WO2004025646A1 - 情報記録装置、情報記録方法、光学式記録媒体及び情報処理装置 - Google Patents
情報記録装置、情報記録方法、光学式記録媒体及び情報処理装置 Download PDFInfo
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- WO2004025646A1 WO2004025646A1 PCT/JP2003/011652 JP0311652W WO2004025646A1 WO 2004025646 A1 WO2004025646 A1 WO 2004025646A1 JP 0311652 W JP0311652 W JP 0311652W WO 2004025646 A1 WO2004025646 A1 WO 2004025646A1
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- information
- signal
- recording medium
- optical recording
- information recording
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Classifications
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- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
- G11B23/28—Indicating or preventing prior or unauthorised use, e.g. cassettes with sealing or locking means, write-protect devices for discs
- G11B23/283—Security features, e.g. digital codes
- G11B23/284—Security features, e.g. digital codes on the record carrier
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- G—PHYSICS
- 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
- G11B20/10—Digital recording or reproducing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
- G06F12/14—Protection against unauthorised use of memory or access to memory
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- 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
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- 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
- G11B20/0021—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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- 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
- G11B20/00217—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 the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source
- G11B20/00253—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 the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is stored on the record carrier
- G11B20/00405—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 the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is stored on the record carrier the key being stored by varying characteristics of the recording track, e.g. by altering the track pitch or by modulating the wobble track
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- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
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- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
- 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
- G11B20/00485—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 characterised by a specific kind of data which is encrypted and recorded on and/or reproduced from the record carrier
- G11B20/00557—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 characterised by a specific kind of data which is encrypted and recorded on and/or reproduced from the record carrier wherein further management data is encrypted, e.g. sector headers, TOC or the lead-in or lead-out areas
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- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
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- G11B7/0053—Reproducing non-user data, e.g. wobbled address, prepits, BCA
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- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
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- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
- G11B7/00736—Auxiliary data, e.g. lead-in, lead-out, Power Calibration Area [PCA], Burst Cutting Area [BCA], control information
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- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
- G11B7/24073—Tracks
- G11B7/24082—Meandering
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/06—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols the encryption apparatus using shift registers or memories for block-wise or stream coding, e.g. DES systems or RC4; Hash functions; Pseudorandom sequence generators
- H04L9/065—Encryption by serially and continuously modifying data stream elements, e.g. stream cipher systems, RC4, SEAL or A5/3
- H04L9/0656—Pseudorandom key sequence combined element-for-element with data sequence, e.g. one-time-pad [OTP] or Vernam's cipher
- H04L9/0662—Pseudorandom key sequence combined element-for-element with data sequence, e.g. one-time-pad [OTP] or Vernam's cipher with particular pseudorandom sequence generator
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- G—PHYSICS
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- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
- G11B11/10584—Record carriers characterised by the selection of the material or by the structure or form characterised by the form, e.g. comprising mechanical protection elements
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- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
- G11B7/261—Preparing a master, e.g. exposing photoresist, electroforming
Definitions
- Information recording device information recording method, optical recording medium, and information processing device
- the present invention relates to a technique for effectively protecting the interests of copyright holders in a work in which content data is recorded on a recording medium.
- Various devices using optical recording media can easily copy music data from various contents while preventing deterioration in sound quality.
- music information distributed using network communication such as the Internet is recorded on a recordable disc for trial listening, or a borrowed compact disc (CD) is used.
- CD compact disc
- Music information can be recorded on a disc for trial listening.
- music data recorded on another disc can be copied to another disc.
- a method for recording copyright protection information for example, a method in which a sector that is difficult for a user to access is provided on a disk and the copyright protection information is recorded in this sector, A method for recording copyright protection information in the form of per code by partially removing the reflective film from the record
- a method in which a user has difficulty accessing a disk and records copyright protection information in the section has the advantage that copyright protection information can be recorded relatively easily, but the advantage is obtained. There is a problem that copyright protection information is easily copied illegally.
- the present invention has been made in consideration of the above points, and copyright protection information
- the task is to protect the interests of copyright owners effectively so that they cannot be easily detected. Disclosure of the invention
- the information recording apparatus and the information recording method according to the present invention in order to solve the above-mentioned problems, provide a signal based on a plurality of sequences obtained by disturbing digital information for copyright protection using a plurality of binary sequences. It is recorded on a recording medium.
- the optical recording medium records a signal based on a plurality of sequences obtained by disturbing digital information for copyright protection using a plurality of binary sequences.
- the information processing apparatus uses the same plurality of binary sequences as those used for disturbing the copyright protection digital information when recording the digital information, and the optical system
- the digital signal for copyright protection is restored by performing a correlation operation with the reproduced signal on the recording medium. Therefore, according to the present invention, the copyright protection digital information recorded on the optical recording medium is restored.
- Digital information can be reliably detected, and in order to restore digital information for copyright protection, a plurality of binary sequences used when recording the digital information are required. Digital information can be prevented from being illegally decoded. In other words, digital information for copyright protection is converted into a signal that changes according to a plurality of binary sequences. Because it is more recorded, it is difficult to analyze digital information for copyright protection without knowing a plurality of binary sequences used for recording.
- FIG. 1 is a diagram for explaining an outline of a manufacturing process of the optical recording medium according to the present invention.
- FIG. 2 is a diagram showing a master of the optical recording medium according to the present invention.
- FIG. 3 is a configuration diagram showing an example of an optical recording medium master exposure apparatus according to the present invention.
- FIG. 4 is a block diagram showing a configuration example of a modulation circuit in the master exposure apparatus of FIG.
- FIG. 5 is an evening timing chart for explaining the operation of the modulation circuit shown in FIG.
- FIG. 6 is an explanatory diagram schematically showing a state in which the copyright protection information is recorded as a cobble of a group on a recording medium.
- FIG. 7 is a block diagram illustrating a modulation circuit having a configuration different from that of FIG.
