JP4321279B2 - Information processing apparatus, information recording medium, information processing method, and computer program - Google Patents

Description

  The present invention relates to an information processing apparatus, an information recording medium, an information processing method, and a computer program. More specifically, the present invention relates to an apparatus and method for executing recording and reading processing of a medium unique ID unique to an information recording medium, while maintaining the difficulty of copying and preventing erroneous detection in reading an ID from a legitimate information recording medium. The present invention relates to an information processing apparatus, an information recording medium, an information processing method, and a computer program that can always acquire the same ID value.

  In recent years, devices that transmit and record digital data such as music information and video information have become widespread in the home. Since these digital recording / reproducing devices can record / reproduce data as high-quality digital data, it is possible to configure a recording / reproducing system with no quality degradation no matter how many times it is copied. While such a system is convenient, it can be misused and used as an unauthorized copy production machine, which can infringe on the rights of the content copyright holder. For this reason, such a device is required to be equipped with a copyright protection system that prevents unauthorized copying of copyright management content.

  As a copyright protection system, for example, there is a CSS (content scramble system) in a Digital Versatile Disc (DVD) ROM. CSS encrypts and stores content data subject to copyright protection on a disc, and only authorized devices can decrypt and play back encrypted content using the encryption key recorded on the disc. It is a system.

  In this CSS system, a licensed device performs content decryption and playback processing by a playback program according to a predetermined sequence that complies with operation regulations such as not performing illegal copying. However, this method is not sufficient in preventing the illegal copy of the disk. That is, if all of the data recorded on the disc is copied to a new disc, a number of illegal Coby discs are manufactured. Although the data on the disk is encrypted, if a key for decrypting the data is copied, a new disk that can be operated with a legitimate device can be created.

  In order to prevent such a problem, there is known a copyright protection technique for recording ID information (medium unique ID) as a different identifier on each information recording medium such as a disc in such a manner that it cannot be easily copied. In this method, the medium unique ID is recorded on the disk in advance. When recording a content subject to copyright management, user data, or the like, the recording data is encrypted and stored using the medium unique ID as an encryption key. As a result, even on a disc in which the same data is recorded, the data on the disc is recorded as different encrypted data one by one because the encryption key is different. Therefore, even if an illegal disk is created by copying data on the disk, the illegal disk cannot be reproduced because the encryption key generated by the medium unique ID that cannot be copied differs between the media.

  In order to enable such copyright protection by the medium unique ID, it is necessary to give the medium unique ID a predetermined strength. That is, the medium unique ID needs to be recorded with some contrivance so that it cannot be easily copied or rewritten to another medium.

  Various techniques have been developed to realize such a medium unique ID. However, each has its own drawbacks, and no method has been found that can be called decisive. For example, a DVD uses a BCA (Burst Cutting Area) writing method. BCA writing involves irradiating a disk with an ultra-high-power laser, blowing the reflective film of the disk into a barcode, and writing the barcode data to the disk. The data is written as data that is not copied in general user data copy processing. It is possible. Data written by this BCA writing is set as medium unique ID information.

  However, with this method, the recorded bar code information can be read only with the naked eye. For this reason, when a BCA-unrecorded disc is marketed and BCA writing is executed, there is a drawback that an illegal copy disc is manufactured.

  As a prior art disclosing a recording configuration of a medium unique ID that solves such a problem, for example, there is a technique described in Patent Document 1. Patent Document 1 discloses a configuration in which random pattern information based on a random physical phenomenon is recorded on a disk, and a medium unique ID is generated based on the random pattern information.

  The random pattern information is recorded as fixed information at the time of manufacture of the disk, and is recorded by, for example, winding and fixing magnetic fine fibers in the random pattern information recording area. Alternatively, it is information recorded by a method of forming random bits and recording the jitter, that is, as a frequency signal having a high-frequency fluctuation component (for example, 1 Hz or more) on the time axis of the reproduction signal.

  When reading the ID, for example, a medium unique ID is generated based on information read based on the fiber distribution. Since the distribution of the fibers is different in the random pattern for each disk, it is possible to associate different unique IDs for each disk. The configuration disclosed in Patent Document 1 applies random pattern information based on a random physical phenomenon, that is, a pattern in which the possibility of occurrence of the same pattern is almost zero, to a disc and applies it to ID generation information. This information is basically impossible to copy and cannot be discriminated with the naked eye, so it is considered to be an effective configuration for copy prevention.

  However, as described above, the random pattern recorded on the disc is read as a signal based on the fiber distribution, bit-based jitter, etc., and unlike a normal recording signal, the level of the read signal is Some are not enough. For example, in a portion having a small signal amplitude, noise based on an external signal having a small amplitude may be mixed at the time of detection, and may be identified as another value. That is, when a signal obtained from a random physical phenomenon is used as a medium unique ID, there is a possibility that the same medium may be recognized as a different medium unique ID depending on the situation when reading is performed. .

In ID reading from an information recording medium having an ID to which a recording pattern using a random physical phenomenon is applied, binarization processing based on a signal obtained from the random pattern is executed, and the obtained binarized signal is unique to the medium. Although the process of converting to ID is performed, if a subtle difference occurs in the signal obtained from the random pattern, there is a problem that a different medium unique ID is generated for each reading process.
International Publication WO00 / 46804

  The present invention has been made in view of the above-described problems, and provides an apparatus and method for executing recording and reading processing of a medium unique ID unique to an improved information recording medium, and is difficult to copy. An information processing apparatus, an information recording medium, an information processing method, and a computer program capable of always obtaining the same ID value by preventing erroneous detection in reading an ID from a legitimate information recording medium The purpose is to provide.

