WO2006006618A1 - 情報記録媒体 - Google Patents
情報記録媒体 Download PDFInfo
- Publication number
- WO2006006618A1 WO2006006618A1 PCT/JP2005/012898 JP2005012898W WO2006006618A1 WO 2006006618 A1 WO2006006618 A1 WO 2006006618A1 JP 2005012898 W JP2005012898 W JP 2005012898W WO 2006006618 A1 WO2006006618 A1 WO 2006006618A1
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- Prior art keywords
- recording
- information
- area
- information recording
- recorded
- Prior art date
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Classifications
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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
- G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
- G11B20/1217—Formatting, e.g. arrangement of data block or words on the record carriers on discs
- G11B20/1258—Formatting, e.g. arrangement of data block or words on the record carriers on discs where blocks are arranged within multiple radial zones, e.g. Zone Bit Recording or Constant Density Recording discs, MCAV discs, MCLV discs
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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
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
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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
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
- G11B20/00094—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which result in a restriction to authorised record carriers
- G11B20/00115—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which result in a restriction to authorised record carriers wherein the record carrier stores a unique medium identifier
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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
- G11B20/00086—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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- 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
- G11B20/00086—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
- G11B20/00217—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
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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
- G11B20/00086—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
- G11B20/00217—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
- G11B20/00282—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 in the content area, e.g. program area, data area or user area
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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
- G11B20/00086—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
- G11B20/00217—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
- G11B20/00297—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 in a management area, e.g. the video manager [VMG] of a DVD
- G11B20/00304—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 in a management area, e.g. the video manager [VMG] of a DVD the key being stored in the lead-in area [LIA]
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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
- G11B20/00086—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
- G11B20/00492—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 content or user data is encrypted
- G11B20/00528—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 content or user data is encrypted wherein each title is encrypted with a separate encryption key for each title, e.g. title key for movie, song or data file
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- G—PHYSICS
- G11—INFORMATION STORAGE
- 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
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/005—Reproducing
- G11B7/0053—Reproducing non-user data, e.g. wobbled address, prepits, BCA
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- G—PHYSICS
- G11—INFORMATION STORAGE
- 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
- G11B7/007—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
- G11B7/0079—Zoned data area, e.g. having different data structures or formats for the user data within data layer, Zone Constant Linear Velocity [ZCLV], Zone Constant Angular Velocity [ZCAV], carriers with RAM and ROM areas
Definitions
- the present invention relates to the technical field of information recording media such as DVDs.
- DVD video content (hereinafter referred to as “encryption”), which is recorded in Patent Document 1 and the like, recorded in advance on a recordable information recording medium such as a DVD—RZRW and sold encrypted, and encrypted via a network.
- a distribution system that distributes “content” is disclosed.
- an information recording medium having the same physical structure as a conventional recording information recording medium such as a DVD-RZRW is used.
- the CLV (Constant Linear Velocity) control method is applied to the control area such as the control data zone in the recording type information recording medium in which wobbles for obtaining the rotational speed control signal for recording are formed.
- the CLV control method is a rotational speed control method in which the linear velocity is constant when information is recorded on the optical disk.
- the recording density along the track is constant on the inner and outer circumferences of the optical disc, so that high-density recording can be realized.
- the CAV (Constant Angular Velocity) control system is a rotational speed control system in which the angular velocity is constant, that is, the rotational speed per unit time is constant when information is recorded on the optical disk.
- the linear velocity changes during recording on the inner and outer circumferences of the optical disk. For this reason, the recording density along the track is reduced at the outer periphery.
- the use efficiency of the recording area of the optical disk is lowered, but the control of the rotation speed of the spindle motor can be simplified.
- Patent Document 1 Japanese Patent Laid-Open No. 2001-307427
- Patent Document 2 Japanese Patent Laid-Open No. 2001-357001
- Patent Document 3 Japanese Unexamined Patent Publication No. 2000-331412
- Non-Patent Document 1 “DVD Content Protection” Toshiba Review Vol.58, No6 (2003)
- a read-only type recording medium has the same physical structure as that of a conventional recording type information recording medium that has not been specially devised with respect to the recording type information recording medium. It has pre-recorded encryption key information with the same mechanism as DVD (DVD-ROM). For this reason, there is a technical problem that when a disc that has not been pre-recorded is distributed to the factory, there is a risk that the entire reproduction-only DVD may be copied to the disc.
- the present invention has been made in view of the above-described problems, for example, and improves the confidentiality and confidentiality of encryption information for encrypting content in a recordable information recording medium. It is an object to provide an information recording medium that makes it possible.
- the information recording medium of the present invention provides a first rotational speed control method (C
- CAV control method second rotational speed control method
- the first recording information recording area occupying most of the recording area such as the data area, and the relatively small area located on the inner peripheral side thereof such as the lead-in area
- the rotational speed control method for recording is different from that of the second recording information recording area. Therefore, a commercially available information recording apparatus can record the first and second recording information only on the information recording medium of the present invention only under the first rotational speed control method such as the CLV control method.
- the second recording information such as encrypted information is accurately recorded.
- pre-recording is difficult. Specifically, it is almost or completely impossible to record a recording mark of a desired length constituting the second recording information such as encrypted information at an accurate position under an appropriate rotational speed control method.
- “different rotational speed control system” or “different rotational control system” means, for example, that the zone CAV that simply changes the speed stepwise according to the radial position is excluded.