- FIG. 8 is an explanatory diagram showing an outline of a recording / reproducing system according to the present invention.
- FIG. 9 is a block diagram showing a configuration example of an information processing apparatus using an optical recording medium according to the present invention.
- FIG. 10 is a block diagram showing a configuration example of the second decryption circuit (copyright protection information decryption circuit) shown in FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- the present invention relates to an information recording apparatus (for example, an optical recording medium recording apparatus) and a recording method on a recording medium, and an information processing apparatus (recording / reproducing apparatus) using the recording medium.
- the present invention can be widely applied to systems such as a music disk (MD) capable of recording and reproducing, and a digital video recorder (DVR) capable of recording and reproducing video information.
- MD music disk
- DVR digital video recorder
- the present invention uses a plurality of binary sequences generated at a predetermined timing for each bit of copyright protection information related to copyright protection. While disturbing, the signals of multiple sequences generated by the disturbance are recorded on a recording medium.
- Examples of the data recording form of the optical recording medium include an information recording method using light irradiation such as a laser beam and an information recording method using electron beam irradiation (which is regarded as a promising next-generation recording method). .
- FIG. 1 is a diagram for explaining a manufacturing process of the optical recording medium according to the present invention.
- the recording form, recording medium, shape, etc. are not limited.
- a disc-shaped recording medium (hereinafter simply referred to as a “disk”) having a diameter of 64 mm is used.
- This section describes a music disc.
- This disk is created by forming a recording film, a protective film, and the like on an optical disk substrate that is copied in large quantities using a stamper.
- SA copyright protection information
- Information SA is recorded on the disc as group wobble information.
- the “copyright protection information” means information (digital information) for copyright protection related to content and the like recorded on the recording medium, and for example, as described later, an encryption (Including not only encryption processing in a narrow sense, but also scramble processing, etc.), but is not limited to this, and is used as copy control information for prohibiting or restricting illegal copying. It does not matter how it is used.
- the information recording apparatus (optical recording apparatus) 1 includes a copyright information source la, an address information source lb, and a cutting machine (master exposure apparatus) 1c.
- the copyright protection information S A output from the copyright information source 1a and the address signal output from the address information source 1b using the address format signal generation circuit are supplied to the cutting machine 1c.
- the cutting machine 1c performs signal processing on the copyright protection information SA to generate an optical modulation signal as described later, and applies a recording laser beam modulated according to the optical modulation signal to the optical disc master.
- the copyright protection information SA is recorded on the inner peripheral portion of the optical disc master disc 200 as a group record.
- the recording of the copyright protection information by the cutting machine 1c is performed in the copyright information recording area 200A at the inner periphery of the disc (see FIG. 2).
- the reason for this is that, in a normal optical disc, signal recording is performed so that information is read from the inner circumference to the outer circumference. In other words, the copyright protection information must be played back before information such as content is reproduced from the disc or before information is recorded on the disc. It is often convenient to record at the side position. Of course, there is no particular problem other than the access time even when recording is performed on the outer peripheral portion of the disc, the intermediate portion, or the like.
- copyright protection information may be recorded not only at one location on the disc but also at multiple locations on the disc in consideration of manufacturing errors and scratches caused by use of the disc (however, In this case, it is necessary to clearly define where the copyright protection information is recorded on the disc, or to use some means to obtain the location information of the copyright protection information. necessary There is. ).
- the cutting machine 1c can transmit information such as address information and a group for tracking to the user data recording area 200B.
- Record The optical disk master 200 on which the entire surface of the disk has been exposed and recorded in this manner is developed, and then becomes a stamper 201 through a plating process.
- the stamper 201 is mounted on an injection molding machine to produce a large number of replicated disk substrates 202.
- a recording film (a magneto-optical film or a phase change film) is attached to the disk substrate 202 using a sputtering device or the like.
- the disk substrate 202 on which the copyright protection information SA is recorded in the copyright information recording area on the inner periphery of the disk is coated with a protective film at the end, and the optical recording medium 2 (this example) Then it is completed as a music disc) and passed to the user. Since the data recorded on the disc is recorded after being encrypted based on the copyright protection information SA, general users can encrypt the data according to the copyright protection information recorded in the copyright information recording area on the disc. To reproduce data, or record information encrypted on the disc based on the copyright protection information on the disc (the details will be described later).
- FIG. 3 shows a main part of a configuration example of the cutting machine 1c.
- the cutting machine 1 c includes a drive source and a mechanism for rotating the optical disc master 200 and a rotation control means 3.
- the optical disc master 200 is driven to rotate by a spindle motor that is a drive source 4.
- a signal generator (FG: Frequency Generator) 5 is provided at the bottom of the spindle motor.
- the rising FG signal (detection signal) is output.
- the spindle support control unit 6 controls the drive of the spindle motor so that the frequency of the FG signal supplied from the spindle motor becomes a predetermined frequency. It is rotationally driven with a number.
- the light irradiation system 7 for the optical disk master 200 is configured using a recording light source 8 and an optical modulator 9 and optical elements such as a mirror 10 and an objective lens 11.
- a laser light source (recording laser) is used as the recording light source 8, and a laser beam L 1 is emitted to the optical modulator 9.
- a recording laser for example, a gas laser or the like is used.
- the optical modulator 9 is configured by using an electroacoustic optical element (Acousto Optical Deflector) or the like.
- the traveling direction of the laser beam L1 from the recording laser is determined. Is changed according to the optical modulation signal (this is referred to as “SD”), and is emitted as one laser beam L 2.
- SD optical modulation signal
- the mirror 100 is provided for changing the optical path of the laser beam L2, and reflects the beam light toward the optical disk master disk 200. Then, the objective lens 11 focuses the reflected light of the mirror 10 on the recording surface of the master optical disc 200. In this manner, the change in the traveling direction of the laser beam L2 condensed by the objective lens 11 replaces the displacement on the recording surface of the master optical disc 200, and the exposure is performed.
