WO2008072497A1 - コンテンツ判定装置、コンテンツ判定方法、情報再生装置、情報再生方法、及び情報記録媒体 - Google Patents
コンテンツ判定装置、コンテンツ判定方法、情報再生装置、情報再生方法、及び情報記録媒体 Download PDFInfo
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- WO2008072497A1 WO2008072497A1 PCT/JP2007/073314 JP2007073314W WO2008072497A1 WO 2008072497 A1 WO2008072497 A1 WO 2008072497A1 JP 2007073314 W JP2007073314 W JP 2007073314W WO 2008072497 A1 WO2008072497 A1 WO 2008072497A1
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- content
- decryptor
- video
- encrypted
- decryption
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- 238000000034 method Methods 0.000 title claims abstract description 106
- 238000012545 processing Methods 0.000 claims abstract description 37
- 230000008569 process Effects 0.000 claims description 66
- 238000001514 detection method Methods 0.000 claims description 45
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- 238000012986 modification Methods 0.000 description 13
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- 238000012544 monitoring process Methods 0.000 description 6
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- 241000849798 Nita Species 0.000 description 1
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- 238000007796 conventional method Methods 0.000 description 1
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- 230000007246 mechanism Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
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- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
- G11B20/00884—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a watermark, i.e. a barely perceptible transformation of the original data which can nevertheless be recognised by an algorithm
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- G—PHYSICS
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- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
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- G—PHYSICS
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- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
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- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
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- G—PHYSICS
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- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
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- G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
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- H04L9/10—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols with particular housing, physical features or manual controls
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- H04N5/85—Television signal recording using optical recording on discs or drums
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- H04N2005/91328—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal the copy protection signal being a copy management signal, e.g. a copy generation management signal [CGMS]
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- H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
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- H04N9/8205—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only involving the multiplexing of an additional signal and the colour video signal
Definitions
- Content judging device Content judging method, information reproducing device, information reproducing method, and information recording medium
- the present invention relates to a content determination device, a content determination method, an information reproduction device, and an information reproduction device capable of determining whether or not digital content such as video and music has been abnormally processed.
- the present invention relates to an information recording medium to be reproduced.
- Serial 'copy management' system S CMS
- copy generation to prevent illegal copying of information from one information recording medium to another (for example, piracy)
- Copy guard technology such as 'management' system (CGMS)
- CGMS 'management' system
- 2-bit copyright protection information is recorded on an information recording medium and the copyright protection information is “00”, copying is possible, “10” is copying only once, and “11” is copying. Indicates copy prohibition.
- the information recording device complies with the copyright protection information recorded on the information recording medium. However, the copyright protection information recorded on the information recording medium can be altered illegally.
- a technique for encrypting content is generally used in copyright protection technology for digital content.
- the data to be protected is encrypted, and the signal key necessary for decrypting the encrypted data and the reproduction control data for copyright protection are digital watermarks. Embed in encrypted data.
- the encryption key necessary for detecting the digital watermark and decrypting the encrypted data and the playback control data for copyright protection are restored, and the recovered encryption key is used for encryption. Decrypted and restored with playback control data
- the reproduction of the data to be controlled is controlled (for example, see Patent Document 2).
- Patent Document 1 Japanese Unexamined Patent Publication No. 2006-87096
- Patent Document 2 Japanese Unexamined Patent Publication No. 2003-195759
- the strength of concealing the key decryption procedure for decrypting the cipher is the strength corresponding to the strength of protection.
- the present invention has been made to solve the above-mentioned problems of the prior art, and its purpose is to determine whether or not digital contents such as video and music are abnormally processed. It is an object of the present invention to provide a content determination device, a content determination method, an information reproduction device, and an information recording medium that can be determined.
- an information reproducing apparatus capable of determining whether digital content such as video and music is illegally decrypted and preventing the illegally decrypted content from being normally reproduced, And providing an information reproducing method.
- the content determination apparatus of the present invention when content including an electronic watermark indicating an attribute of whether or not the content is encrypted is encrypted, the encrypted stream of the content is A decryptor for decoding; a decryptor state monitor for generating a decoding state signal indicating whether or not the decryptor is performing a decoding process; a stream attribute monitor for generating an attribute detection signal indicating the attribute from the digital watermark; and the decoding state signal Indicates that the content is not being decrypted and the attribute detection signal is encrypted content, or if the decryption status signal indicates that the decryption processing is in progress and the attribute detection signal is decrypted. , NA! /, Having a determination means for determining that the content is abnormally processed when indicating content A.
- the content determination method of the present invention is an attribute of whether or not the content is encrypted.
- the attribute detection signal is encrypted and indicates that the content is a content
- a step for determining that the content has been abnormally processed when the attribute detection signal is encrypted and indicates that the content is a content.
- the information reproducing apparatus of the present invention provides reproducing means for reading out the content from the information recording medium on which the content including the electronic watermark indicating whether the content is encrypted is recorded. And a decryptor status monitor that generates a decryption status signal indicating whether or not the decryptor is in a decryption process when the content is encrypted.
- a stream attribute monitor that generates an attribute detection signal indicating the attribute from the digital watermark, and that the decryption status signal indicates a content other than being decrypted and the attribute detection signal is encrypted.
- the decryption status signal indicates that the decryption process is in progress and the attribute detection signal is encrypted.
