the same time, the management information of the file number 1 is supplied from the reproduction control unit 7 to the disabling control unit 8, and after performing arithmetic processing such as rewriting all the original data to “1”, the result is held.

  Even if the management information calculated by the disabling control unit 8 is only the key information 506, since the original encryption key is not generated, there is an advantage that the same effect can be obtained and the time required for the control can be minimized.

  Further, after switching the switching unit 3 to the signal from the reproduction control unit 7, the content for the designated size is read from the head address recorded at the address 1, and the move process is started. At this time, the playback control unit 7 changes the copy management information of the content to be moved to “Copy One Generation”.

  The reproduced content is decrypted by the decryption control unit 14 and then output from the output terminal 12. At the same time, the copy management information is transmitted via the switching unit 3, the encryption control unit 13, the recording control unit 4, and the memory 9. The contents of “Copy No More” are recorded in order from the head address specified at the address n of the file number n. The number of copies, which is one of the key information at this time, is “1”. The recording control unit 4 and the reproduction control unit 7 buffer each content in the memory 9 and control the recording medium 6 in a time-sharing manner to continuously execute recording and reproduction. When the reproduction and recording for the specified size are completed, the calculation result of the file number 1 held in the disabling control unit 8 is written into the management information area of the file number 1 by the recording control unit 4.

  Thereafter, by rewriting the file number of the management information of the file number n to 1, the content of the file number 1 with the copy count subtracted by 1 exists in the recording medium 6. FIG. 14D shows an operation screen at the end of the move, in which the number of copies is changed to “1”.

  Further, when the number of copies is “1”, a copy is not generated in the management information area 501, and the management information that cannot be reproduced is overwritten on the management information of the file number 1 by the disabling control unit 8 at the end of the move. . Thereby, as shown in the screen (e), the content of the title “AAAAA” is deleted.

  With the above configuration, the copy generation control signal records “Copy One Generation” content, and a recording / playback device that restricts the number of moves for content that becomes “Copy No More” content can be realized. Can protect the copyright. In addition, for the user, the same content can be moved to other recording media within the specified number of times, and since the content exists in the recording / playback apparatus even after the move, viewing is possible and usability is improved. Further, since a plurality of identical contents are not prepared, the capacity of the recording medium 6 can be used effectively.

4). Next, an embodiment in which the digital information recording / reproducing apparatus 100 according to the first embodiment is applied to a digital broadcast recorder 1000 will be described with reference to FIG. Components having the same function are denoted by the same reference numerals and description thereof is omitted.

  Reference numeral 301 denotes an input terminal to which radio waves from a relay station such as a broadcasting satellite are input. Reference numeral 302 denotes a tuner unit, in which radio waves in the RF band are frequency-converted to an IF band (Intermediate Frequency), and output to the demodulator 303 as a signal in a certain band independent of the reception channel. The demodulation unit 303 demodulates a modulation operation performed for transmission on the bit stream input from the tuner unit 302. The error correction unit 304 detects and corrects a code error that occurs during transmission, and then outputs it to the filtering unit 304. The filtering unit 305, after canceling the transmission cipher for the MPEG2-TS input from the error correction unit 304, selects one transponder frequency in which a program for recording on the recording medium 6 is multiplexed, and this selected The bit stream in one transponder is separated into audio and video packets of one program. Reference numeral 306 denotes a time stamp adding unit. In order to maintain a packet interval at the time of reception in a timing adjustment unit 307, which will be described later, even during reproduction, a PTS (Presentation Time Stamp) that is time management information from the received packet, An STC (System Time Clock) inside a standard decoder of the MPEG system is detected, and a time stamp is added at a timing corrected by the detection result, and the MPEG2-TS with the time stamp added is converted into a digital information recording / reproducing apparatus 100. To the input terminal 1 and encrypted and recorded on the recording medium 6.