- the optical system components including the mirror 10 and the objective lens 11 are moved along the radial direction of the disc in synchronization with the rotation of the master optical disc 200 by a thread mechanism (moving mechanism) not shown. It is configured to be moved at any time.
- Tracks can be formed spirally on the master optical disc 200.
- copyright protection information SA and address information are recorded on tracks in the area.
- a groove is formed with a wobble corresponding to both of the information.
- user data recording area 200B shown in FIG. 2 a group in which address information is recorded is formed.
- the copyright protection information S A supplied from the copyright information source 1 a and the information from the address information source 1 b are processed in the signal processing unit 12.
- the copyright protection information SA is supplied to the modulation means (modulation circuit) 13.
- the address signal supplied from the address information source 1 b via the modulation means (modulation circuit) 14 (hereinafter referred to as “sz ), And modulates the copyright protection information SA as described below to generate a modulated signal (hereinafter referred to as “copyright modulated signal” and written as “SX”). Then, it is supplied to the superimposing means 15.
- the signal from the address information source 1b contains address information necessary for positioning and various format information, and the signal is supplied to a modulation means 14 having a mouth-pass filter.
- the modulating means 14 is constituted by using an address format signal generating circuit or the like, and attenuates a high frequency component signal included in the input signal, so that only low frequency components necessary as address information and format information are reduced.
- the address signal SZ is created by transmitting the signal, and the signal is supplied to the modulating means 13 and the superimposing means 15. When reproducing the signal recorded on the recording medium, it is necessary to be able to separate the modulation signal by the modulation means 13 from the modulation signal by the modulation means 14, and in this example, the frequency separation is possible.
- the modulation means 14 uses frequency modulation (including processing such as generation and insertion of a synchronization signal necessary for reproducing address information).
- the superimposing means 15 superimposes the respective modulated signals obtained by the respective modulating means 13 and 14. For example, the copyright modulation signal SX supplied from the modulation means 13 and the address signal SZ supplied from the modulation means 14 are added, and the addition result is output to the optical modulator 9 as an optical modulation signal SD.
- the superimposing means 15 includes the following components.
- -Frequency adjustment means for adjusting the frequency components of the modulated signal S X or S Z or both modulated signals
- the frequency of one modulated signal is adjusted to be equal to or higher than "f" Hertz, and the frequency of the other modulated signal is adjusted to be lower than ": f" Hertz.
- a signal at a certain frequency “a” hertz original signal
- a sine wave at frequency “b” hertz the signal components of the sum frequency (a + b) and the difference frequency (ab) are obtained, and the desired signal can be obtained by using an appropriate high-pass filter (HPF) or low-pass filter (LPF).
- HPF high-pass filter
- LPF low-pass filter
- each signal is frequency-separated at the stage before addition by the adding means, frequency multiplexing is performed by adding both signals. That is, the modulated signals S X and S Z are frequency-multiplexed and finally recorded on an optical recording medium.
- CDMA Code Division Multiple Access
- a control unit 16 configured using a CPU (central processing unit), a memory, and the like controls the entire system.
- the control unit 16 configures the modulation means 14 and the like by referring to the position on the optical disk master disk 200 where the exposure is being performed (the irradiation position of the laser beam in the disk radial direction). It supplies necessary evening information and control information to each circuit unit.
- the copyright protection information SA is used, for example, as encryption key information used when a user records data on a completed disc, and an arbitrary random number or the like can be used. Another use is to use the SA as information to identify the manufacturer of a rogue disk when it becomes available on the market. For example, data necessary for a disc may be recorded using SA as information such as a device number unique to a cutting machine, information on a manufacturing plant, and date of manufacture.
- the signal line of the copyright protection information SA from the copyright information source 1a to the modulation means 13 is shown by a single bold line in order to prevent complication.
- the protection information SA generally has a plurality of bits of information (for example, since the SA is 4-bit information in the following description, it is composed of four signal lines in the drawing). Of course, increasing the number of bits to increase the amount of information is desirable in that more information can be recorded.
- FIGS. 4 is a block diagram showing a circuit configuration example
- FIG. 5 is an operation explanatory diagram including a timing chart. .
- the address signal S Z input to the modulating means 13 is sent to a PLL (Phase Lock Loop) circuit 17 and a timing generator 18.
- PLL Phase Lock Loop
- the PLL circuit 17 generates a channel clock “CK” (see FIG. 5A) synchronized with the address signal SZ, and supplies the clock to each part of the circuit.
- the timing generator 18 detects the synchronization signal included in the address signal SZ, and counts the channel clock rcKj at a predetermined timing, thereby generating the initialization pulse “SY” (see FIG. 5B). generate.
- the initialization pulse “SY” is a pulse having a clock width (one cycle of CK) and a logical value “1” as shown in FIG. 5 (in FIG. 5, the initialization pulse SY The force that indicates only one pulse is actually generated repeatedly with a predetermined period.)
- the initialization pulse SY is used to initialize an M-sequence generation circuit (19A to 19D) described later.
- the binary sequence generating means 19 for generating a plurality of binary sequences at a predetermined timing M sequence generating circuits 19 A, 19 B, 19 C, and 19 D are used. I have.
- the “predetermined timing” means a timing based on the detection of the synchronization signal as described later.
- an M sequence Maximum Length Sequence-longest code is used as a binary sequence. Series).
- the M-sequence is a random number sequence with a specific period, but by changing the phase (initial value), random-number sequences without cross-correlation can be obtained by the same number as the sequence length. Also, pseudo-random numbers can be obtained with a relatively simple circuit configuration.
- the number of M-sequence generation circuits corresponds to the number of bits (4 in this example) related to the copyright protection information SA.