- a determination unit that determines that the content is abnormally processed, and a video decoder that decodes the content stream output from the playback unit or the descriptor and outputs the decoded content as a video signal. It is what you have.
- the information recording medium of the present invention is an information recording medium reproduced by the information reproducing apparatus, and includes an electronic watermark indicating an attribute of whether or not the recorded content power is encrypted.
- the information reproducing apparatus of the present invention receives a decryptor for decrypting encrypted stream information representing encoded and encrypted video and audio, and an internal signal of the decryptor to receive the decryptor.
- Decryptor state that generates a decoding state signal indicating whether or not the decoding process is in progress
- a decoder and a decoder that decodes the encoding of the stream information are provided, and the decoder is normally decoded only when the decoding status signal indicates that the decoding process is in progress.
- another information reproducing apparatus of the present invention receives a decryptor that decodes encryption of stream information that represents encoded and encrypted video and audio, and an internal signal of the decryptor,
- a decryptor status monitor for generating a decoding status signal indicating whether or not the decryptor is in the process of decoding;
- a decoder for decoding the encoding of the stream information;
- output means for outputting the stream information decoded by the decoder
- the stream information decoded from the output means is normally output only when the decoding status signal indicates that the decoding process is in progress.
- the content determination device According to the content determination device, the content determination method, and the information reproduction device of the present invention, it is possible to determine whether the content is normal or abnormally processed.
- the information recording medium of the present invention it is possible to determine whether the content is normal or abnormally processed.
- FIG. 1 is a block diagram schematically showing a configuration of an information reproducing apparatus according to Embodiment 1 of the present invention.
- FIG. 2 is an explanatory diagram showing content determination and an output video signal in the information reproducing apparatus according to Embodiment 1.
- FIG. 3 is a block diagram schematically showing a configuration of an information reproducing apparatus according to Embodiment 2 of the present invention.
- FIG. 4 is an explanatory diagram showing content determination and an output video signal in the information reproducing apparatus according to Embodiment 2.
- FIG. 5 is a block diagram showing a configuration of an information reproducing apparatus according to Embodiment 3 of the present invention.
- FIG. 6 is an explanatory diagram for determining the state of content copyright protection in the information reproducing apparatus according to Embodiment 3.
- FIG. 7 is a block diagram showing a configuration of an information reproducing apparatus according to Embodiment 4 of the present invention.
- FIG. 8 is a block diagram showing a configuration of an information reproducing apparatus according to Embodiment 5 of the present invention.
- FIG. 9 is a block diagram showing a configuration of an information reproducing apparatus according to Embodiment 6 of the present invention. Explanation of symbols
- 100 controller 101 information recording medium, 102 drive, 103 decryptor, 104 decryptor status monitor, 105 video decoder, 106, 116 stream attribute monitor, 107, 117 judgment means, 108, 118 output control means, 109, 110 Content judgment block, 120 circuit block, 1 information recording medium, 2 drive, 3 decryptor, 4 decryptor status monitor, 5 video decoder, 6 playback controller, 7 system controller, 8 output control means, 9 content decoder, 10 Content decoder, 11 Versa, 12 Video buffer, 13 Video encryption decryptor, 14 Video encryption decryptor status monitor, 15 Video decoder, 16 Video encryption / decryption status signal, 18 Video output control means, 19 Video content decoder, 22 Audio Buffer, 23 voice encryption decryptor, 24 voice encryption decryptor status Nita, 25 voice decoder, Da audio decryption status signal, 28 audio output control unit, 29 voice content decoder, 32 control buffer.
- FIG. 1 is a block diagram schematically showing the configuration of the information reproducing apparatus according to Embodiment 1 of the present invention.
- the information reproducing apparatus receives video and / or audio from the information recording medium 101 on which digital content including an electronic watermark indicating an attribute indicating whether or not the information reproducing apparatus is encrypted is recorded. Play.
- the information recording medium 101 is, for example, a DVD or a CD Optical disk or memory card. Encryption is applied for copyright protection to prevent unauthorized reproduction or reproduction of digital content such as video and audio without the proper right!
- CPRM Content Protection for Recordable Media
- AACS Advanced Access Content System
- the information reproducing apparatus includes a controller 100 that controls the operation of the entire apparatus, and a drive 102 as reproducing means for reading content from the information recording medium 101.
- a decryptor 103 that decrypts (decrypts) the encrypted stream of the content
- a decryptor status monitor that generates a decryption status signal indicating whether or not the decryptor 103 is performing a decryption process.
- the decryption status signal is indicated by E when the decryptor 103 is in the process of decryption, and decryptor 3 performs the decryption process.
- N The content is played in advance when authoring.
- the attribute is embedded in the content stream using an electronic watermark, for example.
- the information reproducing apparatus decodes the content stream output from the drive 102 or the decryptor 103 (decodes the encoded data) and outputs it as a video signal 105. And a stream attribute monitor 106 that generates an attribute detection signal indicating an attribute from the digital watermark.
- the attribute detection signal is indicated by E when the digital watermark is encrypted, and when the digital watermark is not encrypted.
- the information reproducing apparatus indicates that the decryption state signal is other than being decrypted (N) and that the attribute detection signal is encrypted content (E).