  At the time of reproduction, the TS packet decoded from the output terminal 12 of the digital information recording / reproducing apparatus 100 is received, the timing adjusting unit 307 refers to the added time stamp, and the PTS which is the time management information of reproduction output is the STC. When they match, the access unit is played back. The output of the timing adjustment unit 307 is supplied to an AV decoder 308. The AV decoder 308 decodes the input audio and video packet data, and the video data is output to the digital encoder 309 and the audio data is output to the audio DAC 311. To do. The digital encoder 309 converts the video data received from the AV decoder 308 into a television output signal and outputs it to the outside via the output terminal 310. The audio DAC 311 converts the audio data received from the AV decoder 308 into an analog signal and outputs it to the outside via the output terminal 312. The output terminal 12 detects copy management information in the second control signal detection unit 313 and converts “Copy One Generation” to “Copy No More” in order to move content to the second recorder or recording medium. Then, the content encrypted by the second encryption control unit 314 is supplied to the digital interface control unit 315, and the content is moved to the second recorder or recording medium connected to the output terminal 316. is there.

  In this configuration, as described in the first embodiment, “Copy One Generation” digital broadcast content is recorded on, for example, a hard disk, which is the first recording medium of the recorder 1000, and after being recorded on the hard disk, “Copy No. While being handled as “More” content, a removable second recorder or recording medium such as DVHS, an optical disc, a memory card, or the like can have a move function with a limited number of times. Therefore, the copyright can be protected for the copyright holder of the content. In addition, for the user, the same content can be moved to other recording media within the specified number of times, and since the content exists in the recording / playback apparatus even after the move, viewing is possible and usability is improved. In addition, since a plurality of identical contents are not prepared, the capacity of the hard disk can be used effectively.

  Even if a second recording control unit is provided instead of the digital interface control unit 315, it is possible to perform a limited number of moves on other recording media. In addition, since the move destination is encrypted, copyright protection can be realized.

5). Configuration for Making a Copy in Advance and Moving and Deleting Next, FIG. 7 is used to explain an embodiment in which content for moving is generated in advance when content is recorded, and the moving content is deleted when the move is executed. About the same function, the same code | symbol is used and description is abbreviate | omitted.

  In the figure, reference numerals 15 and 16 denote encoders, which encode the input content at a compression rate that matches the recording capacity of the second and third recording media connected to any one of the output terminals 12, 18, and 19. To do.

  For example, the compression rate is down-converted from a high definition (High Definition, hereinafter referred to as HD) method such as high definition broadcasting in digital broadcasting to optimize the recording capacity. Plan. The encoding method is not limited to this, but MPEG4 or H.264. An H.264 encoder can also convert the bit rate to match the recording medium. The first and second encoders 15 and 16 compress the signal from the control signal detection unit 2 and output it to the switching unit 3. The control unit 10 switches the switching unit 3 to time division, and supplies the output of the control signal detection unit 2 and the encoders 15 and 16 to the recording control unit 4 via the encryption control unit 13. The stream buffered in the memory 9 is recorded on the recording medium 6 while being buffered in the memory 9 as needed.

  According to this configuration, the content at the time of reception, the second content compressed by the first encoder, and the third content compressed by the second encoder can be recorded on the recording medium 6 for the same content. .

  FIG. 8 is an example showing the management information area 501 and the data area 502 of the recording medium 6. In the management information area 501, three files with different bit rates, file number 0_1, file number 0_2, and file number 0_3 are generated for the same content. The number of copies is set to “1” because the move is permitted only once. Based on the bit rate of this management information, for example, the contents for card, the contents for optical disk, the contents for IEEE 1394 and the user are displayed, the contents for card are allocated to the output terminal 18, and an interface for recording on the card is provided. For example, an ATAPI interface for assigning contents for output to the output terminal 19 and recording on an optical disk is provided, and an IEEE1394 interface for assigning contents for IEEE1394 to the output terminal 12 and the AV decoder 308 and recording to a D-VHS recorder or the like. The user can display and select a function that does not require detailed settings during the move.