The first aspect of the present invention is:
An information processing device that reads data from an information recording medium,
A noise detector for reading random pattern information by detecting noise from the information recording medium;
A binarization processing unit that generates a binarized signal corresponding to the noise signal detected by the noise detection unit;
Based on the first error correction code acquired from the information recording medium, error correction processing of the binarized signal is executed, and the information obtained by the error correction is used as medium unique ID or medium unique ID generation information A first error correction unit to output;
There is an information processing apparatus characterized by having.

  Furthermore, in an embodiment of the information processing apparatus of the present invention, the information processing apparatus is configured to correspond to data including the first error correction code corresponding to the binarized signal and data including additional information. A second error correction unit that executes an error correction process of data including the first error correction code and additional information based on the second error correction code, and the first error correction unit includes: The binarized signal is subjected to error correction processing based on the first error correction code subjected to error correction processing acquired by the error correction processing of the second error correction section.

  Furthermore, in an embodiment of the information processing apparatus according to the present invention, the information processing apparatus includes a barcode detection unit that reads the first error correction code recorded on the information recording medium as barcode information. It is characterized by that.

  Furthermore, in an embodiment of the information processing apparatus of the present invention, the information processing apparatus further includes a decryption processing unit that performs decryption processing of the encrypted content stored in the information recording medium, and the decryption processing unit Is configured to execute a decryption process using an encryption key generated based on the medium unique ID.

  Furthermore, in an embodiment of the information processing apparatus of the present invention, the noise detection unit is configured to perform noise detection from a preset noise detection area in the information recording medium, and a random physical area is included in the noise detection area. The present invention is characterized in that the random pattern information recorded based on the phenomenon is read.

Furthermore, in an embodiment of the information processing apparatus of the present invention, the information processing apparatus further includes an encryption processing unit that executes encryption processing of user data stored in an information recording medium, and the encryption processing unit includes: The first error correction unit is configured to execute an encryption process using an encryption key generated based on a medium unique ID for which error correction has been performed.

Furthermore, the second aspect of the present invention provides
An information processing apparatus for performing data recording on an information recording medium,
A noise detector for reading random pattern information by detecting noise from the information recording medium;
A binarization processing unit that generates a binary signal corresponding to the noise signal detected by the noise detection unit as a medium unique ID or medium unique ID generation information;
A first error correction code calculation unit that generates a first error correction code corresponding to the binarized signal;
A second error correction code calculation unit that generates a second error correction code corresponding to data including the first error correction code corresponding to the binarized signal and additional information;
A data writing unit that executes a process of writing data including the first error correction code and additional information calculated by the first error correction code calculation unit and data including the second error correction code to the information recording medium ;
There is an information processing apparatus characterized by having.

Furthermore, in an embodiment of the information processing apparatus of the present invention, the data writing unit executes a process of writing data including the first error correction code as a barcode by a high power laser onto the information recording medium. It is characterized by being.

  Furthermore, in an embodiment of the information processing apparatus of the present invention, the noise detection unit is configured to perform noise detection from a preset noise detection area in the information recording medium, and a random physical area is included in the noise detection area. The present invention is characterized in that the random pattern information recorded based on the phenomenon is read.

Furthermore, the third aspect of the present invention provides
An information processing method for reading data from an information recording medium,
A noise detection step for reading random pattern information by noise detection from an information recording medium;
A binarization processing step for generating a binarized signal corresponding to the noise signal detected in the noise detection step;
Based on the first error correction code acquired from the information recording medium, error correction processing of the binarized signal is executed, and the information obtained by the error correction is used as medium unique ID or medium unique ID generation information A first error correction step to output;
There is an information processing method characterized by comprising:

  Furthermore, in an embodiment of the information processing method of the present invention, the information processing method is further set corresponding to data including the first error correction code corresponding to the binarized signal and additional information. A second error correction step for executing an error correction process of data including the first error correction code and additional information based on the second error correction code, wherein the first error correction step comprises: The binarized signal is subjected to error correction processing based on the first error correction code subjected to error correction processing acquired by error correction processing in the second error correction step.

  Furthermore, in one embodiment of the information processing method of the present invention, the information processing method further includes a barcode detection step of reading the first error correction code recorded on the information recording medium as barcode information. It is characterized by having.

  Furthermore, in an embodiment of the information processing method of the present invention, the information processing method further includes a decryption processing step for performing decryption processing of the encrypted content stored in the information recording medium, and the decryption processing step Is a step of executing a decryption process to which an encryption key generated based on the medium unique ID is applied.

  Furthermore, in an embodiment of the information processing method of the present invention, the noise detection step performs noise detection from a preset noise detection area in the information recording medium, and the noise detection area is based on a random physical phenomenon. The random pattern information recorded in this step is read.

Furthermore, in an embodiment of the information processing method of the present invention, the information processing method further includes an encryption processing step for executing encryption processing of user data stored in an information recording medium, and the encryption processing step includes: It is a step of executing an encryption process using an encryption key generated based on the medium unique ID for which error correction has been performed in the first error correction step.

Furthermore, the fourth aspect of the present invention provides
An information processing method for performing data recording on an information recording medium,
A noise detection step for reading random pattern information by noise detection from an information recording medium;
A binarization processing step for generating a binarized signal corresponding to the noise signal detected in the noise detection step as a medium unique ID or medium unique ID generation information;
A first error correction code calculating step for generating a first error correction code corresponding to the binarized signal;
A second error correction code calculating step for generating a second error correction code corresponding to data including the first error correction code corresponding to the binarized signal and additional information;
A data writing step of executing a process of writing data including the first error correction code and the additional information calculated in the first error correction code calculation step and data including the second error correction code to the information recording medium ;
There is an information processing method characterized by comprising:

  Furthermore, in an embodiment of the information processing method of the present invention, the data writing step executes a process of writing data including the first error correction code as a barcode by a high-power laser.