- the decryption status signal indicates that decryption is in progress (E) and the attribute detection signal is encrypted.
- the information reproducing apparatus does not cause the video signal from the video decoder 105 to be output to the outside when the determining unit 107 determines that the content has been abnormally processed.
- Output control means 108 is provided.
- “decryption” executed by the decryptor 103 indicates a process of decrypting the encrypted data for copyright protection
- “decoding” executed by the video decoder 105 Indicates the process of converting the encoded data into the original data.
- the decryptor 103, the decryptor status monitor 104, the stream attribute monitor 106, and the determination means 107 are the content determination device according to Embodiment 1 of the present invention (ie, the implementation A content determination block 109 corresponding to a content determination method according to aspect 1 is configured. A display or warning sound based on the determination result in the content determination block 109 may be output from a display unit or a speaker (not shown).
- FIG. 2 is an explanatory diagram showing content determination conditions and output video in the information reproducing apparatus according to the first embodiment.
- the content encryption state (non-sign N or sign E), decryption
- the content is not originally encrypted, and both the decryption status signal and the attribute detection signal indicate that the content is encrypted! / ,! I can guess that. Since the judging means 107 indicates that both the decryption state signal and the attribute detection signal are not encrypted (N and N), the content is illegally processed.
- the output control means 108 Based on the determination result of the stage 107, the output signal of the video decoder 105 is output as a video signal as it is.
- the decryption status signal indicates that the content is encrypted! /, Na! /
- the attribute detection signal indicates that the content is encrypted. Therefore, it can be assumed that the content has been altered illegally (for example, the content has been illegally decrypted into plain text).
- the judging means 107 indicates the force S indicating that the decryption state signal is not encrypted (N), and indicates that the attribute detection signal is encrypted (E).
- the output control means 108 blocks the output signal of the video decoder 105 and does not output the video signal.
- the decryptor 103 is performing decryption processing on plaintext data and cannot be decrypted normally.
- the judging means 107 indicates that the force attribute detection signal indicating that the decryption state signal is encrypted (E) is not encrypted (N).
- the output control unit 108 blocks the output signal of the video decoder 105 and does not output the video signal.
- the decryptor 103 is performing decryption processing on plaintext data and cannot be decrypted normally.
- Case d is a case that cannot normally occur.
- the judgment means 107 indicates that the decryption status signal is encrypted (E), and the attribute detection signal is also
- the decryptor 3 does not perform decryption processing on the encrypted data, and normal video is not output.
- Case e is a case that cannot normally occur.
- the judgment means 107 indicates that the decryption status signal is not encrypted (N).
- the attribute detection signal also indicates that it is not encrypted (N), so the content is illegally processed
- the judging means 107 indicates that the force attribute detection signal indicating that the decryption state signal is not encrypted (N) is encrypted (E).
- the output control means 8 blocks the output signal of the video decoder 105 and does not output the video signal.
- Case g is a case that usually cannot happen. Since the determination means 107 indicates that the force attribute detection signal indicating that the decryption state signal is encrypted (E) is not encrypted (N),
- the output control means 8 blocks the output signal of the video decoder 105 based on the determination result of the determination means 107, does not output the video signal.
- Judgment means 107 indicates that both the decryption status signal and the attribute detection signal are encoded (E and E), so the content has not been subjected to unauthorized processing.
- the output control unit 108 Based on the determination result of the determination unit 107, the output control unit 108 outputs the output signal of the video decoder 105 as it is as a video signal.
- the output control means 108 controls whether or not to output the video signal from the video decoder 105 according to the determination result of the determination means 107. Force S. Instead of this control, you can control whether to execute the playback process by drive 2 or stop it! /.
- the information reproduction apparatus (or content determination method, content determination apparatus) according to the first embodiment, or the information recording medium 101 according to the first embodiment is the information reproduction apparatus.
- a reproduction output control signal indicating whether to reproduce or stop reproduction is sent from the judging means 107 to the output control means 108.
- the output control means 108 outputs the video output signal decoded by the video decoder 105.
- the video output signal is output to the outside only when the playback output control signal permits playback.
- the controller 100 controls reproduction while detecting the state of the video decoding block 109 that is the entire video decoder including the output control means 108.
- FIG. 3 is a block diagram schematically showing the configuration of the information reproducing apparatus according to Embodiment 2 of the present invention.
- the output control means 118 is provided between the decryptor 103 and the video decoder 105, and the stream attribute monitor 116 is provided.
- 1S Point S detecting an attribute from the output of the decryptor 103, which is different from the information reproducing apparatus according to the first embodiment.
- the processing block for performing the decryption processing of the copyright protection encryption, or detecting the illegal decryption or judging the stop of reproduction is controlled. It must be firmly protected from external signal analysis and modification. Specifically, it must be designed to prevent modification when implemented in LSI or when a similar function is implemented by software. For this reason, it may be more convenient to collect and protect the parts to be protected.
- the information reproducing apparatus is different from the information reproducing apparatus according to the first embodiment in that the processing block for detecting / deterring illegal decryption and judging / controlling the reproduction stop is the circuit block 120 on the same LSI as the decryptor 103 It is summarized in the inside.
- the stream attribute monitor 116 takes the information necessary for restoring the digital watermark by monitoring the output of the decryptor 103, and the video data of the part currently being reproduced from the content of the digital watermark.