- at least a playback device such as CLV and CAV that is set to one rotation control method means a method that is different to the extent that an information recording medium recorded by the other rotation control method cannot be played back.
- the second recording information pre-recorded in the second recording information recording area is altered to unintentional information by a commercially available information recording device. Things can hardly or completely be done. For example, unintended information such as illegally encrypted information can be hardly or completely recorded in the second recording information recording area.
- the secrecy of the second recording information that is pre-recorded in the second recording information recording area or the recordable encrypted information or the like is kept high, that is, in a secure state. It becomes possible to. Therefore, it becomes almost or completely impossible to create or manufacture a recordable information recording medium on which illegal copies of the second record information such as encrypted information are made.
- the first rotation speed control method is a rotation speed control method with a constant linear velocity
- the second rotation speed control method has a constant angular velocity.
- This is a rotational speed control system.
- the second recording information recording area such as the control data zone of the information recording medium
- a wobble for obtaining a rotational speed control signal for recording is not formed.
- the second recording information such as the encrypted information is recorded at an accurate position or pre-recorded in advance by a pre-recording device that performs pre-recording under a rotational speed control method in which the angular velocity is constant. Is possible.
- a recording mark having a desired length constituting the second recording information such as encrypted information can be recorded at an accurate position or pre-recorded in advance.
- the size of the second recording information recording area such as the control data zone in the radial direction is as small as about 200 tracks on the inner periphery of the optical disc. Therefore, when recording the second recording information in the second recording information recording area, there is little or no need to change the recording parameters such as the strategy according to the difference in linear velocity.
- the second recording information recording area is a pre-recording area in which at least a part of the second recording information is recorded in advance by the second rotational speed control system. It may be configured to include
- At least a part of the second recording information such as encryption key information can only be in the second rotational speed control method in which the angular velocity is necessarily constant in the pre-recording area. It cannot be pre-recorded in advance. In other words, at least before and after the pre-recording area, it is possible to secure a margin for recording under a condition where the angular velocity is constant.
- the recordable information recording medium at least a part of the second recording information prerecorded in the second recording information recording area is altered to unintended information by a commercially available information recording device. You can hardly or completely do. In addition, for example, unintended information such as illegally encrypted information can be hardly or completely recorded in the second recording information recording area.
- the second recording information such as the encrypted information that is pre-recorded in the second recording information recording area in advance can be kept more highly confidential.
- the second recording information recording area includes at least a special area having a physical structure different from that of the first recording information recording area. You may comprise.
- a commercially available information recording device can store the first and second recorded information only under the first rotational speed control method of the CLV control method. It can be recorded. Therefore, in the special area that is at least a part of the second recording information recording area, if a wobble for obtaining a rotational speed control signal for recording is not formed, for example, the second recording information such as encrypted information It is difficult to record at the correct position. In other words, in the special area, the rotational speed control signal for recording cannot be obtained from the wobble! /, So the recording mark of the desired length that constitutes the second recording information such as the encrypted information is replaced with the CLV control method. Under appropriate rotational speed control schemes, etc., it is hardly or completely impossible to record at an accurate position.
- the secrecy of the second recording information such as encrypted information pre-recorded or recordable in a special area that is at least a part of the second recording information recording area is made higher. It becomes possible to hold.
- a recording track for recording the first recording information is formed in a meandering manner in the first recording information recording area.
- the recording track on which at least a part of the second recording information is recorded is formed in a meandering manner! /.
- the pre-recording area or the second recording information recording area includes a special area in which no wobble is formed, unlike the first recording information recording area. Therefore, in this special area, since a recording clock and recording address based on a wobble force signal, that is, a rotational speed control signal for recording, is not acquired by a commercially available information recording device, illegal encryption is performed. Tampering with unintended information, such as information, and overwriting unintentional information can hardly or completely be prevented.
- a wobble is formed by a meandering recording track for recording the first recording information, and the special area
- a wobble having at least one of frequency, amplitude, and phase different from the wobble is formed by meandering recording tracks for recording at least a part of the second recording information. It may be configured as follows.
- the pre-recording area or the second recording information recording area differs from the wobble formed in the first recording information recording area in at least one of frequency, amplitude, and phase.
- the special region may be configured by random modulation obtained by modulating a plurality of parameters among the frequency, amplitude, and phase of the wobble.
- land tracks and groove tracks are alternately formed as the recording tracks, and a predetermined type of pre-information is provided on the land tracks.
- the land prepits to be carried may be formed in advance, and the land prepits may not be formed in the special area.
- the land track and the group track are further connected to the special area. It may be configured so that a hook is formed.
- second information such as encrypted information pre-recorded or recordable in the second recording information recording area is suppressed while suppressing the complexity of the manufacturing process of the information recording medium.
- the confidentiality of the recorded information can be kept higher.
- land tracks and groove tracks are alternately formed as the recording tracks in the first recording information recording area.
- the land track and the groove track are also formed and can be configured as described above. /.
- a control information recording area (for example, a control data zone) in which control information related to reproduction and recording control can be recorded is further provided. At least one of start address information indicating the start position of the second recording information recording area and end address information indicating the end position of the second recording information recording area may be recorded. Yo ...
- the physical structure in the second recording information recording area is identified by the pre-recording device, so that a valid recording type information recording medium and an illegal recording type information recording medium can be accurately and quickly obtained. It becomes possible to distinguish.