  Furthermore, in one embodiment of the information processing method of the present invention, the noise detection step is configured to perform noise detection from a preset noise detection area in the information recording medium, and a random physical The random pattern information recorded based on the phenomenon is read.

Furthermore, the fifth aspect of the present invention provides
A computer program for reading data from an information recording medium;
A noise detection step for reading random pattern information by noise detection from an information recording medium;
A binarization processing step for generating a binarized signal corresponding to the noise signal detected in the noise detection step;
Based on the first error correction code acquired from the information recording medium, error correction processing of the binarized signal is executed, and the information obtained by the error correction is used as medium unique ID or medium unique ID generation information A first error correction step to output;
There is a computer program characterized by comprising:

Furthermore, the sixth aspect of the present invention provides
A computer program for performing data recording on an information recording medium;
A noise detection step for reading random pattern information by noise detection from an information recording medium;
A binarization processing step for generating a binarized signal corresponding to the noise signal detected in the noise detection step as a medium unique ID or medium unique ID generation information;
A first error correction code calculating step for generating a first error correction code corresponding to the binarized signal;
A second error correction code calculating step for generating a second error correction code corresponding to data including the first error correction code corresponding to the binarized signal and additional information;
A data writing step of executing a process of writing data including the first error correction code and the additional information calculated in the first error correction code calculation step and data including the second error correction code to the information recording medium ;
There is a computer program characterized by comprising:

  The computer program of the present invention is, for example, a storage medium or a communication medium provided in a computer-readable format to a computer system that can execute various program codes, such as a DVD, a CD, and an MO. It is a computer program that can be provided by a recording medium or a communication medium such as a network. By providing such a program in a computer-readable format, processing corresponding to the program is realized on the computer system.

  Other objects, features, and advantages of the present invention will become apparent from a more detailed description based on embodiments of the present invention described later and the accompanying drawings. In this specification, the system is a logical set configuration of a plurality of devices, and is not limited to one in which the devices of each configuration are in the same casing.

  According to the configuration of the present invention, random pattern information recorded on the basis of a random physical phenomenon, that is, random pattern information as a noise signal in which weak level signals are mixed, medium unique ID, or medium unique ID generation information And the error correction code corresponding to the random pattern information set as the medium unique ID or the medium unique ID generation information is recorded on the information recording medium. Even if the digital noise information [NX ′] acquired as a binarized signal is different from the digital noise information [NX] corresponding to the original medium unique ID or the medium unique ID generation information, the digital noise is included. The information [NX ′] is corrected based on the error correction code [ECC1]. , It is possible to acquire the digital noise information [NX] corresponding to the correct medium unique ID.

  Furthermore, according to the configuration of the present invention, random pattern information based on a random physical phenomenon is set as the medium unique ID or the medium unique ID generation information, which is different from the conventional configuration in which the barcode is used as the medium unique ID. Thus, it is impossible to visually confirm the medium unique ID, and the manufacture of a pirated disk by rewriting the medium unique ID information visually confirmed can be prevented.

  The details of the information processing apparatus, information recording medium, information processing method, and computer program of the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram illustrating an information recording medium manufacturing process in the information processing apparatus of the present invention. Here, a manufacturing process for manufacturing the information recording medium 300 such as an optical disk will be described.

  In FIG. 1, the address information SA supplied from the address encoder 100 is supplied to the cutting machine 101. The cutting machine 101 modulates a recording laser beam and irradiates the information recording medium master 200 such as an optical disk master, thereby address information as a meandering groove (wobble) or pit row on the entire circumference of the information recording medium master 200. Record [SA]. Such address information [SA] is used for tracking or access. In step 101, the information recording medium master 200 is developed, and in step 102, plating is performed to form a stamper 201.

  Further, in step 103, the stamper 201 is attached to an injection molding machine, and an injection molding process is executed to manufacture a large number of replicated disk substrates. In step 104, a recording film setting process for each disk substrate is executed by a sputtering apparatus or the like. The recording film is composed of, for example, a magneto-optical film or a phase change film. In step 104, the protective film is further applied to ensure the environmental resistance of the recording film, and the information recording medium 202 coated with the recording film and the phase change film is manufactured.

  Further, in step S104, a noise superimposing process is performed on the noise detection area set for each disk substrate. This noise superimposing process is executed as a process for recording random pattern information based on a random physical phenomenon, as in the process described in Japanese Patent Application Publication No. WO 00/46804. Specifically, for example, fine magnetic fibers are wound and fixed on a noise detection region set in advance on the disk substrate. Alternatively, it is a process such as forming irregularities and pits such as physical random scratches. Based on the signal read from the noise detection area, a disc ID as an identifier unique to the information recording medium, that is, a medium unique ID is generated.

  In manufacturing the information recording medium in the information processing apparatus of the present invention, the processing for preventing the reading error of the medium unique ID from the noise detection area is further executed in the processing of steps 105 to 107.

  In step 105, each information recording medium 202 is reproduced with a normal pickup, and noise is detected from the noise detection area.

  FIG. 2 shows a configuration of the information recording medium 300 in which the noise detection area 303 is set. The noise detection region 303 is a region where the level of noise is set high by a method of intentionally scattering impurities as described above. The noise detected from the noise detection area 303 has a unique pattern waveform that is different for each disk. By binarizing the noise waveform, different digital noise information NX is obtained for each medium.

  Here, the noise waveform detected by the optical pickup includes, in addition to noise generated from the medium, electrical noise generated by a detector inside the pickup and shot noise generated from a laser light source. Electrical noise and shot noise vary with time. For this reason, even if the same disk is repeatedly reproduced, the noise waveform is slightly different each time. Thus, the digital noise information [NX] obtained by binarizing a different noise waveform every time may have a different value every time. However, the medium unique ID generated based on the digital noise information [NX] is used to generate a key to be applied to encryption / decryption of the content recorded on the information recording medium. Therefore, it is necessary to always detect the same medium unique ID in order to execute the encryption process / decryption process. Therefore, for copyright protection, content recording, and reproduction, it is required to always detect the same medium unique ID from the same medium.