- the attribute indicating whether the data is copyright protected and encrypted should be restored and output as an attribute detection signal.
- the decryption state signal and the attribute detection signal thus extracted are input to the determination means 117, and it is determined whether or not the content being reproduced is data that has been illegally decrypted.
- FIG. 4 is an explanatory diagram showing content determination and an output video signal in the information reproducing apparatus according to the second embodiment.
- the determination by the determination means 117 is the same as that shown in FIG.
- a reproduction output control signal indicating whether to reproduce or stop reproduction is sent from the determination means 117 to the output control means 118.
- the output control means 118 receives the decoded data sent from the decryptor 103 to the video decoder 105 and outputs the video output signal to the video decoder 105 only when the playback output control signal permits playback.
- the output control means 118 of the second embodiment blocks all video signals output from the video decoder. However, the output control means 118 of the second embodiment can block only the output of the decryptor 103. Comparing Fig. 2 and Fig. 4, the output video of case b and case f is different. Fig. 4 In case b, the content is not originally encrypted, so even if the playback video is output, there is no problem from the viewpoint of copyright protection. Case f in Fig. 4 is the case where the encrypted content is not decrypted by the decryptor, and only the abnormal video is displayed, so it is considered that there is no problem from the viewpoint of copyright protection.
- the information reproducing apparatus or content determination method, content determining apparatus
- the information recording medium 101 according to the second embodiment is used as the information reproducing apparatus. If the content that was supposed to be protected by encryption is illegally decrypted and converted to plain text, when the data stream is input, it is correctly detected that the content has been decrypted. The power S prevents the processed content from being played.
- Embodiment 2 the points other than the above are the same as in Embodiment 1 above.
- the information reproduction apparatus reproduces information such as video and audio from an information recording medium on which digital content such as video and audio is recorded.
- the information recording medium is, for example, an optical disk such as a DVD or CD, or a memory card. It can also be applied to the case where the information recording medium is located at a remote location and the digital content data is electrically transmitted from there to the information reproducing apparatus.
- Digital content is an encoded representation of content such as video and audio, and has no legitimate rights to the digital content! Therefore, encryption for copyright protection is applied.
- the encryption method for example, CPRM or AACS specified for copyright protection of the contents of the optical disc can be used. It is not necessary to encrypt the entire digital content recorded on the information recording medium. Control information other than video data and audio data (for example, navigation control information) may not be copyright-protected and encrypted. .
- FIG. 5 is a block diagram showing the configuration of the information reproducing apparatus according to Embodiment 3 of the present invention.
- the information reproducing apparatus according to the third embodiment includes a system controller 7 that controls the operation of the entire apparatus, and reproducing means for reading content from the information recording medium 1.
- Drive 2 decryptor 3 that decrypts (decrypts) the encrypted stream that is the encrypted part of the content, and decryptor state that generates decryption status signal D that indicates whether decryptor 3 is in the process of decrypting With monitor 4.
- the inside of the decryptor 3 for decrypting a cipher includes an encrypted data register for retaining encrypted data to be decrypted, an encryption key register for retaining data of an encryption key for decrypting the cipher, A decryption circuit for decrypting the cipher by performing a predetermined logical operation on these data and a decryption data register for holding plaintext data as a decryption result are included.
- timing signals are issued at least when data to be decrypted is sequentially loaded into the encrypted data register and when decryption results are sequentially stored in the decryption data register. .
- a timing signal is issued for transferring intermediate data between the steps.
- the internal signal of the decryptor 3 such as the timing signal is drawn out and taken into the decryptor state monitor 4.
- the decryptor status monitor 4 determines whether or not the decryptor 3 is actually executing the decryption process, based on the internal signal, and outputs the result as a decryption status signal D.
- the decoding status signal D indicates a value (or state) Ed when the decryptor 3 is in the decoding process, and indicates a value (or state) Nd when the decryptor 3 is not in the decoding process.
- the use of the timing signal as described above is an example, and the decryption process is executed according to the encryption method or the decryption method.
- the internal signal of the decryptor 3 for determining whether or not it is selected is designed as appropriate.
- the decryptor 3 is always capable of executing decryption processing.
- the decryption circuit is encrypted data only when the data set in the encryption key register is unit original data. If the system allows the unencrypted data to pass by passing the data in the register as it is and outputting it to the decryption data register, it is pulled out from the decryptor 3 and sent to the decryptor status monitor 4.
- the internal signal to be captured is the data of the ⁇ key key register, or the data of the ⁇ key key register is the unit A configuration in which a signal indicating whether or not the data matches the original data is possible.
- the information reproducing apparatus decodes the decrypted stream of the content output from the decryptor 3 (decodes the encoded data) and outputs it as decoded data such as video and audio.
- 5 and output control means 8 that reproduces and outputs the decoded data of the content output by the decoder 5 as video and audio content, and navigation control information included in the digital content, and controls content reproduction And a playback controller 6 that performs.
- the navigation control information detected by the playback controller 6 includes a content location to be played next and setting information for playback as content. These pieces of information are processed by the system controller 7 and transmitted to the corresponding blocks as an access command to the information recording medium 1 for the drive 2, a control command for the decoding operation in the decoder 5, and a setting command for the output control means 8, respectively. And responses to them are returned.