- preformat address information is recorded in at least one of the first recording information recording area and the second recording information recording area
- At least one of start address information indicating the start position of the second recording information recording area and end address information indicating the end position of the second recording information recording area is added to the preformat address information. It may be configured as ⁇ With this configuration, for example, the second information added to the preformat address information in at least one of the first record information recording area and the second record information recording area by a prerecording apparatus that performs prerecording.
- At least one of start address information indicating the start position of the recording information recording area and end address information indicating the end position of the second recording information recording area can be acquired.
- preformat address information means, for example, the same method as preformat address information, such as prepit address information, or before and after the arrangement of preformat address information. This means that it is recorded as pre-information that is arranged or inserted in the middle of the array of pre-format address information. Therefore, the pre-recording device can quickly identify the position of the second recording information recording area.
- the physical structure in the second recording information recording area is identified by the pre-recording device, so that a legitimate recording type information recording medium and an illegal recording type information recording medium can be accurately and quickly obtained. It becomes possible to distinguish.
- the second recording information is encryption information for encrypting the first recording information.
- the second recording information (for example, a disc key) includes other encrypted information (for example, a title key) for encrypting the first recording information.
- the other encrypted information is recorded in the first record information recording area together with the first record information.
- the correlation of encryption information such as an encryption key can be made into a hierarchical structure. Accordingly, the copyright owner, the disc manufacturer, etc. can freely set the encryption information, and it is possible to construct a more convenient encryption system.
- the information recording medium of the present invention since the first recording information recording area and the second recording information recording area are provided, pre-recording is performed in advance in the second recording information recording area.
- the second recorded information such as encrypted information that can be recorded or recorded can be kept highly confidential, that is, can be in a secure state.
- FIG. 1 shows a basic structure of an optical disc according to an embodiment of an information recording medium of the present invention, and the upper part is a schematic plan view of an optical disc having a plurality of recording areas, and is associated with this lower plan view.
- the side portion is a schematic conceptual diagram of the recording area structure in the radial direction.
- FIG. 2 is a partially enlarged perspective view of the recording surface of the optical disc in the example.
- FIG. 3 is a schematic conceptual diagram showing a recording clock and a recording address necessary for recording which can obtain a groove track wobbling force in an optical disc according to an embodiment of the information recording medium of the present invention.
- FIG. 4 is a schematic conceptual diagram showing one specific example of the physical structure of the recording area of the optical disc in the embodiment of the information recording medium of the present invention.
- FIG. 5 is a schematic conceptual diagram showing various characteristics when a CAV control method is applied to a general optical disc.
- FIG. 6 is a schematic conceptual diagram showing various characteristics when a CLV control method is applied to a general optical disc.
- FIG. 7 is a schematic conceptual diagram showing a wobble signal obtained as a special region force that is at least a part of a control data zone in another specific example of an optical disc according to an embodiment of the information recording medium of the present invention.
- FIG. 8 is a block diagram showing the overall configuration of an information recording / reproducing apparatus for pre-recording cipher key information on an information recording medium of the present invention and reproducing recorded information such as contents.
- FIG. 9 is a flowchart showing a pre-recording operation in the pre-recording apparatus according to the example.
- FIG. 10 is a block diagram showing the overall configuration of an information recording / reproducing apparatus that performs a recording operation on an information recording medium of the present invention and a distribution system that includes an information distributing apparatus that performs a distribution operation.
- FIG. 11 is a flowchart showing distribution processing in the information recording medium, information recording / reproducing apparatus, and information distribution apparatus of the present invention.
- FIG. 12 is a flowchart showing the flow of a reproducing operation according to a specific example of the embodiment of the information recording / reproducing apparatus of the present invention.
- SS spread spectrum data CK1 ... 1st clock signal, GT ... Grove track, LT ... Land track, LB ... Laser light, LPP ... Land pre-pit, Keyl --- Encryption key information (disc key and disc key set), Key2 ... Encryption key information (title key;), CDZ ... control data zone, CDZa ... special area, NBCA 'Narrow Burst Cutting Area
- Embodiments of the information recording medium of the present invention will be described below with reference to FIGS.
- FIG. 1 shows the basic structure of an optical disc according to an embodiment of the information recording medium of the present invention.
- the upper part is a schematic plan view of an optical disc having a plurality of recording areas, and the lower side associated with this is shown in FIG.
- FIG. 3 is a schematic conceptual diagram of a recording area structure.
- FIG. 2 is a partially enlarged perspective view of the recording surface of the optical disc of this example.
- the information recording medium according to this example is a write-once optical disc using an organic dye film.
- the information recording medium according to the present embodiment can be rewritten by a reversible change recording method using various heating and the like, and can be reproduced many times. Even a type optical disc.
- the optical disc 100 for example, is applied to the recording surface on the disc main body having a diameter of about 12 cm like the DVD, with the center hole 1 as the center and the inner peripheral side force toward the outer peripheral side.
- a buffer area according to the example, a lead-in area 101, a data area 102, and a lead-out area 103 are provided as other buffer areas.
- a control data zone CDZ is provided in the lead-in area 101.
- a disc key such as a disc key or disc key set is encrypted based on a predetermined encryption system.
- Information Keyl is pre-recorded.
- a specific example of “second recording information” according to the present invention is constituted by the encryption key information Keyl such as a disk key or a disk key set.