  Conversely, the bit rate of the encoder 15 and / or the encoder 16 can be arbitrarily set by the user, so that the content of the bit rate more suitable for the recording medium connected to the output terminals 12, 18, and 19 can be obtained. And the capacity of the recording medium 6 and the move execution speed can be optimized.

  Also, by setting the encoder 15 and the encoder 16 to the same compression ratio, it is possible to generate two contents with the same compression rate.

  Further, by deleting the encoders 15 and 16 and switching each of them with the switching unit 3, three contents having the same compression rate can be generated.

  6). Explanation of Operation Next, the operation of moving the content recorded on the recording medium 6 will be described with the file number 1-2 as the object to be moved.

  When the content is moved, the control unit 10 reads the management information area 501 from the recording medium 6. FIG. 15 shows an example of an operation screen for a user to operate by connecting a decoder, a monitor and the like to the output terminal 12 of the digital information recording / reproducing apparatus 100. In the figure, (a) is a view showing a list of recorded contents, (b) is a view showing a screen for confirming a file that can be moved from (a), and (c) is further changed from (b). And (d) is a diagram showing a screen from which (d) further transitions from (c) and the moved recording mode is deleted, and (e) is further permitted. Shows a screen where content has been removed from the title after a number of moves.

  When the user executes “move”, the control unit 10 first reads the management information area 501 recorded in the recording medium 6 and displays (a) a screen. When the user selects the title “BBBBB” corresponding to the file number 1, (b) transitions to the screen and displays a file with a bit rate that can be moved.

  Next, when the file “LP mode” to be moved is selected, the screen changes to (c) screen, and the move destination is determined to be “memory card”, for example. When the transition to the move is executed, the number-of-moves-information update unit 11 refers to the number of moves 509 in the management information area 501 and changes it to “1” and holds it. Further, the control unit 10 supplies management information of the file number 1-2 from the reproduction control unit 7 to the disabling control unit 8, performs arithmetic processing such as rewriting all addresses 504 to “1”, and further moves After the value of the number of times 509 is replaced with the value of the number-of-moves information update unit, the result is held.

  When the setting is completed, the move is started, and the reading of the content for the designated size is started from the head address recorded at the address 5. At this time, the playback control unit 7 changes the copy management information of the content to be moved to “Copy One Generation”.

  The reproduced content is decrypted and output from the output terminal 12. When the reproduction for the specified size is completed, the calculation result of the file number 1-2 held in the disabling control unit 8 is written into the management information area of the file number 1-2 by the recording control unit 4.

  As a result, the (d) screen from which the “LP mode” has been deleted is displayed. Further, when the “SP mode” is moved, the screen (e) is displayed, and the title “BBBBB” corresponding to the file number 1 is deleted.

  In the above configuration, the copy generation control signal can record the “Copy One Generation” content, and the “Copy No More” content can be realized as a recording / playback device that limits the number of times the same content with different bit rates is moved. Copyright holders can be protected. Also, the user can move the same content with an appropriate bit rate to other recording media within the specified number of times, and the content can be viewed even after the move because the content exists in the recording / playback device. Become. Furthermore, since the content to be moved has already been generated at the time of recording, the time required for the move can be shortened and the usability is improved.

7). Recorder Application Example FIG. 9 is a block diagram showing an embodiment in which the digital information recording / reproducing apparatus of the third embodiment is applied to a digital broadcast recorder.

  An optical disk is connected as a second recording medium to the recording control unit 319, a memory card is connected as a third recording medium to the recording control unit 323, and a fourth recording medium is connected to the output terminal 316 of the digital interface control unit 315. It is assumed that a D-VHS recorder having an IEEE1394 interface is connected.

  According to this configuration, each recording medium can be moved once, and the content to be output to the output terminals 12, 18, and 19 can be switched by the playback control unit so that the same content is stored on the same recording medium. It is also possible to move twice.