- the content output signal output from the output control means 8 is converted into video or audio from a video display means such as a monitor (not shown) or an audio means such as a speaker and output.
- decryption performed by the decryptor 3 means a process of decrypting data encoded for copyright protection
- decryption performed by the decoder 5 It means the process of converting the encoded data of the content encoded with voice and audio to the original data.
- video data and audio data there are encrypted parts and unencrypted parts that are not encrypted, and the encrypted part is protected as it is, and the original part is encrypted. It is input to the information playback device when it is assumed that there is a case where it is illegally decrypted and encrypted on the information recording medium! /, Na! /, Recorded in plain text!
- Case Sa is a case where the content is encrypted correctly on the content power information recording medium. Since copyright protection is normal, it can be played back normally.
- Case Sb is a case where the content has been correctly encrypted on the information recording medium which should be encrypted! /, ! /. It can be considered that it is illegally decrypted and encrypted on the information recording medium and recorded as V, Na! /, In plain text. Since it can be judged that copyright protection has been broken, playback is prohibited.
- Case Sc is a case where the content is not encrypted and is encrypted on the information recording medium. It can be considered that copyright protection encryption was added by some data manipulation. Since it can be determined that copyright protection has been applied illegally, playback is prohibited.
- Case Sd is a case where content that is not originally encrypted remains correctly unencrypted even on the information recording medium. For copyright protection, there is no problem with normal playback.
- the encryption / non-encryption state on the information recording medium is the non-encryption state Nm
- the original encryption / non-encryption state is the encryption state Ec (case Sb).
- case Sc non-encrypted status
- some means are provided to enable notification, if the means (information) indicating the original encrypted / unencrypted state is further avoided by unauthorized decryption, there is a risk that the copyright of the content cannot be protected. Remains.
- the “means (or information) for notifying the encryption / non-encryption state” for example, a digital indicating the encryption / non-encryption state in the video / audio information is used.
- Information can be placed as control information. It can also be embedded in the form of “digital watermark”.
- the information reproducing apparatus of the present invention is for reproducing content that should be originally encrypted.
- the information reproducing apparatus of the present invention originally has the content encryption regulations. Only the encryption state Ec is allowed as the encryption / non-encryption state. In this way, the copyright protection is avoided by illegally deciphering the means for indicating the original encrypted / unencrypted state, and the risk of illegal reproduction can be eliminated.
- the video data and audio data of the digital content read from the drive 2 are input to the descriptor 3.
- the decryptor 3 is connected to a decryptor status monitor 4 that receives an internal signal of the decryptor 3 and generates a decryption status signal D indicating whether or not the decryptor 3 is decrypting the copyright-protected encryption.
- the decryption state signal D is decrypted by the decryptor 3 with respect to the content whose encrypted / unencrypted state is encrypted on the information recording medium.
- decryptor 3 executes the decryption process for the content whose encryption / non-encryption state on the information recording medium is the non-encryption state Nm! /, N! /, Nd for cases.
- the decoding status signal D is sent to the decoder 5.
- the decoding state signal D output from the decryptor state monitor 4 during the decoding process in the decryptor 3 indicates the value Ed (that is, the decryptor state monitor 4 outputs the decoding state signal D having the value Ed. )
- Encoding / decoding processing is properly performed on the content.
- the decryption status signal D output from the decryptor status monitor 4 during decryption processing in the decryptor 3 indicates the value Nd (that is, the decryptor status monitor 4 outputs the decryption status signal D having the value Nd).
- the decoding process of encoding is not performed. This prohibits the reproduction of illegally decrypted content.
- the decryptor 3, the decryptor status monitor 4, and the decoder 5 are LSIs used for a series of continuous digital data processing. Since these three blocks are close circuits as shown by the broken line in FIG. 5 as the content decoder 9, they are for the decoding status signal D that can be easily integrated in the LSI. It is easy to avoid unauthorized modification and monitoring for external modification.
- control information such as navigation control information other than video data and audio data in the digital content recorded on the information recording medium is decrypted. Since it is not processed and sent to the playback controller 6, copyright protection encryption is not performed.
- the information reproducing apparatus of the present invention is for reproducing content that should be encrypted, and only allows the encrypted state Ec as the original encrypted / unencrypted state. Described force A specific example of the criteria for determining the encryption / non-encryption status of content is described here.
- the video data is configured as a sequence of 24 to 30 continuous frames per second by arranging frames representing still images of a video at a certain time point in time order.
- video data encoding it is common to apply MPEG technology.
- MPEG for example, a predetermined number of consecutive frames, such as 15 frames, are grouped together and treated as a batch, and are encoded together.
- the first frame of this group is referred to as a reference frame and is encoded independently, and other frames in the same group are encoded by referring to the reference frame and other frames and using their difference values.
- the timing at which the decryptor state monitor 4 monitors the decryption state is the selection of the portion to be encrypted in the video data described above. And related to placement. While the decryption status signal D indicates the value Nd for illegally decrypted content, the decryption status signal D is erroneously detected for content that is partially (intermittently) encrypted in accordance with normal regulations. The decoding status signal Ed must be correctly indicated so that indicates the value Nd. Therefore, the decryption state is determined by monitoring whether the decryptor 3 is executing the decryption process over a period including at least one part to be encrypted in the video data. Do .