- the lead-in area 101 is provided with an NBCA (Narrow Burst Cutting Area).
- NBCA Near Burst Cutting Area
- media ID a serial number unique to each optical disc 100, so-called media ID, is recorded in a bar code form by laser cutting.
- a specific example of the “second recording information recording area” according to the present invention is constituted by the control data zone CDZ.
- the control data zone CDZ may be configured to include a special area CDZa described later.
- encryption key information Key2 such as a title key based on the encryption key system and encryption key content encrypted by the encryption key information Key2 such as the title key are stored. To be recorded. More specifically, the encryption key information Key2 such as a title key is encrypted with the above-described disk key or encryption key information Keyl such as a disk key set.
- a specific example of “other encryption key information” according to the present invention is constituted by the encryption key information Key 2 such as the title key.
- the “first recording information recording area” One specific example is constituted by the data area 102.
- tracks 10 such as a groove track and a land track are alternately provided in a spiral shape or a concentric shape around the center hole 1.
- the optical disc 100 is formed by laminating a dye-type recording layer 107 constituting an information recording surface on the lower side of a disc-shaped transparent substrate 106 and further on the lower side.
- the reflective layer 108 is laminated.
- Groove tracks GT and land tracks LT are alternately formed on the information recording surface which also has the surface force of the recording layer 107.
- the laser beam LB is irradiated onto the groove track GT via the transparent substrate 106.
- recording is performed on the recording layer 107 according to the recording data by irradiating the laser beam LB with a recording laser beam.
- the recording data recorded on the recording layer 107 is read by irradiating the laser beam LB with a reproduction laser power weaker than the recording laser power.
- groove track GT land track LT
- wobble 109 land pre-pit LP P, and the like will be described in detail later.
- data is recorded on the track 10 in units of 1 ECC block (cluster), which is a management unit of 16 unit forces, for example, 16 sectors.
- This 1ECC block is a management unit based on preformatted address information that can be error-corrected.
- the present invention is not particularly limited to the optical disc 100 having four recording areas as shown in FIG.
- the presence of the lead-in area 101 and the lead-out area 103 is arbitrary, and there is a data area 102 in which recording data is recorded and a recording area of a PCA (Power Calibration Area) for detecting the optimum recording power (not shown). At least it should be provided.
- PCA Power Calibration Area
- FIG. 3 shows the wobbling force of the groove track in the optical disc according to the embodiment of the information recording medium of the present invention.
- FIG. 3 is a schematic conceptual diagram showing a recording clock and a recording address necessary for recording.
- the groove track GT is oscillated with a constant amplitude and a spatial frequency. That is, the group track GT is wobbling, and the period of the wobble 109 is set to a predetermined value.
- the preformat address information may be recorded in advance by modulating the wobble 109 of the groove track GT by a predetermined modulation method such as frequency modulation or phase modulation.
- the recording address on the optical disk is called an ATIP (Absolute Time In Pre-groove) signal due to a subtle change in frequency. Incorporated as absolute time information.
- address pits called land prepits LPP indicating preformat address information are formed on the land track LT.
- the two types of addressing described above ie, wobble 109 and ATIP or land prepit LPP, obtain the information necessary for recording data such as the rotational speed control of the optical disc being recorded, the generation of the recording clock, and the recording address. be able to. More specifically, for example, in order for a recording drive such as a disk drive to write in a data area constituting an example of the “first recording information recording area” according to the present invention, for example, an optimal recording of laser light. In addition to recording parameters such as power and recording strategy, the recording clock and recording address used for writing are required.
- FIG. 4 is a schematic conceptual view showing one specific example of the physical structure of the recording area of the optical disc in the embodiment of the information recording medium of the present invention.
- FIG. 5 is a schematic conceptual diagram showing various characteristics when a CAV control method is applied to a general optical disc.
- Figure 6 shows a typical optical device.
- FIG. 7 shows a special area force that is at least part of the control data zone in another embodiment of the optical disc according to the embodiment of the information recording medium of the present invention. It is the schematic conceptual diagram which showed the bull signal.
- the optical disc 100 As shown in FIG. 4, in the optical disc 100 according to the present embodiment, at least a part of the control data zone CDZ in which the encryption information Keyl such as a disc key is pre-recorded is provided as the special area CDZa. ing. In this special area CDZa, a wobble 109 is formed!
- a rotational speed control system that makes the angular speed constant, such as the CAV control system, is applied, so that a rotational speed control signal for recording is obtained.
- the cipher key information Keyl can be pre-recorded in advance at an accurate position only by a pre-recording apparatus that performs pre-recording. Specifically, it is possible to pre-record a recording mark of a desired length constituting the encryption key information Keyl at an accurate position in advance.
- the CAV control system has a constant angular velocity when recording information on an optical disk, that is, per unit time.
- This is a rotational speed control method with a constant rotational speed. Therefore, in the CAV control method, the linear velocity changes during recording on the inner and outer circumferences of the optical disc. For this reason, it becomes possible to simplify the control of the rotation speed of the spindle motor.
- the size of the control data zone CDZ in the radial direction is as small as about 200 tracks on the inner circumference of the optical disk. Therefore, when recording the encryption key information Key in the control data zone CDZ to which the CAV control method is applied, it is almost or completely necessary to change the recording parameters such as the recording strategy according to the change of the linear velocity. Nah ...