  Therefore, in the present invention, when the information recording medium is manufactured, the digital noise information [NX] is detected from the medium, and the detected information is set as the medium unique ID. Next, in step 106 shown in FIG. 1, an error correction code A for the medium unique ID which is the digital noise information [NX] first detected from the medium is obtained. Next, in step 107, the error correction code A and other additional information 120 are recorded on the information recording medium as a barcode.

  For writing the barcode information including the error correction code A, for example, a BCA (Burst Cutting Area) writing method is applied. BCA is a process of irradiating a disk with an ultra-high-power laser, blowing the reflective film of the disk into a barcode, and writing barcode data.

  The information recording medium 300 completed after performing the processing from step 105 to step 107 is the information recording medium 300 shown in FIG. In the barcode recording area 301 shown in FIG. 2, the barcode corresponding to the additional information 120 and the error correction code A is recorded as a semi-permanent recording film change. The noise detection area 303 is arranged outside the barcode recording area 301, for example.

  The noise detection area 303 is an area where a random pattern is recorded based on a random physical phenomenon, and medium unique ID or medium unique ID generation information is acquired from noise detected from the noise detection area 303. The remaining area is a user data recording area 302. In the user data recording area 302, grooves are recorded together with address information and the like, and user data can be additionally recorded later. Note that encrypted content may be stored in advance. An encryption key generated based on the medium unique ID is applied to the encryption processing of the encrypted content.

  In the information recording medium 300 manufactured by the above-described processing, the error correction code A is recorded as a barcode (BCA) for the medium unique ID.

  In the information processing apparatus that executes the medium unique ID reading process from the information recording medium 300, first, the barcode (BCA) is read to obtain the error correction code A. Next, a noise waveform is detected from the noise detection area 303 of the information recording medium 300, the detected waveform is binarized and converted into digital noise information [NX], and the previously obtained error correction code A is applied. Corrects errors caused by electrical noise and shot noise generated during noise waveform reading.

  With this configuration, even if some electrical noise or shot noise is added and the read noise waveform contains some error information, error correction is performed by error correction processing based on the error correction code A. It is possible to generate the medium unique ID, and the same medium unique ID can always be detected from the same medium.

  With reference to FIG. 3, the configuration of error correction code generation and barcode writing processing in the information processing apparatus according to the present invention will be described in detail.

  In FIG. 3, an information recording medium 300 such as an optical disk is driven to rotate by a spindle motor 401. The spindle motor 401 is controlled to have a predetermined rotational speed by a spindle servo (not shown).

  The pickup 402 accesses a noise detection area 303 provided on the information recording medium 300. As described above, the noise detection region 303 is a region where the noise level is set high by a method of intentionally dispersing impurities. The noise detected from the noise detection area 303 has a unique pattern waveform that is different for each disk. The noise detection circuit 411 performs an appropriate filter process on the signal detected from the pickup 402 and reliably detects the noise signal. The binarization circuit 412 binarizes the noise waveform detected by the noise detection circuit 411 to obtain different digital noise information [NX] for each medium.

  Here, the digital noise information [NX] may have a different value every time due to the influence of electrical noise generated in the detector inside the pickup and shot noise generated from the laser light source. However, for normal encryption / decryption and copyright protection, it is required to always detect the same medium unique ID from the same medium. Therefore, the digital noise information [NX] read first is set as the medium unique ID or the medium unique ID generation information, and the error of the digital noise information [NX] set as the medium unique ID or the medium unique ID generation information is set. A correction code is generated and recorded on the information recording medium.

  That is, the ECC1 calculation circuit 413 adopts the digital noise information [NX] read first as the medium unique ID or the generation information thereof, and applies an appropriate error correction code [ECC1] to the digital noise information [NX]. Calculate to find. As an error correction code, for example, a Reed-Solomon code can be applied.

  The signal source 420 outputs additional information [ED]. The additional information [ED] is composed of various additional data. For example, the manufacturer of the information recording medium 300 and the ID number of the manufacturing apparatus may be set as additional information. In this embodiment, description will be made assuming that 40-bit digital information is recorded as the additional information [ED].

  The ECC2 setting unit 421 calculates an error correction code [ECC2] such as a Reed-Solomon code for the additional information [ED] and the error correction code [ECC1], adds the error correction code [ECC2], and generates barcode data. Output as [SB]. By adding the error correction code [ECC2] in this way, even if there is a defect in the information recording medium 300 and an error occurs in the read barcode, the error correction code [ECC2] Correction is made by ECC2], and correct additional information [ED] and error correction code [ECC1] can be decoded. As the error correction code [ECC2], for example, a Reed-Solomon code having a length of 32 bits can be used.

  The modulation processing unit 422 details the bar code data [SB] obtained by adding an error correction code [ECC2] such as a Reed-Solomon code to the additional information [ED] and the error correction code [ECC1]. −1 modulation processing is performed to output a modulation signal [PM] having a narrow pulse duty. At this time, the modulation processing unit 422 also adds a synchronization pattern for adjusting timing, header information for indicating the start point of data, and the like.

  The laser 423 is configured by a high output laser such as a YAG (yttrium, aluminum, garnet) laser. The laser 423 emits a laser beam [L1] by performing on / off control of the output light beam in a pulsed manner in accordance with the modulation signal [PM] input from the modulation processing unit 422. The mirror 424 bends the optical path of the laser beam [L2] and emits it toward the information recording medium 300. The objective lens 425 collects the reflected light of the mirror 424 on the reflective film of the optical disc 300. In order to form a bar code-like mark, a cylindrical lens or the like is used as the objective lens 425.