  The copy generation management information is output from the output terminals 12, 18, and 19 as "Copy No More" to "Copy One Generation" in the reproduction control unit. The control signal detection units 313, 317, and 321 detect the copy generation control signal, change from “Copy One Generation” to “Copy No More”, and record the content on each recording medium. Here, when the digital information recording / reproducing apparatus 100 and other components are integrated, for example, an LSI (Large Scale Integrated Circuit), the control signal detection units 313, 317, and 321 are omitted, and the copy generation control signal is transmitted. You may move it with “Copy No More”. According to the configuration of the previous period, the circuit can be simplified and the cost of the LSI can be reduced.

  A recording / playback device that limits the number of moves of the same content with different bit rates, in which the copy generation control signal records “Copy One Generation” content and becomes “Copy No More” content by configuring the digital broadcast recorder as described above. Therefore, the copyright can be protected for the copyright holder of the content. In addition, for the user, it is possible to move the same content at an appropriate bit rate to other recorders and recording media within the specified number of times, and since the content exists in the digital broadcast recorder even after the move, Can be viewed. Furthermore, since the content to be moved is already generated at the time of recording, the time required for the movement can be shortened, and the usability of the digital broadcast recorder is improved.

8). Count down the number of moves. A copy is made at the same time as the move, but the user sees only the remaining rights.

  Next, with reference to FIGS. 10 and 14, an embodiment will be described in which content to be moved is generated in advance, the moving content is re-recorded when the move is executed, and the user is notified only of the number of times that the move is possible.

  FIG. 16 shows an example of an operation screen for a user to operate by connecting a decoder, a monitor and the like to the output terminal 12 of the digital information recording / reproducing apparatus 100. In the figure, (a) is a view showing a list of recorded contents, (b) is a view showing a screen for confirming a file that can be moved from (a), and (c) is further changed from (b). And (d) is a diagram showing a screen from which (d) further transitions from (c) and the moved recording mode is deleted, and (e) is further permitted. Shows a screen where content has been removed from the title after a number of moves.

  The signal switched by the switching unit 3 in FIG. 10 is configured to switch the four streams from the control signal detection unit 2, the encoder 15, the encoder 16, and the decoding control unit 14. The output of the switching unit 3 is recorded on the recording medium 6 while the content is sequentially encrypted by the encryption control unit 13 and buffered in the memory 9 by the recording control unit 4. As the encryption key at this time, the copyright of the content can be protected regardless of whether the encryption key is common to the same content or different values.

  Further, by using the value of the move count information update unit 11 as one of the key information and changing the value every time the move is executed, it is possible to obtain an effect of further increasing the strength for content protection of the entire system. In recording content, the encoder 15 and the encoder 16 generate content with different bit rates and generate three file numbers in common with the third embodiment. Here, at the time of the move execution, the switching unit 3 is set to the output from the decryption control unit 7, the content to be moved is re-encrypted and recorded on the recording medium 6, and the number of moves 509 recorded in the management information area 501. And the copy information 508 are shared between the same contents having different rates.

  In this method, the user is prompted to make a determination by displaying the number of times the content can be moved and the rate of the content to be moved, as shown on the screen (b). When the move is completed, the screen (c) is displayed, and the possible number of moves is subtracted.

  In the next move, (d) screen is displayed and the number of moves is reduced to 1. However, since the contents of the respective bit rates exist in the recording medium 6, "SP mode" and "LP mode" Either of these can be selected.

  When the permitted number of times of movement becomes “0”, all the management information is made unreproducible by the disabling control unit 8 and (e) the screen is deleted from the title.

  FIG. 11 is a diagram showing a management information area 501 and a data area 502 recorded on the recording medium 6. In this example, the copy information 508 and the number of moves 509 are made common in content units. At the time of reproduction, the content of the bit rate selected by the user is reproduced, and every time the move is completed, the common number of times of movement 509 is subtracted, and when the number of times of movement 509 becomes “0”, the management information area Delete from 501.