- the M-sequence generation circuits 19 A to 19 D generate different pseudo-random number sequences (M1, M2, M3 , M 4) are generated, and each series data is output individually to the digital multiplying circuits 20 A to 20 D. That is, the signal output from the M-sequence generation circuit 19 X (X indicates any one of A, B, C, and D) is a digital multiplication circuit 20 X (X is any one of A, B, C, and D). ). .
- the digital multiplying circuits 20 A to 20 D output the operation result of a plurality of bits related to copyright protection information SA (digital information) and a plurality of binary sequences by the binary sequence generating means 19.
- the computing means 20 is constituted.
- the pseudo-random number sequences M1 to M4 are M-sequences that change in units of the channel clock CK, and the M-sequence generation circuits 19A to 19D use the initialization pulse SY from the timing generator 18.
- the pseudo-random number sequence Ml is shown in Fig. 5 (E)
- M2 is shown in Fig. 5 (F).
- FIG. 5 (G) shows M3
- FIG. 5 (H) shows M4.
- the same M sequences having different initial values may be used.
- the digital multiplication circuits 20A to 20D digitally multiply the pseudo-random number sequences M1 to M4 and each bit (b0 to b3) of the copyright protection information SA. That is, the digital multiplying circuit 20A calculates an exclusive-OR of the pseudo-random number sequence Ml and the least significant bit "b0" of the copyright protection information SA, and calculates the calculation result. Selection means (Data selector 1) 21 Output to 1. Similarly, the other digital multiplying circuits 20B to 20D each have a pseudo random number sequence M2 to M4 and each bit b1 to! The same calculation is performed for 3 and 3 and output to the selection means 21.
- the exclusive OR of the pseudo-random number sequence M 2 and the bit “bl” of the copyright protection information SA is calculated by the digital multiplication circuit 20 B, and the pseudo-random number sequence M 3 and the copyright protection information SA are calculated.
- the exclusive OR of the bit “b 2” is calculated by the digital multiplying circuit 20 C, and the exclusive logical sum of the pseudo-random number sequence M 4 and the most significant bit “b 3” of the copyright protection information SA is calculated.
- the sum is calculated by the digital multiplying circuit 20D. Then, all the calculation results are sent to the selection means 21.
- the arithmetic operation performed by the arithmetic means 20 is optimally exclusive OR or its negative logical operation (logical NOT of exclusive OR).
- the reason for this is that in operations such as logical sum (OR) and logical product (AND), information is not correctly detected when information (S A) described later is restored, or detection takes a long time.
- the selection means (data selector 1) 21 constitutes the integration means 23 together with the random number generation means 22 and integrates a plurality of calculation results obtained by the calculation means 20 to obtain an integrated signal.
- the selection means 21 includes a circuit (random number generation circuit) that constitutes the random number generation means 22
- the selection means 21 selects one of the calculation results from the calculation means 20 according to the value of the random number.
- the random number generation circuit is a circuit that generates a true random number or a pseudo random number. It is preferable to generate a true random number, and since there is no periodicity in the sequence, there is an advantage that confidentiality is increased.However, from the viewpoint of simplification of the configuration, a pseudo random number generation circuit can be used instead It is.
- a circuit configuration for generating random numbers for example, a circuit for amplifying and digitizing (A / D conversion) electrical noise is cited.
- the circuit configuration for generating pseudo-random numbers for example, an M-sequence signal generation circuit or the like, or data of a random number sequence generated using a random number generation function prepared as a library function on a computer, etc. Is stored in a storage means such as a ROM (Read Only Memory) and a random number is generated by referring to data.
- the advantages of using a pseudo-random number sequence include, for example, the following.
- a stable random number sequence can be generated with a relatively simple circuit (unbiased random numbers are not generated under some conditions, and the certainty of the characteristics is guaranteed.)
- the random number generated by the random number generating means 22 changes in units of the channel clock CK, and takes one of four values “0, 1, 2, 3”.
- the selection means 21 selects one of the four inputs supplied from the digital multiplication circuits 20 A to 20 D according to the 2-bit random number supplied from the random number generation means 22. Then, the result is output to the subsequent data selector 124. For example, if the value of the random number supplied from the random number generation means 22 is “0”, the digital multiplication circuit 2 OA output is selected.
- the output selection of the digital multiplication circuit according to the random number value is performed as shown below.
- the output of the digital multiplying circuit selected by the selection means 21 is output to the data selector 24, where selection is made between another signal.
- the synchronizing pattern signal (see FIG. 5D) from the synchronizing pattern generation circuit 25 is supplied to the data selector 24.
- the synchronization pattern generation circuit 25 is provided for generating a synchronization pattern signal based on a signal from the timing generator 18. For example, as shown in Fig. 5, in synchronization with the initialization pulse "SY" (rising edge) supplied from the evening generator 18, the logic (positive logic) level of "11011" is synchronized. And outputs this signal to the data selector 124.
- the data selector 124 is supplied with a signal from the timing generator 18 (hereinafter, this signal is referred to as a “copyright synchronization pattern selection signal” and described as “ST”). As shown in FIG. 5 (C), the copyright synchronization pattern selection signal ST rises at the same time as the rise of the initialization pulse SY, and has a logic level (logic value) for a period of 5 clocks (CK) width. Is “1”.
- the data selector 24 outputs the output signal of the synchronization pattern generation circuit 25 or the output signal of the selection means 21 in accordance with the copyright synchronization pattern selection signal ST. Either one is selected. That is, while the logic level of the copyright synchronization pattern selection signal ST is “1”, the output of the synchronization pattern generation circuit 25 is selected, and the logic level of the copyright synchronization pattern selection signal ST is “1”. While it is "0”, the output of the selection means 21 is selected. Therefore, a signal portion including a synchronization pattern of “1 110 1 1” appears periodically at the output of the data selector 124, during which the signal selected by the selection means 21 randomly appears. Is included.