  In this way, at the place where the laser beam [L2] irradiated in a pulsed manner is focused on the recording film of the information recording medium 300, the recording film changes semipermanently, and a bar code mark is recorded. Is done. As the principle of forming such a mark, various principles can be used such as, for example, the composition of the recording film changes or the recording film evaporates and disappears. Further, in order to sufficiently widen the mark width in the track direction, a narrow bar code is formed on the information recording medium 300 by repeatedly recording the recording location while sequentially changing the recording location in the radial direction of the information recording medium 300.

  Next, an example of the barcode format will be described with reference to FIG. In this example, the bar code 301 is recorded with a width of about 800 microns around the radius 22.1 mm of the information recording medium 300. The barcode is recorded by repeating the same pattern four times per rotation, and prevents the barcode from being unreadable due to, for example, a defect on the information recording medium 300.

  A header 501 is recorded at the beginning of the bar code 301. The header 501 is composed of a pattern that does not appear in the data area, and represents the start point of the barcode. Following the header 501, barcode data [SB] 510 is recorded. The barcode data [SB] 510 includes three types of information.

  That is, 40-bit additional information [ED] 511 is recorded in the first area. Next, the error correction code [ECC1] 512 calculated for the medium unique ID is recorded as 48-bit data, for example. Finally, a 32-bit error correction code [ECC2] 513 calculated by the ECC2 setting unit 421 is recorded for the additional information [ED] 511 and the error correction code [ECC1] 512. By recording the 32-bit error correction code [ECC2] in this way, the correct additional information [ED] 511 and the error correction code are always correct even if there is an influence of a defect or the like occurring on the information recording medium 300. [ECC1] 512 can be read out.

  As described above, the barcode having such a data structure is recorded after being subjected to 4-1 modulation in the modulation processing unit 422. In 4-1 modulation, data is cut out in 2-bit units as shown in (modulation data) at the bottom of FIG. 4, and each 2 bits is recorded as a mark to which 7 positions (a to g) are applied. By setting the mark length to approximately 50 microns, it is possible to record a high-power YAG laser with an objective lens having a relatively small NA.

  Of the seven positions, the first three (ac) are synchronization patterns for timing adjustment. In the synchronization pattern, a mark is recorded at the second place among the given three positions, and the first and third positions are left as spaces. With this configuration, it is possible to obtain timing information used when decoding the data portion by detecting the mark placed at the center. In addition, by detecting a synchronous pattern repeatedly recorded at a constant period, it is possible to reliably detect data even if there is a rotational fluctuation during reproduction. The latter four (d to g) are data parts indicating data patterns corresponding to the cut out 2-bit data. As shown in the figure, in 4-1 modulation, 2-bit data is recorded using the latter four positions following the synchronization pattern.

  A 2-bit data recording configuration using four positions will be described with reference to FIG. As shown in FIG. 5, in 4-1 modulation, 2-bit data is recorded using the latter four positions following the synchronization pattern.

  In the example shown in FIG. 5, when both 2-bit data (b1, b0) are logic 0, that is, (0, 0), as shown in (a), the first among positions d, e, f, and g. A mark is recorded at position [d]. When the 2-bit data is (b1 = 0, b0 = 1), that is, (0, 1), a mark is recorded at the second position [e] as shown in (b). .

  Similarly, when the 2-bit data is (b1 = 1, b0 = 0), that is, (1,0), a mark is recorded at the third position [f] as shown in (c). In the case of (b1 = 1, b0 = 1), that is, in the case of (1, 1), a mark is recorded at the fourth position [g] as shown in (d).

  Thus, in 4-1 modulation, information is recorded by recording one mark in one of the four locations. In addition, each time 2-bit information is recorded, a synchronization pattern is inserted and recorded, so that the timing for reproduction is easy to take.

  As described above, in this case, the first error correction code [ECC1] calculated corresponding to the medium unique ID is recorded as a barcode, and the additional information [ED] and the first error correction code [ECC1] are recorded. ] Corresponding to the second error correction code [ECC2] is also recorded as a barcode. The disc on which the bar code is recorded in this manner is commercially available as a finished product information recording medium 300, and information is recorded and reproduced by the user.

  Next, referring to FIG. 6, the information recording medium manufactured by the information recording process described above, that is, the noise detection area 303 and the noise signal read from the noise detection area 303 as described with reference to FIG. The configuration and processing of the information processing apparatus that executes the reproduction process of the information recording medium 300 on which the barcode 301 including the error correction code to be recorded and the user data recording process are executed will be described.

  In FIG. 6, the information recording medium 300 records the random pattern information corresponding to the medium unique ID or the medium unique ID generation information in the noise detection area 303, and the error corresponding to the digital noise information [NX] read from the noise detection area 303. This is an information recording medium on which the correction code [ECC1] is recorded as a barcode. The information recording medium 300 is rotated by a spindle motor 601. The spindle motor 601 and the pickup 602 are controlled to perform predetermined operations by a servo circuit (not shown).

  A signal generated by the pickup 602 is converted into, for example, a reflectance change signal [HF] and a magneto-optical detection signal [MO] by a matrix amplifier (MA) 603. The reflectance change signal [HF] is suppressed by the low-pass filter (LPF) 604, so that the influence of laser noise and head amplifier noise is reduced.

  The first step is detection of the medium unique ID. For this purpose, the optical pickup 602 accesses the noise detection area 303 (see FIG. 2) provided on the information recording medium 300. The noise detection region 303 is a region where the noise level is set high by a method of intentionally dispersing impurities as described above. Random pattern information detected from the noise detection area 303, that is, noise, has a unique pattern waveform that differs from disk to disk.