- the decryptor status monitor 4 3 is judged to be performing the decoding process, and the decoder 5 is designed so that the decoding process for encoding the content is properly performed.
- the decoder 5 observes the decoding state signal D from the decryptor state monitor 4 and determines whether the encoding decoding process for the content is performed normally or not. It is designed to make a decision after observing the decryption state signal D over a period that includes at least one part to be encrypted in the data. For example, if the decryption status signal D shows the value Ed for a moment or for a predetermined time or more during a period including at least one part to be encrypted in the video data, the decoder 3 It is judged that the decoding process is being performed, and it is designed so that the decoding process of the encoding for the content is properly performed.
- the information reproducing apparatus of the present invention is for reproducing contents that should be encrypted.
- the information reproducing apparatus of the present invention is to reproduce information recording medium power, it is inherently encrypted. If the content is encrypted and recorded! /, Playback is allowed.If content that is not originally encrypted is recorded unencrypted, playback is prohibited. Will be.
- the decoding status signal D used for controlling whether to reproduce or to prohibit reproduction Is sent directly from the decryptor state monitor 4 to the decoder 5, and the decoder 5 directly determines whether or not the decoding is performed using the data signal decoded by the decryptor 3 as content.
- Such a system configuration makes it difficult to tamper with the system, greatly reducing the risk of unauthorized decryption and unauthorized playback of content.
- FIG. 7 is a block diagram showing the configuration of the information reproducing apparatus according to Embodiment 4 of the present invention.
- the information reproducing apparatus according to the fourth embodiment of the present invention generally has a configuration similar to that of the information reproducing apparatus described in the third embodiment, and the connection destination of the decoded state signal D output from the decryptor state monitor 4 is Is different. Therefore, the difference from the third embodiment will be mainly described. Note that the blocks in Fig. 7 indicated by the same numbers as in Fig. 5 have the same functions.
- the decoding status signal D is sent to the decoder 5 in FIG. 5, whereas it is sent to the output control means 8 in FIG.
- the decrypted data of the content output by the decoder 5 is output to the content whose decryption status signal output from the decryptor status monitor 4 indicates the value Ed during the decryption processing in the decryptor 3. It is played back and output as audio content.
- the decrypted data of the content output by the decoder 5 is used as video or audio content. Prevents playback and output. This prohibits the reproduction of illegally decrypted content.
- the decryption state from the decryptor state monitor 4 When observing the signal D and determining whether or not the decrypted data of the content from the decoder 5 is reproduced and output as video or audio content, at least the portion to be encrypted in the video data is determined. It is designed so that the determination is performed after observing the decoding state signal D over a period including one or more.
- the output control means 8 determines that the decryptor 3 performs the decoding process, and performs reproduction output of the decoded data from the decoder 5.
- An advantage of implementing copyright protection in the course of processing in the output control means 8 is that the design when adding the function of the present invention to an existing LSI is easy.
- the decoder 5 When there is already a modularized IPOntellectual Property) as the decoder 5, the copyright protection function can be strengthened without redesigning the decoder 5.
- the four blocks of the decryptor 3, the decryptor state monitor 4, the decoder 5, and the output control means 8 are integrated in the LSI, and the decoding state is obtained. Avoid unauthorized modification or monitoring for external modification of signal D, etc.
- the decoding status signal D used for controlling whether to reproduce or to prohibit reproduction Is sent directly from the decryptor state monitor 4 to the output control means 8, and the output control means 8 directly determines whether or not the data signal decoded by the decoder 5 is output as the content based on the decoded state signal D.
- Such a system configuration makes it difficult to tamper with the system, greatly reducing the risk of unauthorized decryption and unauthorized playback of content.
- By configuring the system in this way when the content that should have been protected by encryption has been illegally decrypted into plain text, it is correctly confirmed that the data stream has been illegally decrypted. It is possible to prevent the content that has been detected and illegally processed from being played.
- the method of connecting the decryption state signal D described in the third embodiment to the decoder 5 to enhance the copyright protection function and the output control of the decryption state signal D described in the fourth embodiment It is also possible to realize a stronger copyright protection function by using together with the method that strengthens the copyright protection function by connecting to means 8.
- FIG. 8 is a block diagram showing the configuration of the information reproducing apparatus according to Embodiment 5 of the present invention.
- An information reproducing apparatus according to Embodiment 5 of the present invention shows a more detailed configuration of the information reproducing apparatus described in Embodiment 3. Therefore, this will be described in contrast to the third embodiment. Note that the blocks in Fig. 8 indicated by the same numbers as in Fig. 5 have the same functions.
- the information reproducing apparatus controls the drive 2 as reproducing means for reading the content from the information recording medium 1 by the system controller 7 that controls the operation of the entire apparatus to control the digital content.
- Versa 11 sorts the read digital content data by type. Video data is sent from the versa 11 to the video buffer 12, audio data is sent from the versa 11 to the audio buffer 22, and control data is also sent to the control buffer 32.
- the video data stored in the video buffer 12 is sequentially sent to a video encryption decryptor 13 that decrypts (decrypts) the encrypted stream of video content.
- the video encryption decryptor status monitor 14 receives the internal signal of the video encryption decryptor 13 and receives a video encryption decryption status signal Dv indicating whether or not the video encryption decryptor 13 is decrypting the copyright protection code. Generate.