- the lead-in area 101, the data area 102, and the lead other than the control data zone CDZ of the optical disc 100 according to the present embodiment.
- the CLV control method is applied.
- the number of revolutions per unit time can be increased on the inner circumference side of the optical disc 100, and the number of revolutions per unit time can be lowered on the outer circumference side. Therefore, when recording information in these three recording areas, the rotational speed of the spindle motor is controlled in accordance with the radial position of the optical disk based on the rotational speed control signal for recording obtained by the wobble force.
- the linear velocity can be made constant.
- a commercially available information recording device such as a disk drive records at least the encryption key information Keyl such as a disk key recorded in this special area CDZa as illegal encryption key information or the like. Overwriting of unintentional information is hardly or completely impossible.
- the general information recording device can hardly or completely tamper with information such as illegally encrypted information. More specifically, a general information recording apparatus can record information only under the CLV control method, so the rotation speed is slower than the CAV control method! Because information is recorded in the control data zone CDZ to which the control method is applied, positional deviation occurs.
- wobble 109 and ATIP or land prepit LPP cannot be detected, so a general information recording device cannot generate a recording clock, so it controls the rotation of the disc being recorded. It is because it cannot be done. This is because a general information recording apparatus cannot acquire information necessary for recording data such as a recording address.
- an information recording / reproducing apparatus such as a general DVD player
- a proper recording is performed depending on whether or not wobble is detected in the special area CDZa which is at least a part of the control data zone CDZ.
- Type optical discs and illegal recording type optical discs can be distinguished accurately and quickly. More specifically, the type of the optical disc is determined by a seek operation or the like for acquiring control information related to reproduction or recording by the information recording / reproducing apparatus 200a described later. In this case, it is detected whether or not a wobble 109 peculiar to the recordable optical disk exists in a special area which is at least a part of the control data zone CDZ.
- the wobble 109 it is possible to accurately distinguish between a legitimate recordable optical disc and an illegal recordable optical disc. That is, if the wobble 109 is not detected in the special area CDZa, it can be determined that the disc is a valid recordable optical disc. On the other hand, in the special area CDZa If wobble 109 is detected, it can be determined that the optical disc is illegal.
- the wobble 109 is not formed in the special area CDZa, which is at least part of the control data zone CDZ, the existing rules regarding playback or recording of encrypted content are partially observed. It is also possible to do. More specifically, an optical disc on which a wobble is formed, that is, a recordable optical disc, is not recommended to record encryption key information such as a disc key, in other words, a wobble is formed. It is possible to partially comply with the rule that it is recommended to record encryption information only on optical discs that are not, that is, read-only optical discs. In the general information recording / reproducing apparatus 200a described later, the optical disc may be configured to be ejected without observing existing rules.
- the special area CDZa which is at least a part of the control data zone CDZ, as shown in Fig. 7 (a).
- the special area CDZa may be configured so that the wobble signal WB1 is obtained. More specifically, the amplitude of the wobble is decreased and AM (Amplitude Modulation) is performed in front of the special area CDZa with reference to the direction of the recording track.
- AM Amplitude Modulation
- the amplitude of the wobble is increased to AM.
- the special area CDZa which is at least a part of the control data zone CDZ, as shown in FIG.
- the special area CDZa may be configured so that the wobble signal WB2 is obtained. More specifically, in all the areas of the special area CDZa, the wobble may be almost or completely eliminated so that the wobble signal WB2 cannot be obtained. However, More sophisticated control is required in the manufacturing process. Also in this specific example, the comparator in the information recording / reproducing apparatus 200a cannot detect the wobble signal of the band-pass filter force as in the above-described specific example.
- the special area CDZa may be configured so that the wobble signal WB3 is obtained. More specifically, in all areas of the special area CDZa, for example, the wobble frequency may be modulated from ulation ⁇ to ⁇ and FM (Frequency Modulation). In FM, the frequency may be increased to 2 times, 5 times, etc., or may be reduced to 1/2 times, 1Z5 times, etc. In this specific example as well, the comparator in the information recording / reproducing apparatus cannot detect the wobble signal from the bandpass filter in the same way as the above specific example.
- FM Frequency Modulation
- the special area CDZa may be configured so that the wobble signal WB4 is obtained. More specifically, at least one of the wobble frequency, amplitude, and phase may be modulated in the special area CDZa. Also in this specific example, the comparator in the information recording / reproducing apparatus cannot detect the wobble signal of the band pass filter as in the above specific example.
- the special area CDZa which is at least a part of the control data zone CDZ is!
- the recording track itself such as a track may not be formed in advance.
- the comparator in the information recording / reproducing apparatus cannot detect the wobble signal having the bandpass filter power.
- FIG. 8 is a block diagram showing the overall configuration of an information recording / reproducing apparatus for pre-recording encrypted information on the information recording medium of the present invention and reproducing recorded information such as contents.
- pit data DP synchronized with the first clock signal CK1 is recorded according to the length of the recording mark.
- the recording mark is a pit
- the track is composed of a pit row.
- the track has a meandering shape according to the wobble signal WB.
- the wobble signal WB is synchronized with the first clock signal CK1.
- the information recording / reproducing apparatus 200a includes an optical pickup 202 that irradiates a reproduction beam to the optical disc 100 and outputs a signal corresponding to reflected light, a spindle motor 203 that controls the rotation of the optical disc 100, and a servo unit 222.