  In the above configuration, the copy generation control signal can record the “Copy One Generation” content, and the “Copy No More” content can be realized as a recording / playback device that limits the number of times the same content with different bit rates is moved. Copyright holders can be protected. In addition, the user can move the same content with the same or different bit rate to other recording media within the specified number of times, and the content exists in the recording / playback device even after the move. It becomes possible. Furthermore, since the content to be moved is generated at the time of recording, the time required for the move can be shortened. Furthermore, since the bit rate content once moved is recorded again, the content with the same bit rate can be moved a plurality of times within a specified number of times. Further, the bit rates of the encoder 15 and the encoder 16 can be arbitrarily set by the user and can be set in advance to the capacities optimized for the second and third recording media, which improves usability.

  9. Recorder Application Example FIG. 12 shows an embodiment in which the digital information recording / reproducing apparatus of the fifth embodiment is applied to a digital broadcast recorder. The output terminal 12 outputs contents for display on the display and for moving to the second recording medium. The output terminal 18 outputs a bit rate converted content to be moved to the third recording medium. In addition, the output terminal 19 outputs a bit rate converted content to be moved to the fourth recording medium. The content to be moved is recorded on the recording medium 6 again by the switching unit 20 and the switching unit 3, and only the copy number information is subtracted. Therefore, for example, even if the content whose bit rate has been converted from the output terminal 12 is moved, if the copy count information is not “0”, the content having the same bit rate can be moved again thereafter.

  With the digital broadcast recorder of the above configuration, the copy generation control signal records “Copy One Generation” content and realizes a digital broadcast recorder that limits the number of moves of the same content with different bit rates as “Copy No More” content. Therefore, the copyright can be protected for the copyright holder of the content. In addition, the user can move the same content with the same or different bit rate to other recording media within the specified number of times, and the content exists in the recording / playback device even after the move. It becomes possible. Furthermore, since the content to be moved is generated at the time of recording, the time required for the move can be shortened. Furthermore, since the bit rate content once moved is recorded again, the content with the same bit rate can be moved a plurality of times within a specified number of times. In addition, since the bit rates of the encoder 15 and the encoder 16 can be arbitrarily set by the user and can be set in advance to capacities optimized for the second and third recording media, the usability of the digital broadcast recorder is improved.

  Also, even when recording on the second, third, and fourth recording media, encryption control units 314, 319, and 323 adapted to the respective formats are added and encrypted so that the copyright of the content can be protected even at the move destination. Make it possible.

10. Implementation of Downconversion at Off Time Next, with reference to FIG. 13, a description will be given of an embodiment in which the recorded content is downconverted and the moving content is generated at the off time when recording / reproduction is not operating.

  A switching unit 21 is newly provided at the input of the encoder 15 so that one of the outputs of the control signal detection unit 2 and the decoding control unit 14 is input. Normally, the switching unit 21 selects the control detection unit 2 and performs compression processing on the bit rate specified by the user. In the switching unit 3, one of the outputs of the encoder 15 and the control signal detection unit 2 is recorded on the recording medium 6. Here, the control unit 10 is activated during a time when the timer recording is not set or during a time zone set by the user (for example, midnight), plays the content recorded in the recording medium 6, and decodes the switching unit 21. A limited number of identical contents that have been switched to the control unit 14 and converted into bit rates are generated. Each time reproduction for bit rate conversion is executed, a new file number 503 is added to the management information area 501, and a file for movement corresponding to the permitted number of copies is generated. When a move is executed at the time when the file has not been generated for the permitted number of copies, the number of generation of the move file is automatically subtracted and managed so as not to exceed the permitted number.

  According to this configuration, since the copy generation control signal records “Copy One Generation” content, and a recording / playback device that limits the number of times the content that has become “Copy No More” content can be realized, the copyright holder of the content Can protect the copyright. In addition, the user can move the same content with the same or different bit rate to other recording media within the specified number of times, and the content exists in the recording / playback device even after the move. It becomes possible. Furthermore, since the content to be moved is generated in a time zone not used by the user, the time required for the move can be shortened. Furthermore, since the bit rate content once moved is re-recorded, the same bit rate content can be moved a plurality of times within a specified number of times, improving usability.