  The noise detection unit 605 performs an appropriate filter process on the signal detected from the pickup 602 to reliably detect random pattern information as a noise signal. The binarization processing unit 606 binarizes the noise waveform to obtain different digital noise information [NX ′] for each medium. The digital noise information [NX ′] detected in this way is likely to have an incorrect value due to the influence of electrical noise generated in the detector inside the pickup 602 and shot noise generated from the laser light source. is there.

  Next, the pickup 602 reproduces the barcode recording area 301 (see FIG. 2) of the information recording medium 300. The BCA detection unit 607 performs 4-1 modulation decoding on the HF signal detected from the barcode recording area 301 and detects barcode data [SB].

  Here, the barcode data [SB] is composed of the additional information [ED], the first error correction code [ECC1], and the second error correction code [ECC2] as described above with reference to FIG. Has been. First, the error correction unit 608 applies the second error correction code [ECC2] included in the barcode data [SB] and performs error correction processing of the additional information [ED] and the first error correction code [ECC1]. That is, the influence of a defect or the like that occurred during signal reading is removed. Thereafter, the additional information [ED] subjected to the error correction processing is used for purposes such as copyright protection and user convenience. Further, the first error correction code [ECC1] subjected to the error correction process is sent to the error correction unit 609.

  The error correction unit 609 performs a first error correction code on the digital noise information [NX ′] generated by the binarization process of the signal read from the noise detection area 303 provided on the information recording medium 300. By applying [ECC1], an error caused by electrical noise or shot noise is corrected, and correct random pattern information, that is, medium unique ID or medium unique ID generation information is output. In this manner, the error-corrected random pattern information is digital noise information [NX] (that is, medium unique ID or medium unique ID generation information recorded in the apparatus described with reference to FIGS. 1 and 3 above. ). The encrypted content recorded on the information recording medium is decrypted based on the medium unique ID generated based on the random pattern information. This process will be described later.

  Next, a case where user data is recorded will be described. In this case, the pickup 602 moves to the user data recording area 302 (see FIG. 2) of the information recording medium 300.

  When new user data is recorded in the user data recording area 302 of the information recording medium 300, the ECC calculation unit 620 adds an error correction code to the input user data. Next, the encryption processing unit 621 encrypts the user data by applying the encryption key generated based on the previously obtained medium unique ID. Finally, after the modulation processing unit 622 performs modulation such as EFM, the pick-up 602 records a pattern signal corresponding to the write data on the information recording medium 300.

  In this way, data recorded on the information recording medium 300 is always recorded as data that has been subjected to an encryption process using an encryption key generated based on the medium unique ID. As a result, even if data is illegally copied to a pirated disk, a medium unique ID that can be generated only by a random pattern based on a random physical phenomenon cannot be copied. Therefore, from a pirated disk generated by copying encrypted data, The medium unique ID applied to the decryption of the encrypted data cannot be obtained, so that the decryption is impossible and the user data cannot be reproduced. That is, sufficient copyright protection is performed on the encrypted content recorded in the user data area.

  Next, a process for reproducing user data such as encrypted content recorded in the user data recording area 302 will be described.

  A reproduction signal including user data is supplied from the matrix amplifier 603 as, for example, a magneto-optical detection signal [MO]. The demodulation processing unit 631 performs EFM demodulation from the magneto-optical detection signal [MO] supplied from the matrix amplifier 603. The EFM demodulated data is subjected to decryption processing based on the encryption key generated by applying the medium unique ID in the decryption processing unit 632, and is supplied to the ECC error correction unit 633 as an 8-bit unit signal.

  The medium unique ID applied in the decoding processing unit 632 corrects an error caused by electrical noise or shot noise by applying the first error correction code [ECC1] to the digital noise information [NX ′]. This is the medium unique ID generated by the correct random pattern information acquired in the above.

  The ECC error correction unit 633 corrects errors included in the output signal of the decoding processing unit 632 based on ECC (Error Correcting Code) added at the time of recording. Such an error occurs due to, for example, a defect on the information recording medium 300. The output of the ECC error correction unit 633 is connected to, for example, a DA converter or the like, and after being converted into analog audio, is output as music information from a speaker or the like. Note that the data reproduction and recording processes described above are executed based on the control of the CPU 610.

  An information processing apparatus that sets a valid information recording medium 300, acquires correct random pattern information by error correction, and acquires a medium unique ID based on the correct random pattern information is obtained by using an encryption key generated based on the medium unique ID. The decryption processing unit 632 can decrypt the encrypted data, and the user can reproduce various contents such as music recorded in the information recording medium 300. On the other hand, in a disk in which correct random pattern information cannot be acquired and a valid medium unique ID cannot be acquired, for example, a pirated disk, an encryption key applied to decryption of copy content stored in the disk cannot be generated. That is, the medium unique ID generated from the noise information read from the pirated disc is different from the medium unique ID of the original disc as the copy source, and the encryption key based on the medium unique ID generated from the noise information read from the pirated disc is used. Even if is applied, decryption of the encrypted content read from the pirated disk cannot be executed. Therefore, since the utility value of the pirated disk can be lowered, the spread of the pirated disk can be prevented. In this way, if the configuration of the present invention is applied, it is possible to protect the interest of the content copyright holder.

  As described above, according to the configuration of the present invention, the random pattern information as a noise signal in which weak level signals are mixed is set as the medium unique ID or the medium unique ID generation information, and the medium unique ID or Since the error correction code corresponding to the random pattern information set as the medium unique ID generation information is recorded on the information recording medium, an error is included in the read result of the noise signal, that is, the random pattern information. Even if the acquired digital noise information [NX ′] is different from the original medium unique ID or the digital noise information [NX] corresponding to the medium unique ID generation information, the digital noise information [NX ′] is converted into the error correction code [ The digital noise information corresponding to the correct medium unique ID is corrected based on ECC1]. It is possible to acquire the [NX].