- the servo unit 222 is supplied with the first clock signal CK1 and the pit synchronization signal SYNCp. In synchronization with these signals, the servo unit 222 executes a spindle servo that controls the rotation of the spindle motor 203 and a focus servo and a tracking servo that are relative position controls of the optical pickup 202 with respect to the optical disc 100.
- the optical pickup 202 includes a laser diode that irradiates a reproduction beam and a quadrant detection circuit (not shown).
- the quadrant detection circuit divides the reflected light of the reproduction beam into four regions 1A, 1B, 1C, and ID shown in FIG. 8, and outputs a signal corresponding to the amount of light in each region.
- the head amplifier 204 amplifies each output signal of the optical pickup 202, and the divided read signal la corresponding to the region 1A, the divided read signal lb corresponding to the region IB, the divided read signal lc corresponding to the region 1C, and the region The divided read signal Id corresponding to the ID is output.
- the optical pickup 202 and the head amplifier 204 correspond to the optical pickup means according to the present invention.
- the sum generation circuit 210 adds the divided read signals la, lb, lc, and Id, and serves as an adder circuit that outputs the sum read signal SRF.
- the total read signal SRF is It is a signal representing the length.
- the pit data demodulating circuit 211 reproduces the pit data DP based on the total read signal SRF and also generates the first clock signal CK1. More specifically, the pit data DP is demodulated using a predetermined table to generate reproduction data. For example, when EFM modulation is adopted as a modulation method, a process of converting 14-bit pit data DP into 8-bit reproduction data is performed. Further, a descrambling process for rearranging the order of the reproduction data in accordance with a predetermined rule is executed, and processed reproduction data is output.
- the reproduction data obtained in this way is supplied to the pit data correction circuit 212 shown in FIG. 8, where it is subjected to error correction processing, interpolation processing, and the like, and then stored in the notch 213.
- the interface 214 sequentially reads the data stored in the notch 213, converts it into a predetermined output format, and outputs it to an external device. Furthermore, various data are input / output via the interface 214 to / from a line connection device (described later) connected to the external network 400, for example.
- the push-pull signal generation circuit 220 calculates (la + Id) (lb + lc) and generates a push-pull signal.
- the component (la + ld) corresponds to the regions 1A and 1D on the left side with respect to the reading direction, while the component (lb + lc) corresponds to the regions 1B and 1C on the right side with respect to the reading direction. That is, if the playback beam is biased to the left with respect to the pit, the push-pull signal is positive with respect to the center of amplitude, and if the playback beam is located at the center of the pit, the value of the push-pull signal is centered on the amplitude.
- the push-pull signal becomes negative with respect to the amplitude center.
- the relative position of the playback beam and the pit changes according to the meandering of the track, and the value of the push-pull signal indicates the relative position of the playback beam and the pit. That is, the push-pull signal is a signal corresponding to the meandering of the track.
- the push-pull signal is output to the servo unit 222 via the low-pass filter 221.
- the servo unit 222 performs tracking control based on the push-pull signal.
- the push-pull signal is supplied to the band pass filter 223.
- the pass band of the bandpass filter 223 is obtained by performing spread spectrum modulation on the wobble data DW during recording.
- the obtained wobble signal WB is set so that it can be extracted from the push-pull signal. Therefore, the band-pass filter 223 constitutes the above-described detection means together with the push-pull signal generation circuit 220, and the output signal thereof is a reproduction of the wobble signal WB from the optical disc 100.
- the comparator 224 cannot detect the recording clock and the recording address in the special area according to the present invention when attempting to write illegally to the second recording information recording area. Since an error occurs and the recording operation is stopped, it is possible to prevent illegal writing to the second recording information recording area regardless of the specifications of the information recording / reproducing apparatus including the pre-recording apparatus and the recording control procedure. Become. That is, the PLL (Phase Locked Loop) can be made uncontrollable.
- the PLL Phase Locked Loop
- the LPP detection circuit 230 is configured to detect an LPP signal based on the output signal A from the comparator 224 and the first clock signal CK1 generated by the pit data demodulation circuit 211.
- the LPP signal B can be output to the LPP demodulation circuit 230 and the servo unit 222.
- the LPP demodulation circuit 230 is configured to be able to demodulate the LPP signal B into preformat address information.
- the preformat address information can be output to the error correction circuit 229.
- the error correction circuit 229 performs error correction on the preformat address information demodulated by the LPP demodulation circuit 230.
- the CPU 250 performs overall control of each component of the information recording / reproducing apparatus 200a.
- FIG. 9 is a flowchart showing the pre-recording operation in the pre-recording apparatus 200 according to the present embodiment.
- a seek operation is performed by the optical pickup 202 under the control of a central processing unit (CCU) 250 of the pre-recording apparatus 200 (step S 101 ).
- CCU central processing unit
- optical disc 100 is an optical disc for content distribution (step S102).
- the optical disc 100 is If the optical disc is to be distributed (step S102: Yes), various control information and various management information necessary for the recording operation on the optical disc 100 are determined or acquired (step S103). More specifically, the OPC process is performed to determine the optimum recording power and the recording strategy pattern. The presence of an emboss pit is detected. Furthermore, the start address information indicating the start position of the control data zone CDZ to which the CAV control method is applied is obtained as preformat address information such as a land prepit.
- step S104 it is determined whether or not content has been recorded on the optical disc 100 (step S104).