- FIG. 5 shows the output signal of the data selector 124 when it is assumed that the values of the 4-bit information b0 to b3 relating to the protection information SA are all 0.
- the signals shown in (A) to (H) in FIG. 5 are as follows.
- the output level of the random number generation means 22 is “0”.
- the selecting means 21 selects the sequence of M1
- the same data "0" as the sixth clock of the sequence is output from the selecting means 21.
- the output of the random number generation means 22 is “3”.
- the selecting means 21 selects the M4 sequence
- the same data "0" as the seventh clock of the sequence is output from the selecting means 21.
- a signal as shown in FIG. 5 (J) is obtained at the output of the data selector 124.
- FIGS. 5 (K) and 5 (L) show output examples of the data selector 124 when the output of the random number generation means 22 is different from that of FIG. 5 (I).
- K) shows the random number sequence generated by the random number generating means 22 and
- FIG. 5 (L) shows the output signal of the data selector 124.
- the copyright protection information S A recorded in this manner is recorded by changing the probability of group position displacement depending on the position relative to the synchronization pattern. Therefore, the copyright protection information SA can be detected by performing an operation to obtain the probability of the position displacement of the group according to the relative position from the synchronization pattern (the details will be described later). .
- the address signal SZ has a synchronization signal for signal detection embedded therein.
- This synchronization signal has no confidentiality problem, and is recorded on a recording medium as a signal having a large amplitude (signal power). This makes it easier to detect during playback. Therefore, even when a signal including copyright protection information is superimposed with a relatively small amplitude (signal power), the signal is not very noticeable, so that the synchronization signal included in the address signal is detected and the signal is output.
- the binary sequence can be initialized using the current evening and used for restoring and reproducing copyright-protected information.
- the application of the present invention is not limited to only such an address signal.
- information unique to the disc manufacturer or recommended conditions for disc reproduction for a player's automatic adjustment circuit. It is possible to use signals that include various information, such as conditions) and the possible recording (or recording) time.
- the output signal of the data selector 124 is supplied to one input terminal of an analog multiplication circuit 26, and the other input terminal of the analog multiplication circuit 26 is connected to a carrier (carrier) generation circuit 2. 7 single rounds generated by A carrier signal having a wave number is supplied.
- the analog multiplication circuit 26 multiplies the output of the data selector 124 by analog multiplication of the output of the data selector 124 by the output of the carrier generation circuit 27, thereby reducing the frequency component of the signal output by the data selector 24. Shift it high and output the result to bandpass filter (BPF) 28.
- the band-pass filter 28 passes only the output signal component of the data selector 124 shifted to a higher frequency by the analog multiplying circuit 26, thereby providing a modulated signal (copyright modulated signal) SX Generate
- the analog multiplying circuit 26, the carrier generating circuit 27, and the bandpass filter 28 constitute a modulating means 29 for creating a modulated signal in accordance with the integrated signal from the data selector 24.
- the carrier frequency by the carrier generation circuit 27 and the pass frequency band of the bandpass filter 28 are set to be different from the frequency band of the address signal SZ. This enables frequency multiplexing of the copyright modulation signal SX and the address signal SZ.
- the copyright modulation signal SX obtained as described above is used as the address signal SZ in the superposition means 15 shown in FIG. Is added to the signal and sent to the optical modulator 9.
- the optical modulator 9 constitutes a wobble modulation means 30 for meandering a track by controlling irradiation of a laser beam to the master optical disc 200 based on the modulation signal.
- the information SA is recorded on the master optical disc 200 in a form that cannot be easily decoded as a group wobble based on the copyright modulation signal SX and the address signal SZ.
- a recording form using a laser beam is employed, in addition to the optical modulator 9, a force that requires the mirror 10, the objective lens 11, and the like is required. It is not essential for the configuration of the modulating means 30.
- a wobble modulation unit is configured by an electron beam modulator. That is, in this case, An electron beam generator is used instead of the recording light source (laser light source) 8, and an electron beam modulator is used instead of the light modulator 9.
- a signal based on a plurality of sequences obtained by disturbing the digit information using a plurality of binary sequences is recorded on an optical recording medium.
- a plurality of signals generated as a calculation result using a plurality of random number sequences are finally combined into one signal.
- one sequence is randomly selected from the plurality of signal sequences. Is selected. In this case, it suffices if each selection is made exactly at random, but if the same sequence is selected for a long time, it is not preferable in terms of information confidentiality. Therefore, as described above, it is desirable to use a random sequence, and it is also desirable to ensure randomness when selecting a signal sequence.
- the signal finally obtained from the plurality of calculation results is modulated, subjected to necessary processing, and then recorded on a recording medium.
- a necessary recording means the rotation control of the disk is performed.
- Means 3, light irradiation system 7, and signal processing unit 12 are provided.
- the copyright modulation signal SX has a different waveform every time, even for exactly the same copyright protection information S A. As a result, the amount of wobble of the group recorded on the disc is different each time.
- FIG. 6 schematically shows such a coupling state. (In this figure, for the sake of conceptual clarity, data selector 1 2
- the copyright information recording area 2A of the disc-shaped optical recording medium 2 includes a microscopic wobble pattern of a group starting from a synchronization pattern. And copyright protection information SA.
- the wobble pattern of each group represents the same copyright protection information SA although it looks different for each track in the copyright information recording area 2A.
- the recorded copyright protection information SA uses a modulation signal based on an integrated signal obtained by integrating the operation results of a plurality of bit strings and a plurality of binary sequences, to generate a laser beam (or an electron beam).
- a modulation signal based on an integrated signal obtained by integrating the operation results of a plurality of bit strings and a plurality of binary sequences
- the recorded copyright protection information SA uses a modulation signal based on an integrated signal obtained by integrating the operation results of a plurality of bit strings and a plurality of binary sequences, to generate a laser beam (or an electron beam).