- the video encryption decryptor 13 and the video encryption decryptor status monitor 14 correspond to the decryptor 3 and the decryptor status monitor 4 of the first embodiment, respectively.
- the video encryption / decryption status signal Dv corresponds to the decryption status signal D described in the third embodiment, and indicates a value (or status) Ed when the video encryption decryptor 13 is in the process of decryption.
- the value (or state) Nd is indicated.
- the video content decryption stream output from the video encryption decryptor 13 is decoded (decoded data) by the video decoder 15 corresponding to the decoder 5 of the first embodiment, and is output as video data.
- Decoded data of the video content output by the video decoder 15 is reproduced and output as content video by the video output control means 18 corresponding to the output control means 8 of the third embodiment.
- Content output by video output control means 18 The output signal is converted into video and output from video display means such as a monitor (not shown).
- the video encryption / decryption state signal Dv output from the video encryption / decryptor state monitor 14 during the decryption process in the video encryption / decryptor 13 indicates the value Ed (the video encryption / decryptor state monitor). 14 performs a normal encoding / decoding process on the content (the video encryption / decryption state signal DV whose value is Ed is output).
- the video encryption / decryption state signal Dv output from the video encryption / decryptor state monitor 14 during the decryption process in the video encryption / decryptor 13 shows the value Nd (the video encryption / decryptor state monitor 14 has a value of Nd video encryption / decryption status signal Dv) is not decoded. As a result, it is possible to prohibit the playback of illegally decoded video content.
- the three blocks of the video encryption decryptor 13, the video encryption decryptor status monitor 14, and the video decoder 15 are used for continuous digital data processing as shown by the video content decoder 19 in FIG. Since these circuits are close to each other, they can be easily integrated in a single chip LSI, and illegal modification and monitoring for external modification of the video encryption / decryption status signal Dv can be avoided.
- the audio data stored in the audio buffer 22 is sequentially sent to the audio encryption decryptor 23 that decrypts (decrypts) the encrypted stream of audio content.
- the voice encryption decryptor status monitor 24 receives the internal signal of the voice encryption decryptor 23 and receives a voice encryption decryption status signal Da indicating whether or not the voice encryption decryptor 23 is decrypting the copyright-protected encryption. Generate.
- the voice encryption decryptor 23 and the voice encryption decryptor status monitor 24 correspond to the decryptor 3 and the decryptor status monitor 4 of the first embodiment, respectively.
- the voice encryption / decryption state signal Da corresponds to the decryption state signal D described in the third embodiment, and indicates a value (or state) Ed when the voice encryption decryptor 23 is performing a decryption process.
- the value (or state) Nd is indicated.
- the decrypted stream of the audio content output from the audio encryption decryptor 23 is decoded (decoded encoded data) by the audio decoder 25 corresponding to the decoder 5 of the first embodiment and output as audio data.
- Decoding audio content output by audio decoder 25 The audio data is reproduced and output as audio content by the audio output control means 28 corresponding to the output control means 8 of the third embodiment.
- the content output signal output from the audio output control means 28 is converted into sound and output from sound generating means such as a speaker (not shown).
- the voice encryption / decryption state signal Da output from the voice encryption / decryptor state monitor 24 during the decryption process in the voice encryption / decryptor 23 indicates the value Ed (the voice encryption / decryptor state monitor 24).
- the encoding / decryption process is normally performed on the content (the audio encryption / decryption state signal Da having the value Ed is output).
- the voice encryption / decryption state signal Da output from the voice encryption / decryptor state monitor 24 during the decryption process in the voice encryption / decryptor 23 shows the value Nd (the voice encryption / decryptor state monitor 24 has a value of Nd's audio encryption / decryption status signal Da is output).
- the three blocks of the audio encryption decryptor 23, the audio encryption decryptor status monitor 24, and the audio decoder 25 are used for continuous digital data processing as shown by the audio content decoder 29 surrounded by a broken line in FIG. Since these circuits are close to each other, they can be easily integrated in a single-chip LSI, and unauthorized modification and monitoring for external modification of the voice encryption / decryption status signal Da can be avoided.
- the playback controller 6 receives navigation control information included in digital content via the control buffer 32, and controls playback of the content.
- the technique for strengthening the copyright protection function by connecting the decryption state signal D described in the fourth embodiment to the output control means 8 is applied to or combined with the fifth embodiment of the present invention. It is also possible to realize a stronger copyright protection function.
- the video encryption / decryption status signal Dv is connected to the video output control means 18 and / or the audio encryption / decryption status signal Da is connected to the audio encryption / decryption status signal Da. Whether to use both the video and audio decoding status signals Dv and Da or to use one of them can be determined by the load of the device design and the effect of copyright protection.
- the information playback apparatus (or content determination method) according to Embodiment 5
- the video encryption / decryption state signal Dv and the audio encryption / decryption state signal Da used for controlling whether to reproduce or to prohibit reproduction are the decryptor states of video encryption and audio encryption.
- the video and audio decoders 15 and 25 are sent directly from the monitors 16 and 24 to the video and audio decoders 15 and 25. Both decoders decode the video and audio data signals decoded by the video encryption and audio encryption decryptors 13 and 23, respectively. Whether or not to decode the speech is directly determined by the respective decoding status signals Dv and Da.