- step S104 when the content has not been recorded on the optical disc 100 (step S104: No), a search is made for a predetermined address for pre-recording the encryption key information and preparation for pre-recording is performed (step S105). .
- step S106 the start position of the control data zone CDZ to which the CAV control method is applied is searched and detected based on the acquired start address information.
- step S106: Yes when the start position of the control data zone CDZ is detected (step S106: Yes), under the control of the CPU 250, the applied voltage or current output value of the spindle motor is fixed, and based on the CAV control method, Make the angular velocity constant (step S107).
- step S1 06 when the start position of the control data zone CDZ is not detected (step S1 06: No), the control to which the CAV control method is applied based on the acquired start address information is continuously controlled under the CPU 250. The start position of the data zone CDZ is detected (step S106).
- step S108 when the predetermined address is detected under the control of the CPU 250, pre-recording of the encrypted information is performed (step S108).
- step S109 it is determined whether or not the encryption key information has been pre-recorded for a predetermined length. If the encrypted information is pre-recorded for a predetermined length (step S109: Yes), the series of pre-recording operations is terminated.
- step S 109: No if the encryption key information is not pre-recorded for a predetermined length (step S 109: No), the encryption key information is pre-recorded (step S 108).
- step S 104 if it is determined in step S102 that the content is not an optical disc to be distributed (step S102: No), and the result of determination in step S104 is that there is no optical disc 100. If it is determined that the content has been recorded (step S 104: Yes), the optical disc 100 is ejected from the pre-recording device 200.
- FIG. 10 is a block diagram showing an overall configuration of an information recording apparatus that performs a general recording operation and an information distribution apparatus that performs a distribution operation on the information recording medium of the present invention.
- FIG. 10 Note that the step numbers in FIG. 10 correspond to the step numbers in FIG. 11 described later.
- the distribution system includes (i) an information recording / reproducing device 200a that performs a recording operation on the optical disc 100, and (ii) an encryption signal to the information recording / reproducing device 200a.
- Information distribution device 300 such as a web server, and (iii) information recording / reproducing device 200a and information distribution device 300 that can exchange information, such as the Internet. It is configured with an external network 400.
- the optical disc 100 is configured to include the NBCA, the control data zone CDZ, and the data area 102 for recording the encrypted content. More specifically, the media ID is recorded in NBCA by laser cutting. In the control data zone CDZ, encryption information Key 1 such as a disc key is recorded! In the data area 102, the encrypted content distributed by the information distribution apparatus 300 described later is recorded as it is.
- the information recording / reproducing apparatus 200a transmits the media ID of the optical disc 100 to the information distribution apparatus 300. Also, the encrypted content received from the information distribution apparatus 300 is recorded on the optical disc 100. [0108]
- the information distribution apparatus 300 receives the media ID transmitted by the information recording / reproducing apparatus 200a. It generates encryption key information Keyl such as a disc key corresponding to the received media ID and encryption information Key2 such as a title key. Based on the generated encryption key information Key 1 and Key 2, encryption processing such as encryption key is performed on the content.
- the encrypted content that is, encrypted content is distributed to the information recording / reproducing apparatus 200a. Since the encrypted content is distributed via the external network 400, encryption corresponding to eavesdropping and tampering such as SSL (Secure Socket Layer) is performed separately from the encrypted content in the encrypted key. You may give it.
- SSL Secure Socket Layer
- the external network 400 includes an information recording / reproducing device 200a and an information distribution device 300, both of which are connected to a line connection device (not shown) (for example, a hub device, a digital termination connection device (DSU), or an intrusion prevention device). Via a router equipped with a firewall application), so that information can be exchanged.
- a line connection device for example, a hub device, a digital termination connection device (DSU), or an intrusion prevention device.
- DSU digital termination connection device
- intrusion prevention device Via a router equipped with a firewall application
- FIG. 11 is a flowchart showing the distribution process in the information recording medium, information recording / reproducing apparatus, and information distribution apparatus of the present invention. Note that the step numbers in FIG. 11 correspond to the step numbers in FIG. 10 described above.
- step S 101a when the optical disc 100 is loaded, first, a seek operation is performed by the optical pickup 202 under the control of a CPU (Central Processing Unit) 250 of the information recording / reproducing apparatus described later (step S 101a ).
- a CPU Central Processing Unit
- step S102a it is determined whether or not the optical disc 100 is an optical disc for distributing content.
- step S102a various control information and various management information necessary for the recording operation on the optical disc 100 are acquired (steps).
- step S103a More specifically, when OPC processing is performed and the optimum recording power is determined In both cases, a recording strategy pattern is determined.
- step S104a it is determined whether or not content has been recorded on the optical disc 100 (step S104a).
- step S104a when the content is not already recorded on the optical disc 100 (step S104a: No), under the control of the CPU 250, the NBCA (Narrow Burst Cutting Area) on the optical disc 100 is used. An ID is acquired (step S105a).
- the acquired media ID is encrypted based on SSL or the like, and transmitted to the information distribution apparatus 300 such as a server on the network, for example (step S106a).
- step S102 when it is determined that the content is not an optical disc for distribution (step S102a: No), and as a result of the determination in step S104a, the optical disc 100 includes If it is determined that the content has been recorded (step S104a: Yes), the optical disc 100 is ejected from the information recording / reproducing apparatus 200a.