  In the embodiment described above, the manufacturer of the disc and the ID number of the manufacturing apparatus are recorded as the additional information [ED]. However, the additional information [ED] can include other arbitrary information. For example, a part of the bits of the additional information [ED] may be used as the medium unique ID. That is, the medium unique ID may be generated based on the bit information generated based on the random pattern acquired by the noise reading described above and the bit information acquired from the additional information [ED].

  The present invention has been described in detail above with reference to specific embodiments. However, it is obvious that those skilled in the art can make modifications and substitutions of the embodiments without departing from the gist of the present invention. In other words, the present invention has been disclosed in the form of exemplification, and should not be interpreted in a limited manner. In order to determine the gist of the present invention, the claims section described at the beginning should be considered.

  The series of processes described in the specification can be executed by hardware, software, or a combined configuration of both. When executing processing by software, the program recording the processing sequence is installed in a memory in a computer incorporated in dedicated hardware and executed, or the program is executed on a general-purpose computer capable of executing various processing. It can be installed and run.

  For example, the program can be recorded in advance on a hard disk or ROM (Read Only Memory) as a recording medium. Alternatively, the program is temporarily or permanently stored on a removable recording medium such as a flexible disk, a CD-ROM (Compact Disc Read Only Memory), an MO (Magneto optical) disk, a DVD (Digital Versatile Disc), a magnetic disk, or a semiconductor memory. It can be stored (recorded). Such a removable recording medium can be provided as so-called package software.

  The program is installed on the computer from the removable recording medium as described above, or is wirelessly transferred from the download site to the computer, or is wired to the computer via a network such as a LAN (Local Area Network) or the Internet. The computer can receive the program transferred in this manner and install it on a recording medium such as a built-in hard disk.

  Note that the various processes described in the specification are not only executed in time series according to the description, but may be executed in parallel or individually according to the processing capability of the apparatus that executes the processes or as necessary. Further, in this specification, the system is a logical set configuration of a plurality of devices, and the devices of each configuration are not limited to being in the same casing.

  As described above, according to the configuration of the present invention, the random pattern information recorded based on a random physical phenomenon, that is, the random pattern information as a noise signal in which weak level signals are mixed, the medium unique ID, Alternatively, it is set as the medium unique ID generation information, and the error correction code corresponding to the random pattern information set as the medium unique ID or the medium unique ID generation information is recorded on the information recording medium. An error is included in the reading result of the pattern information, and the digital noise information [NX ′] acquired as the binarized signal is different from the digital noise information [NX] corresponding to the original medium unique ID or medium unique ID generation information. Even if there is an error correction code [ECC] ] To correct based, it is possible to acquire the digital noise information [NX] corresponding to the correct medium unique ID.

  Furthermore, according to the configuration of the present invention, random pattern information based on a random physical phenomenon is set as the medium unique ID or the medium unique ID generation information, which is different from the conventional configuration in which the barcode is used as the medium unique ID. Thus, it is impossible to visually confirm the medium unique ID, and the manufacture of a pirated disk by rewriting the medium unique ID information visually confirmed can be prevented.

It is a figure explaining the manufacturing process of the information recording medium in the information processing apparatus of this invention. It is a figure explaining the storage data of the information recording medium of this invention. It is a figure explaining the data write-in process structure of the data containing the error correction code | symbol of medium specific ID corresponding to the information recording medium in the information processing apparatus of this invention. It is a figure explaining the data structure of the Harcode data containing the error correction code corresponding to medium unique ID. It is a figure explaining 1-4 modulation process data about the Harcode data containing the error correction code corresponding to medium unique ID. It is a figure explaining the structure and process of an information processing apparatus which performs the reproduction | regeneration process of an information recording medium, and a user data write process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Address encoder 101 Cutting machine 120 Additional information 200 Information recording medium master 201 Stamper 202 Information recording medium 300 Information recording medium 301 Bar code 302 User data area 303 Noise detection area 401 Spindle motor 402 Pickup 411 Noise detection section 412 Binarization processing section 413 ECC1 Calculation Unit 420 Signal Source 421 ECC2 Setting Unit 422 Modulation Processing Unit 423 Laser 424 Mirror 425 Lens 501 Header 510 Barcode Data 511 Additional Information [ED]
512 Error correction code [ECC1]
513 Error correction code [ECC2]
601 Spindle motor 602 Pickup 603 Matrix amplifier (MA)
604 Low-pass filter (LPF)
605 Noise detection unit 606 Binarization processing unit 607 BCA detection unit 608 Error correction unit 609 Error correction unit 610 CPU
620 ECC calculation unit 621 Encryption processing unit 622 Modulation processing unit 631 Demodulation processing unit 632 Decoding processing unit 633 ECC error correction unit

Claims (20)