- group wobbled information recorded on the disk as a signal based on the data disturbed by the random number sequence. Therefore, even if the disk surface was observed using an electron microscope and a pattern equivalent to that shown in Fig. 6 was confirmed, the meandering pattern of the recorded group was randomly generated
- the amount of information recorded in the copyright information recording area 2A needs to be determined in consideration of, for example, the following conditions.
- the magnitude of the signal amplitude (The larger the amplitude, the shorter the recording interval will be. On the other hand, if the signal amplitude is too large, confidentiality may be impaired.)
- the information amount of one track may be sufficient, or it may be several thousand or tens of thousands of tracks.
- the integrating means 23 generates a random number or a pseudo-random number and generates a plurality of calculation results in accordance with the random number or the pseudo-random number. (Each output of the digital multiplying circuits 20A to 20D) is selected and output as an integrated signal.
- the integration means 23 is not limited to such a form. Absent.
- a configuration may be used in which an integrated signal is generated by providing an adding means for adding a plurality of calculation results obtained by the calculation means 20.
- an addition circuit 31 is used as an addition means instead of the selection means 21 and the random number generation means 22 (therefore, FIG. Of the parts shown, those parts which are not different from the configuration shown in FIG. 4 are denoted by the same reference numerals as those already used, and the description thereof will be omitted.)
- Each output of the digital multiplication circuits 20 A to 20 D is input to the addition circuit 31, and the addition circuit 31 sends an output obtained by adding them to the subsequent data selector 124. I do.
- either the synchronization pattern or the output of the adder circuit 31 is selected according to the copyright synchronization pattern selection signal ST, and the selection result is output to the analog multiplication circuit 2 of the modulating means 29. Sent to 6.
- the addition result by the addition circuit 31 becomes a multi-level signal
- recording and reproduction processing of the multi-level signal is necessary.
- the generated signal is often smoother than when using a binary signal, and the confidentiality of the copyright protection information hidden by superimposition with the address signal is increased. It is possible to increase.
- Examples of the device include a disk information reproducing device or recording device, and a device for recording and reproducing disk information.
- FIG. 8 is a schematic explanatory diagram of a system relating to recording and reproduction.
- the copyright protection information SA is recorded in the copyright information recording area 2A of the optical recording medium 2 using the information recording device 1 (in this example, the optical recording device).
- the same plurality of binary sequences used to disturb the information when recording the copyright protection information SA are used to correlate the signal of the sequence with the reproduced signal.
- the recording data (user data) is encrypted using the copyright protection information SA, and then subjected to modulation processing or the like suitable for recording on the optical recording medium 2.
- modulation processing or the like suitable for recording on the optical recording medium 2.
- the recording process on the recording medium is performed.
- FIG. 9 shows an example of the configuration of an optical disc recording / reproducing apparatus that performs information recording and information reproduction on an optical disc on which copyright protection information S A and address signal S Z are recorded.
- the optical recording medium 2 used in the information processing device 32 records a signal based on a plurality of sequences obtained by disturbing copyright protection information using a plurality of binary sequences. ing. Then, the disc-shaped optical recording medium 2 is rotated by a spindle motor as a driving source 33. The spindle motor is controlled by a signal from the servo circuit 34.
- the optical pick-up (or optical head) 35 is controlled to perform a predetermined operation by a servo circuit 35 (tracking servo control, focus servo control related to objective lens driving, or field-of-view position change). Thread control, etc.).
- the signal generated by the optical pickup 35 is The signal is sent to the matrix amplifier 36, where it is converted into a track error (or tracking error) signal "TK", a focus error signal "FS”, a push-pull signal "PP”, and a magneto-optical detection signal "MO”.
- the track error signal “TK” and the focus error signal “FS” are supplied to the servo circuit 34 and used for focus position control and tracking control for the objective lens of the optical pickup 35.
- the push-pull signal “PP” is a signal of the light intensity difference (so-called radial push-pull signal) by the two-segment detector, is supplied to the AZD converter (analog Z-digital converter) 37, and receives the copyright protection information SA and address. Used to detect information. Since such information is recorded on the disk as a group wobble, a wobble signal can be generated by detecting the group wobble.
- the optical pickup 35 and the matrix amplifier 36 constitute the cobble detecting means 38.
- the MO signal obtained by the matrix amplifier 36 is supplied to a decoding circuit 39, and user data recorded as a magneto-optical signal is decoded.
- the decoding circuit 39 converts the supplied MO signal into an EFM (Eight to Fourteen
- the EFM demodulated data is sent to the decryption circuit 40.
- the decryption circuit 40 together with a CPU to be described later, constitutes decryption means for decrypting the encryption processing performed on the information recorded on the optical recording medium 2 and restoring the information.
- the information decrypted based on the copyright protection information SA is supplied to the ECC circuit 41 as an 8-bit unit signal.
- the ECC circuit 41 corrects a code error included in the output signal of the decryption circuit 40 based on the ECC (Error Correction Code) added in the encoding at the time of recording. Such errors are caused by, for example, a diff on the disk.
- the input user data is sent to the encryption circuit 43 via the ECC circuit 42.
- This encryption circuit 43 constitutes an encryption means for encrypting and recording the information recorded on the optical recording medium 2 together with the CPU described later.
- the copyright protection information SA The data subjected to the encryption processing based on the data is sent to the modulation circuit 44 and modulated (EFM). Then, the data is sent to the matrix amplifier 36 to perform a recording process on the disk.
- the data digitized by the A / D converter 37 is sent to a second decryption circuit 45 where it is subjected to decryption processing.
- the copyright protection information SA obtained thereby is converted into a CPU (central processing unit) 46 Sent to
- the SA is managed only in an integrated circuit such as an LSI, and when the SA is delivered to the outside, mutual authentication is performed and concealment processing such as encryption is performed. It is necessary to give consideration before handing over.