- Information distribution apparatus 300 first receives a media ID encrypted by SSL or the like (step S 201).
- the information distribution apparatus 300 decrypts the received media ID encrypted by SSL or the like (step S 202).
- encryption information Keyl such as a disc key corresponding to the decrypted media ID and encryption key information Key2 such as a title key are generated (step)
- step S204 the content and file system distributed using the generated encryption key information Key1 and Key2 are encrypted by a predetermined encryption system.
- the encrypted content and file system encrypted based on the encryption system using the generated encryption key information Key 1 and Key 2 are further converted to SSL or the like. And is distributed to the information recording / reproducing apparatus 200a (step S205). More specifically, encrypted content encrypted by SSL or the like and The attribute of the file system, so-called CCI (Copy Control Information), is set to the Never Copy attribute so that it cannot be played back during distribution.
- CCI Copy Control Information
- step S107a the encrypted content and file system encrypted by the SSL etc. distributed by the information distributing apparatus are received (step S107a).
- the information recording / reproducing apparatus 200a decrypts the received encrypted content and file system using SSL or the like (step S108a).
- the encrypted content and the file system encrypted by the encrypted information information Key 1 and Key 2 are directly recorded on the optical disc 100 without being decrypted (Ste S109a). More specifically, the encrypted content and the file system recorded in accordance with a predetermined encryption system V are the addresses of the last recording area of the lead-in area 101 that is not pre-recorded. Is started at the recording area address of the pre-recorded lead-out area 103. If the recording capacity of the encrypted content and the file system is pre-recorded and the recording area address of the lead-out area 103 is not recorded, the buffer data force S is recorded up to this address. Also good. In the lead-in area 101, the lead-out area 103, etc., the buffer data may be written in advance and sold, or the information recording / reproducing device 200a newly records the encrypted content. May be written.
- the distribution system allows the encrypted information Key and the information recording / reproducing apparatus 200a and the information distribution apparatus 300 to exchange encrypted information via the external network 400.
- FIG. 12 is a flowchart showing the flow of the reproducing operation according to a specific example of the embodiment of the information recording / reproducing apparatus for reproducing the information recording medium of the present invention.
- step S301 when the optical disc 100 is loaded, first, a seek operation is performed by the optical pickup 202 under the control of the CPU 250 (step S301).
- the type of the optical disc 100 is determined under the control of the CPU 250 (step S302).
- a media ID is acquired under the control of the CPU 250 (step S303).
- step S304 information on whether or not the optical disc 100 is a recordable information recording medium is acquired under the control of the CPU 250 (step S304). More specifically, the optical disc 100 can determine whether or not it is a recordable information recording medium by determining whether or not it is a force capable of detecting a wobble or the like.
- step S305 under the control of the CPU 250, information regarding the number of recording layers of the optical disc 100 is acquired, and it is determined whether or not the optical disc 100 is a multilayer information recording medium (step S305). That is, under the control of the CPU 250, it is possible to determine whether the optical disc 100 is a single layer type or a multilayer information recording medium having two or more layers. Here, when it is determined that the optical disc 100 is a multilayer information recording medium having two or more layers (step S305: Yes), information on the direction of the recording track of the optical disc 100 is acquired under the control of the CPU 250 ( Step S306). More specifically, it is possible to determine whether the optical disc 100 is a parallel type force or an opposite type.
- step S305 when it is determined that the optical disc 100 is not a multilayer information recording medium having two or more layers (step S305: No), since the optical disc 100 is a single layer information recording medium, the recording track Step S306 for obtaining information about the direction is omitted.
- step S307 the content and file system recorded in the user data area of the optical disc 100, for example! /, Are encrypted based on a predetermined encryption system! / It is determined whether or not it has been performed.
- step S307 when the content recorded in the data area 102 of the optical disc 100 is encrypted based on the encryption system (step S307: Yes), the encryption key information Key2 such as the title key is acquired. (Step S308).
- step S309 information related to the file system of the optical disc 100 is acquired under the control of the CPU 250 (step S309).
- the content that has been encrypted and recorded on the optical disc 100 is decrypted by the acquired encryption key information Key2 such as a title key (step 2). S310).
- each piece of decrypted content is played using the encryption key information Key2 such as a title key (step S311).
- step S307 when the content recorded in the user data area of the optical disc 100 is not encrypted based on the encryption system (step S307: No), the CPU
- the content is played under the control of the CPU 250 (step S313).
- a write-once optical disk such as a CD-R or a DVD-R
- the present invention is, for example, a wobble including a rewritable optical disk. It can also be used in optical information recording media such as all CD, DVD, and Blu-ray disc large-capacity recording media.
- the information recording medium according to the present invention can be used in the technical field of information recording media such as DVDs.
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Abstract
Description
Claims
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JP2006529081A JPWO2006006618A1 (ja) | 2004-07-13 | 2005-07-13 | 情報記録媒体 |
US11/632,204 US20070258349A1 (en) | 2004-07-13 | 2005-07-13 | Information Recording Medium |
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JP2004206182 | 2004-07-13 |
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Cited By (1)
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JP2009009699A (ja) * | 2006-03-24 | 2009-01-15 | Pioneer Electronic Corp | 情報記録媒体、情報記録装置及び方法、情報再生装置及び方法、並びに、コンピュータプログラム |
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- 2005-07-13 WO PCT/JP2005/012898 patent/WO2006006618A1/ja active Application Filing
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