  Further, by using one encoder 15, the cost of the LSI or the recording / reproducing apparatus can be reduced.

11. 17 shows an example of a recorder that plays back and records content recorded on a DVD or the like. FIG. 17 shows a digital information recording / playback apparatus according to the fourth embodiment that plays back content recorded on, for example, an optical disk as the second recording medium 320. This is an example of recording on the recording medium 6.

  It is assumed that a copy generation control signal is recorded in advance as “Copy One Generation” in the recorded content by the manufacturer of the recording medium 320.

  When the recording medium 320 is inserted into the tray of the recorder 1000 and a signal indicating that the recording start is selected by the user is input to the input / output unit 25, the playback control unit 325 plays the content from the recording medium 320. The decrypted control unit 326 decrypts the encrypted content and supplies the decrypted content to the input terminal 1.

  With this configuration, it is possible to specify the number of moves even for content recorded on an optical disc or the like intended for reproduction only, and the usability of the recorder 1000 can be improved.

  FIG. 18 shows an embodiment in which the content recorded on the second recording medium 320, for example, an optical disc, is reproduced and recorded on the first recording medium 6 in the digital information recording / reproducing apparatus of the fifth embodiment.

  Also in this configuration, it is possible to define the number of moves for the content recorded on the recording medium 320, and the usability of the recorder 1000 is improved.

  Here, the content input to the input terminal 1 of the recorder 100 shown in FIGS. 17 and 18 may be switched between the digital broadcast and the recording medium 320.

  The same effect can be obtained even if the recording medium 324 and the recording medium 320 can be selected as the recording medium to be reproduced.

12 Example of Relationship between Digital Broadcasting Operation and Recorder Next, the entire digital broadcasting system to which the above embodiment is applied will be described with reference to FIGS.

  FIG. 19 is a block diagram showing an embodiment of the entire system used in the present invention, and shows an example in which information is transmitted / received by broadcasting and recorded / reproduced. This includes the digital information recording / reproducing apparatus of the present invention. Reference numeral 601 is an information providing station such as a broadcasting station, 602 is a relay station, 1000 is a recorder including a digital information recording / reproducing apparatus, 604 is a display, and 605 is a second recording / reproducing apparatus. Here, when recording a broadcast or the like, it can be recorded on either or both of the first recording medium 6 and the second recording / reproducing apparatus 605 included in the digital information recording / reproducing apparatus.

  An information providing station 601 such as a broadcasting station transmits a signal radio wave modulated by information via a relay station 602 such as a broadcasting satellite. Of course, other transmissions such as cable transmission, telephone line transmission, and terrestrial broadcast transmission may be used. This signal radio wave received by the recorder 1000 on the receiving side is demodulated into an information signal, and then a signal suitable for recording on the first recording medium 6 or the second recording / reproducing device 605 as necessary. Will be recorded. Also, it is sent to the display 604. Here, the user can directly view the information content.

  Information reproduced by the first recording medium 6 and the second recording / reproducing apparatus 605 is given to the display 604 via the recorder 1000, and the original information such as video and audio is viewed. When a removable recording medium on which information has been recorded in advance is provided, the reproducing operation and the like in the second recording / reproducing apparatus 605 to which the removable recording medium is attached, for example, is performed. Information is often exchanged between devices using digital signals. For example, the recorder 1000 and the display 604 may be connected using analog signals.