- the CPU 46 issues an instruction to the optical pickup 35 and an objective lens.
- the copyright information recording area 2A on the inner peripheral portion of the disc is accessed while the focus servo and the tracking servo related to driving are operated.
- the copyright modulation signal S X and the address signal S Z recorded as the group wobble are observed as the push-pull signal PP.
- the A / D converter 37 converts the push-pull signal PP into an 8-bit digital push-pull signal (referred to as “DX”) according to a clock (not shown). Supplied to 5.
- the second decoding circuit 45 decodes the copyright protection information S A from the digital push-pull signal DX (details thereof will be described later), and outputs it to the CPU 46.
- the CPU 46 stores the copyright protection information SA supplied from the second decryption circuit 45. Is output to the decryption circuit 40. As described above, the decryption circuit 40 decrypts the signal supplied from the decryption circuit 39 on the basis of the copyright protection information SA supplied from the CPU 46, and generates the data in units of 8 bits. And supply it to the TECC circuit 41.
- the ECC circuit 42 adds an error correction code to the input user data.
- the encryption circuit 43 encryption is performed based on the copyright protection information SA from the CPU 46, and after the modulation circuit 44 performs modulation such as EFM, the output is output to the Madrid amplifier 3. Send to 6.
- the optical pickup 35 information is recorded as a magnetic field pattern on the disk by a magnetic head together with laser beam irradiation.
- the user data recorded on the disc in this manner is always encrypted by the copyright protection information SA specific to the disc. Therefore, user data on the disc is copied by improper means, and pirated Copyright protection information that was used as a link (encryption key) during encryption even if it was distributed as a disc could not be reproduced from a pirated disk, so it was used for user data illegally copied to a pirated disk
- the encryption process cannot be released. This can significantly reduce the value of pirated discs, which can hinder the spread of pirated discs and, as a result, protect the interests of copyright owners.
- FIG. 10 is a block diagram showing a configuration example of the second decoding circuit.
- the decryption of the copyright protection information S A is performed based on the signal from the double detection unit 38.
- the push-pull detection means 38 is a push-pull detection means for detecting a push-pull signal (PP).
- the push-pull signal PP is sent from the matrix amplifier 36 to the A / D converter 37. Is converted to a digital push-pull signal DX.
- the digital push-pull signal DX is input to the one-pass filter 1 (LPF) 47 and the band-pass filter 1 (BPF) 48.
- the single-pass filter 47 is provided to extract and output the components of the address signal SZ by passing only the low frequency components included in the digital push-pull signal DX. Further, the bandpass filter 148 extracts and outputs a component of the copyright modulation signal S X by extracting only a signal of a high frequency component included in the digital push-pull signal DX.
- the output of the single-pass filter 47 is sent to a PLL (phase-locked loop) circuit 49 and a synchronization detection circuit 50.
- the 1 ⁇ circuit 49 generates and outputs a channel clock CK similar to that used at the time of recording by reproducing the clock synchronized with the address signal SZ, and outputs the second decoding circuit 45. 11652
- the synchronization detection circuit 50 is a circuit provided for detecting the synchronization timing from the pebble signal, and constitutes the synchronization detection means 51 together with the low-pass filter 47. That is, the synchronization detection circuit 50 detects a synchronization signal component included in the address signal SZ, and outputs an initialization pulse SY at the same timing as that used during recording. That is, in this example, the synchronization detecting means 51 is an address detecting means for detecting address information.
- the initialization pulse SY is a pulse whose logic level becomes “1” during one clock, and is output at the same timing as shown in FIG. 5 (B).
- the initialization timing is the same as during recording, because the channel clock CK is reproduced by the PLL circuit 49, and the timing is measured by counting this CK by a predetermined number after detecting the synchronization signal. be able to.
- the restoration means 52 for restoring the copyright protection information S A includes a binary sequence generation means 53, a calculation means 54, and a decoding means 57.
- the M-sequence generation circuits 53A to 53D constitute a binary-sequence generation means 53 that generates a binary-sequence according to the synchronization timing based on the initialization pulse SY. That is, the M-sequence generation circuits 53A to 53D are initialized by the initialization pulse SY, and are simulated by the same M-sequence as used in the information recording device 1 (modulation means 13). The random number series M1 to M4 are generated and output to the digital multiplication circuits 54A to 54D, respectively.
- the digital multiplying circuits 54 A to 54 D are arithmetic means 54 for digitally multiplying the data of the pseudo-random number sequences M 1 to M 4 and the output data (SX) of the bandpass filter 48. Is composed. That is, when the logic level of the pseudo-random number sequence M 1 is “1”, the digital multiplying circuit 54 A inverts the polarity of the signal SX and outputs the inverted signal to the digital integrating circuit 55 A. Also, When the logic level of the pseudo-random number sequence M1 is "0", the digital multiplying circuit 54A outputs the signal SX as it is to the digital integrating circuit 55A. In other words, an exclusive OR (or its NOT) operation is performed as in the case of recording.
- the other digital multiplication circuits 54 B to 54 D also perform the same operation as the digital multiplication circuit 54 A on the pseudo-random number sequences M 2 to M 4 and the output of the band-pass filter 48, and output the result to the digital integration circuit 55.
- the digital integration circuits 55 A to 55 D constituting the decoding means 57 integrate the values obtained as the operation results in the digital multiplication circuits 54 A to 54 D one after another, thereby obtaining a synchronization pattern.
- An operation is performed to calculate the probability of the group's position displacement according to the relative position from.
- the correlation between the reproduced signal of the disc and each carrier signal is obtained. If the component of a certain carrier (binary sequence) is included as a positive polarity in the reproduced signal, the correlation degree shows a large positive value, and the binary sequence is negative (0 and 1) in the reproduced signal. If it is included as), the degree of correlation indicates a large negative value. This indicates whether 1 or 0 is recorded in each bit.