An information processing device that reads data from an information recording medium,
A noise detector for reading random pattern information by detecting noise from the information recording medium;
A binarization processing unit that generates a binarized signal corresponding to the noise signal detected by the noise detection unit;
Based on the first error correction code acquired from the information recording medium, error correction processing of the binarized signal is executed, and the information obtained by the error correction is used as medium unique ID or medium unique ID generation information A first error correction unit to output;
An information processing apparatus comprising: The information processing apparatus includes:
Based on the second error correction code set corresponding to the data including the first error correction code corresponding to the binarized signal and the additional information, the first error correction code and the additional information, A second error correction unit that executes an error correction process of data including
The first error correction unit includes:
The binarized signal is subjected to error correction processing based on a first error correction code subjected to error correction processing acquired by error correction processing of the second error correction unit. The information processing apparatus according to claim 1. The information processing apparatus includes:
The information processing apparatus according to claim 1, further comprising: a barcode detection unit that reads the first error correction code recorded on the information recording medium as barcode information. The information processing apparatus further includes:
A decryption processing unit that performs decryption processing of the encrypted content stored in the information recording medium;
The decryption processing unit
The information processing apparatus according to claim 1, wherein the information processing apparatus is configured to execute a decryption process using an encryption key generated based on the medium unique ID. The noise detector is
The information recording medium is configured to perform noise detection from a preset noise detection area, and is configured to perform reading of random pattern information recorded in the noise detection area based on a random physical phenomenon. The information processing apparatus according to claim 1. The information processing apparatus further includes:
An encryption processing unit that executes encryption processing of user data stored in the information recording medium;
The cryptographic processing unit
2. The information processing apparatus according to claim 1, wherein the first error correction unit is configured to execute an encryption process using an encryption key generated based on a medium unique ID for which error correction has been performed. . An information processing apparatus for performing data recording on an information recording medium,
A noise detector for reading random pattern information by detecting noise from the information recording medium;
A binarization processing unit that generates a binary signal corresponding to the noise signal detected by the noise detection unit as a medium unique ID or medium unique ID generation information;
A first error correction code calculation unit that generates a first error correction code corresponding to the binarized signal;
A second error correction code calculation unit that generates a second error correction code corresponding to data including the first error correction code corresponding to the binarized signal and additional information;
A data writing unit that executes a process of writing data including the first error correction code and additional information calculated by the first error correction code calculation unit and data including the second error correction code to the information recording medium ;
An information processing apparatus comprising: The data writing unit
The information processing apparatus according to claim 7, wherein the information processing apparatus is configured to execute a process of writing data including the first error correction code as a barcode by a high-power laser in the information recording medium . The noise detector is
The information recording medium is configured to perform noise detection from a preset noise detection area, and is configured to perform reading of random pattern information recorded in the noise detection area based on a random physical phenomenon. The information processing apparatus according to claim 7. An information processing method for reading data from an information recording medium,
A noise detection step for reading random pattern information by noise detection from an information recording medium;
A binarization processing step for generating a binarized signal corresponding to the noise signal detected in the noise detection step;
Based on the first error correction code acquired from the information recording medium, error correction processing of the binarized signal is executed, and the information obtained by the error correction is used as medium unique ID or medium unique ID generation information A first error correction step to output;
An information processing method characterized by comprising: The information processing method further includes:
Based on the second error correction code set corresponding to the data including the first error correction code corresponding to the binarized signal and the additional information, the first error correction code and the additional information, A second error correction step for performing an error correction process on the data including
The first error correction step includes:
Claim 10, characterized in that on the basis of the first error correcting code has been made error correction process obtained by the error correction process in the second error correction step performs the error correction processing of the binary signal Information processing method described in 1. The information processing method further includes:
The information processing method according to claim 10 , further comprising a barcode detection step of executing reading of the first error correction code recorded on the information recording medium as barcode information. The information processing method further includes:
A decryption processing step for performing decryption processing of the encrypted content stored in the information recording medium,
The decryption step includes
The information processing method according to claim 10 , wherein the information processing method is a step of executing a decryption process using an encryption key generated based on the medium unique ID. The noise detection step includes
It is a step of executing noise detection from a preset noise detection area in an information recording medium, and reading random pattern information recorded in the noise detection area based on a random physical phenomenon. The information processing method according to claim 10 . The information processing method further includes:
An encryption processing step for executing encryption processing of user data stored in the information recording medium;
The cryptographic processing step includes
11. The information processing method according to claim 10 , wherein the information processing method is a step of executing an encryption process using an encryption key generated based on the medium unique ID for which error correction has been performed in the first error correction step. . An information processing method for performing data recording on an information recording medium,
A noise detection step for reading random pattern information by noise detection from an information recording medium;
A binarization processing step for generating a binarized signal corresponding to the noise signal detected in the noise detection step as a medium unique ID or medium unique ID generation information;
A first error correction code calculating step for generating a first error correction code corresponding to the binarized signal;
A second error correction code calculating step for generating a second error correction code corresponding to data including the first error correction code corresponding to the binarized signal and additional information;
A data writing step of executing a process of writing data including the first error correction code and the additional information calculated in the first error correction code calculation step and data including the second error correction code to the information recording medium ;
An information processing method characterized by comprising: The data writing step includes
17. The information processing method according to claim 16 , wherein a process of writing data including the first error correction code to the information recording medium as a barcode by a high-power laser is executed. The noise detection step includes
The information recording medium is configured to perform noise detection from a preset noise detection area, and reads random pattern information recorded in the noise detection area based on a random physical phenomenon. The information processing method according to claim 16 . A computer program for reading data from an information recording medium;
A noise detection step for reading random pattern information by noise detection from an information recording medium;
A binarization processing step for generating a binarized signal corresponding to the noise signal detected in the noise detection step;
Based on the first error correction code acquired from the information recording medium, error correction processing of the binarized signal is executed, and the information obtained by the error correction is used as medium unique ID or medium unique ID generation information A first error correction step to output;
A computer program characterized by comprising: A computer program for performing data recording on an information recording medium;
A noise detection step for reading random pattern information by noise detection from an information recording medium;
A binarization processing step for generating a binarized signal corresponding to the noise signal detected in the noise detection step as a medium unique ID or medium unique ID generation information;
A first error correction code calculating step for generating a first error correction code corresponding to the binarized signal;
A second error correction code calculating step for generating a second error correction code corresponding to data including the first error correction code corresponding to the binarized signal and additional information;
A data writing step of executing a process of writing data including the first error correction code and the additional information calculated in the first error correction code calculation step and data including the second error correction code to the information recording medium ;
A computer program characterized by comprising:

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