  FIG. 20 is a block diagram illustrating a configuration example of an information providing station 601 such as a broadcasting station in the above system. Reference numeral 701 denotes a source generation unit, 702 denotes an encoding circuit that performs compression by the MPEG method, 703 denotes a scramble circuit, 704 denotes a modulation circuit, 705 denotes a transmission antenna, 706 denotes a management information addition circuit, and 707 denotes an input terminal. Information such as video and audio generated by the source generation unit 701 including a camera and a recording / playback device is compressed by the encoding circuit 702 so that it can be transmitted in a smaller occupied band. If necessary, the scramble circuit 703 performs transmission encryption so that only a specific viewer can view. After being modulated by the modulation circuit 704 to be a signal suitable for transmission, the signal is emitted from the transmission antenna 705 as a radio wave toward a relay station 602 such as a broadcasting satellite. At this time, the management information adding circuit 706 adds information such as the current time including the copy control information described above. Further, for example, request information is input from the input terminal 707 via a telephone line, which is omitted in FIG. This is utilized in a system for determining information to be transmitted in response to a viewer's request such as video on demand. In practice, a plurality of information is often multiplexed in one radio wave by a method such as time division or spread spectrum.

  Although not shown in FIG. 20 for simplicity, in this case, there are a plurality of systems of the source generation unit 701 and the encoding circuit 702, and a multiplex for multiplexing a plurality of information between the encoding circuit 702 and the scramble circuit 703. A circuit is placed. In the management information adding circuit 706, the digital broadcast operator can specify the number of times of moving the content, thereby limiting the number of times the digital information recording / reproducing apparatus 1000 moves the content. It is possible to operate a digital broadcasting system that protects the right and allows the user to move the same content a plurality of times within the number of times set on the digital broadcasting station side, thereby improving usability.

  In FIGS. 19 and 20, information is transmitted from the transmission antenna via the relay station, but the present invention is not limited to this. For example, the information providing station may be a server, and the server to the digital information recording / reproducing apparatus may be connected via the Internet.

  Needless to say, the combination of the above embodiments is one of the embodiments of the present application.

1 is a block diagram showing an embodiment of a digital information recording / reproducing apparatus according to a first embodiment of the present invention. It is a figure which shows the structure of the recording management information which concerns on the 1st Embodiment of this invention. The block diagram which shows the structural example of the encryption control part which concerns on the 1st Embodiment of this invention. The block diagram which shows the structural example of the decoding control part which concerns on the 1st Embodiment of this invention. The block diagram which shows the structural example of the key generation part which concerns on the 1st Embodiment of this invention. The block diagram which shows one Embodiment of the whole digital information recording / reproducing apparatus concerning the 2nd Embodiment of this invention. The block diagram which shows one Embodiment of the digital information recording / reproducing apparatus which concerns on the 3rd Embodiment of this invention. It is a figure which shows the structure of the recording management information which concerns on the 3rd Embodiment of this invention. The block diagram which shows one Embodiment of the whole digital information recording / reproducing apparatus concerning the 4th Embodiment of this invention. The block diagram which shows one Embodiment of the digital information recording / reproducing apparatus which concerns on the 5th Embodiment of this invention. It is a figure which shows the structure of the recording management information which concerns on the 5th Embodiment of this invention. The block diagram which shows one Embodiment of the digital information recording / reproducing apparatus which concerns on the 6th Embodiment of this invention. The block diagram which shows one Embodiment of the digital information recording / reproducing apparatus which concerns on the 7th Embodiment of this invention. The figure which shows one Embodiment of the operation screen which concerns on the 1st Embodiment of this invention. The figure which shows one Embodiment of the operation screen which concerns on the 3rd Embodiment of this invention. The figure which shows one Embodiment of the operation screen which concerns on the 5th Embodiment of this invention. The figure which shows one Embodiment of the digital information recording / reproducing apparatus which concerns on the 7th Embodiment of this invention. The figure which shows one Embodiment of the digital information recording / reproducing apparatus which concerns on the 7th Embodiment of this invention. The figure which shows one Embodiment of the digital broadcasting which concerns on the 8th Embodiment of this invention. The figure which shows one Embodiment of the information provision station which concerns on the 8th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,206,209,301,607 ... Input terminal 2, 313, 317, 321 ... Control signal detection part 3, 20, 21 ... Switching part 4, 319, 323 ... Recording control part 5, 17, 24 25, 315... I / O unit, 6, 320, 324... Recording medium, 7, 325... Playback control unit, 8. 12, 18, 19, 208, 211, 310, 312 ... output terminals, 13, 314, 318, 322 ... encryption control unit, 14, 326 ... decryption control unit, 15, 16 ... encoder, 22 ... bus, 23 ... remote control Interface control unit, 100, 605... Recording / playback device, 201, 202, 203, 204, 506... Key information, 205... Key generation unit, 207. Demodulation unit 304 ... error correction unit 305 ... filtering unit 307 ... timing adjustment unit 308 ... AV decoder 309 ... digital encoder 311 ... audio DAC 314 ... digital interface control unit 400 ... user operation screen 401 ... Title field, 402 ... Recording date / time field, 403 ... Recording mode field, 404 ... Move enable / disable field, 405 ... Move destination setting field, 501 ... Management information area, 502 ... Data area, 503 ... File number, 504 ... Date information, 505 ... Address, 507 ... Bit rate designation, 508 ... Copy information, 509 ... Number of copies, 510 ... Content, 601 ... Information providing station, 602 ... Relay station, 604 ... Display, 605 ... Transmission antenna, 606 ... Management information adding unit, 1000 ... Recorder