- the decoding means 52 is nothing less than a means for calculating the degree of correlation between a plurality of binary sequences and a reproduced signal, and the method for obtaining the degree of correlation is, for example, in the case of analog signal processing. It is only necessary to integrate the result while multiplying the two signals. In the case of a binary signal, as in this example, an exclusive OR or its inverted logic (negative logic) is used instead of multiplication. ) Can be used.
- the integration results in the digital integration circuits 55A to 55D are supplied to digital decision circuits 56A to 56D, respectively.
- the digital decision circuits 56A to 56D restore and output the bits b0 to b3 of the copyright protection information S A by comparing the input signal with a predetermined threshold.
- the digital multiplying circuits 54A to 54D and the digital integrators 55A to 55D are provided with a signal SX based on the reproduced signal from the disk and each carrier signal (a plurality of binary sequence signals). This circuit calculates the correlation value (or correlation coefficient) of each bit, and each correlation value takes a positive or negative value according to the logical value of each bit. Therefore, the "predetermined threshold value" in the digital decision circuits 56A to 56D is zero (or zero level) in this case.
- the decoding means 57 decodes each bit of the copyright protection information S A by integrating the wobble signal while calculating the plurality of binary sequences M 1 to M 4.
- a plurality of different binary sequences and a plurality of integrating means 55 for integrating the operation results of the pebble signal with each other are provided, and by detecting each bit related to the copyright protection information SA simultaneously and in parallel. , Bit by bit decoding is performed.
- the effect of random numbers used during recording can be removed by detection using integration, but as described above, defects caused during the manufacturing process of the disk, or scratches on the disk surface caused during handling of the disk, etc. Even when a part of the reproduced signal is lost, the copyright protection information SA can be reliably detected by repeatedly performing the integration operation.
- the synchronization pattern embedded in the address signal SZ is used to reproduce the initialization pulse SY, but the copyright synchronization signal is also embedded in the copyright modulation signal SX. Therefore, the signal can be used. That is, as another configuration example of the synchronization detecting means 51, as shown by a broken line in FIG. 10, a copyright synchronization signal included in the output of the band-pass filter 48 is detected, and in synchronization with this, What is necessary is to reproduce the initialization pulse SY. In this case, the output terminal of the band-pass filter 48 is connected to the synchronization detection circuit 50, and the synchronization pattern “1 101 1” is repeated at a predetermined cycle in the group recorded on the disk.
- the initialization pulse SY can be reproduced by detecting that the information is recorded.
- the copyright protection information SA can be reproduced, and the copyright protection information SA can be reproduced.
- an effective copy protection can be realized by preventing an illegal copy operation or the like.
- copyright protection information is not easily known unless a plurality of binary sequences used in the disturbance are known, so that the benefit of the copyright holder can be effectively utilized. Can be protected. Further, according to the present invention, the confidentiality of the information can be enhanced by recording the signal based on the copyright protection information as the wobble information relating to the optical recording medium.
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Abstract
Description
Claims
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EP03795405A EP1445772A1 (en) | 2002-09-13 | 2003-09-11 | Information recorder, information recording method, optical recording medium, and information processor |
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JP2002267968A JP3994834B2 (ja) | 2002-09-13 | 2002-09-13 | 情報記録装置、情報記録方法及び光学式記録媒体 |
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US9263085B2 (en) * | 2009-05-20 | 2016-02-16 | Sony Dadc Austria Ag | Method for copy protection |
US20120134248A1 (en) * | 2009-05-20 | 2012-05-31 | Sony Dadc Austria Ag | Method for copy protection |
JP2011023051A (ja) * | 2009-07-13 | 2011-02-03 | Sony Corp | 情報記録装置、情報再生装置、記録媒体製造装置、情報記録媒体、および方法、並びにプログラム |
US9813232B2 (en) * | 2015-03-17 | 2017-11-07 | Cypress Semiconductor Corporation | Device and method for resisting non-invasive attacks |
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JP3292298B2 (ja) * | 1999-07-14 | 2002-06-17 | ソニー株式会社 | 情報記録装置、情報記録方法、情報記録媒体、情報再生装置及び情報再生方法 |
JP2001052338A (ja) * | 1999-08-09 | 2001-02-23 | Sony Corp | 光情報記録装置、光情報記録方法、光情報記録媒体、光情報処理装置及び光情報記録媒体のアクセス方法 |
-
2002
- 2002-09-13 JP JP2002267968A patent/JP3994834B2/ja not_active Expired - Fee Related
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2003
- 2003-09-11 CN CN03801510.2A patent/CN1592932A/zh active Pending
- 2003-09-11 WO PCT/JP2003/011652 patent/WO2004025646A1/ja active Application Filing
- 2003-09-11 EP EP03795405A patent/EP1445772A1/en not_active Withdrawn
- 2003-09-11 KR KR1020047007322A patent/KR20050040857A/ko not_active Application Discontinuation
- 2003-09-11 US US10/494,036 patent/US20050174909A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11110913A (ja) * | 1997-10-01 | 1999-04-23 | Sony Corp | 音声情報伝送装置及び方法、並びに音声情報受信装置及び方法、並びに記録媒体 |
JP2001319334A (ja) * | 2000-05-11 | 2001-11-16 | Sony Corp | 光ディスク装置、光ディスクのアクセス方法及び光ディスク |
JP2002358657A (ja) * | 2001-05-31 | 2002-12-13 | Nec Corp | 光ディスク及び光ディスク装置 |
Also Published As
Publication number | Publication date |
---|---|
EP1445772A1 (en) | 2004-08-11 |
JP3994834B2 (ja) | 2007-10-24 |
KR20050040857A (ko) | 2005-05-03 |
JP2004110866A (ja) | 2004-04-08 |
CN1592932A (zh) | 2005-03-09 |
US20050174909A1 (en) | 2005-08-11 |
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