- the video encryption / decryption status signal Dv and the audio encryption / decryption status signal Da which are used to control whether playback is permitted or prohibited, are used for the video encryption and audio encryption decipherer status monitors 14 respectively.
- 24 and 24 directly to the video and audio output control means 18 and 28, both output control means 18 and 28 are connected to the video decrypted by the video encryption and audio encryption decoders 15 and 25, respectively. Whether or not the audio data signal is output as video and audio content is directly determined by the decoding status signals Dv and Da.
- FIG. 9 is a block diagram showing the configuration of the information reproducing apparatus according to Embodiment 6 of the present invention.
- the information reproducing apparatus according to the sixth embodiment of the present invention is a modification of part of the information reproducing apparatus described in the fifth embodiment, and the blocks denoted by the same numbers in FIGS. 8 and 9 are the same. Has function. Hereinafter, a description will be given in comparison with the fifth embodiment.
- FIG. 8 The difference between FIG. 8 and FIG. 9 is the connection destination of the video encryption / decryption state signal Dv and the audio encryption / decryption state signal Da.
- the video encryption / decryption state signal Dv and the audio decoding / decoding state signal Da are connected to one of the video decoder 15 and the audio decoder 25, respectively, whereas in FIG. Decoding status signal Dv and voice signal
- the encoded decoding status signal Da is connected to both the video decoder 15 and the audio decoder 25, respectively.
- only one of the video encryption / decryption status signal Dv and the audio encryption / decryption status signal Da may be used. That is, it is determined whether or not to perform the decoding process of the encoding of both the video data and the audio data based on the decoding status signal of only one of the video and the audio.
- the load of designing and manufacturing the apparatus and LSI for implementing the present invention is reduced.
- illegal modification is made by judging and prohibiting the playback of both contents by only one of the video encryption / decryption status signal Dv and the audio encryption / decryption status signal Da.
- the appropriate one for the specifications required for the system such as a configuration that is robust to design and a configuration that is easy to design and implement. it can.
- Embodiment 6 the points other than those described above are the same as those in Embodiment 3 to Embodiment 3.
- the same block configuration as the block diagram 9 showing the configuration of the information reproducing apparatus described in the sixth embodiment is used. However, there is a difference from the operation in the sixth embodiment. In other words, the video decoder 15 and the audio decoder 25 that have received the video encryption / decryption status signal Dv and the audio encryption / decryption status signal Da differ in whether to permit or prohibit the decoding of video and audio.
- the reproduction of both video and audio content is determined based on only the audio encryption / decryption status signal Da out of the video encryption / decryption status signal Dv and the audio encryption / decryption status signal Da.
- the decoding process of audio data encoding is not prohibited, and only the decoding process of video data encoding is prohibited.
- the reproduction of both video and audio content is performed using only the video encryption / decryption state signal Dv out of the video encryption / decryption state signal Dv and the audio encryption / decryption state signal Da. It is also possible to prohibit the decoding process of the encoding of the video data and not the decoding process of the encoding of the audio data for the content in which the video encryption / decryption status signal Dv indicates the value Nd. Is possible.
- the relationship between the degree of copyright protection of video and audio is the opposite of the above, and the same effect can be obtained. For example, it can be applied when the performance of a famous musician is a content recorded with a background video, and an effect can be obtained.
- either video or audio decoding state signals Dv and Da are used. Whether to protect the copyright of video or audio can be determined by the load of device design and the purpose and effect of copyright protection! /.
- the internal configuration of the decryptor 3 for decrypting the encryption has been described, but it is of course possible to apply this to the first and second embodiments.
- Embodiment 7 the method of protecting the copyright by controlling the permission / prohibition of the decoding process of either video or audio using the decoding status signals Dv and Da has been described. However, as described in the fourth embodiment, it is of course possible to use such that the copyright is protected by permitting / prohibiting the output from the output control means.
- Embodiments 1 and 2 only the copyright protection for video data has been described.
- the same method as video data can be applied to audio data, or video and audio can be Applying both methods 1 and 2 to a combination of powerful and flexible methods for copyright protection of both video and audio by mutually using both encryption / decryption status signals
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Abstract
Description
Claims
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JP2008549247A JP4393574B2 (ja) | 2006-12-11 | 2007-12-03 | 情報再生装置及び方法 |
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Also Published As
Publication number | Publication date |
---|---|
JP2012043528A (ja) | 2012-03-01 |
US20100034379A1 (en) | 2010-02-11 |
TW200838286A (en) | 2008-09-16 |
JP2009301702A (ja) | 2009-12-24 |
EP2104102A4 (en) | 2010-04-14 |
EP2104102A1 (en) | 2009-09-23 |
EP2535896B1 (en) | 2016-07-13 |
US9281004B2 (en) | 2016-03-08 |
EP2104102B1 (en) | 2013-02-20 |
JP2010238351A (ja) | 2010-10-21 |
KR20090080122A (ko) | 2009-07-23 |
JP4393574B2 (ja) | 2010-01-06 |
EP2535896A1 (en) | 2012-12-19 |
KR101011605B1 (ko) | 2011-01-27 |
TWI376937B (en) | 2012-11-11 |
JPWO2008072497A1 (ja) | 2010-03-25 |
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