Claims (2)

In a digital information recording / reproducing apparatus for receiving digital information including control information and recording / reproducing the received digital information on a recording medium,
The control information includes at least copy control information indicating whether the digital information can be copied, only one generation can be copied, or copy prohibition, and second control information regarding permission for multiple copies,
Receiving means for receiving the digital information;
Detecting means for detecting the control information from the received digital information;
Recording / reproducing means for recording / reproducing the received digital information on the recording medium;
A digital interface for outputting digital information reproduced from the recording medium by the recording and reproducing means;
Control means for controlling the recording / reproducing means and the digital interface according to the detected control information,
The control means, when the copy control information included in the received digital information can be copied for only one generation, and the second control information indicates that a predetermined number of copies are permitted. , when recording the digital information to the recording medium, the digital information subjected to the digital information recording and reproducing apparatus specific encryption, different from the copy control information, limits the number of copies of the digital information together with the third control information is recorded on the recording medium, wherein the recording medium recorded by reproducing the digital information when copying via the digital interface, different second and the device specific encryption from the digital interface is subjected to encryption, the same copy system and the copy control information included in the digital information received The number of copies to be output by outputting only one generation that is in a state and being output that only one generation can be copied from the digital interface, and a plurality of copies that are output by allowing only one generation to be copied from the digital interface When the number of copies reaches the predetermined number, the digital information recorded on the recording medium is made unreproducible when copying is performed by outputting only one generation from the digital interface . A digital information recording / reproducing apparatus for performing control for managing copies from the recording medium via the digital interface to the predetermined number or less. In a digital information recording / reproducing method in a digital information recording / reproducing apparatus for receiving digital information including control information, recording / reproducing the received digital information on a recording medium, and outputting from the digital interface,
The control information includes at least copy control information indicating whether the digital information can be copied, only one generation can be copied, or copy prohibition, and second control information regarding permission for multiple copies,
When the copy control information included in the received digital information can be copied for only one generation, and the second control information indicates that a predetermined number of copies are permitted,
When recording the digital information to the recording medium, first the digital information subjected to the digital information recording and reproducing apparatus specific encryption, different from the copy control information, limits the number of copies of the digital information 3 on the recording medium together with the control information of 3 ,
Wherein the recording medium recorded by reproducing the digital information when copying via the digital interface from the digital interface is subjected to different second encryption and the device specific encryption, received the Managing the number of copies to be output by outputting only one generation in the same copy control state as the copy control information included in the digital information and allowing only one generation to be copied from the digital interface ,
When the number of copies reaches the predetermined number by performing a plurality of copies that are output from the digital interface as being allowed to copy only one generation, the copy is performed when only one generation is allowed to be copied from the digital interface. Making the digital information recorded on the recording medium unplayable when
A digital information recording / reproducing method characterized by managing copies from the recording medium via the digital interface to the predetermined number or less.

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