JP4221883B2 - Data recording medium, data reproducing method and reproducing apparatus, and data recording method and recording apparatus. - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a data recording medium on which digital data including literary work data such as music is recorded and identification information enabling identification unique to the recording medium, and literary work data recorded on the data recording medium The present invention relates to a data reproducing method and reproducing apparatus for reproducing the data, and a data recording method and recording apparatus for recording copyrighted work data on a data recording medium.
[0002]
[Prior art]
In general, a CD (compact disc) is widely used as a disc-shaped recording medium in which audio data such as music data, which is copyrighted material data, is converted into digital data and recorded, and the data can be read by an optical reproducing means. It has been. CD is a recording medium having a diameter of 12 cm and capable of recording data of 600 MB or more. On this CD, digital data is recorded based on a standardized recording format. Based on the standard recording format of CDs, for example, CD-ROMs that record computer-processed data and television game software, CD-Rs that allow additional recording of data, and data rewriting CD-RW etc. are provided.
[0003]
Also, a DVD (Digital Versatile Disc) is provided as a data recording medium on which high-quality image information or the like is converted into digital data and recorded.
[0004]
CDs and DVDs are recording media that can be mass-replicated from the master disk and can be distributed in large quantities. Those that record literary data such as the same music or video information basically have the same form. Each sheet is stored and distributed in a storage body having a common form and design.
[0005]
In order to identify so-called package media that are distributed by storing independent recording media in which common copyrighted material data is recorded in a common storage body, they are attached to the storage body and recording medium that store the recording medium. Then, the serial number is printed on the printed matter stored in the storage body, or a seal printed with the serial number is attached.
[0006]
[Problems to be solved by the invention]
In the package media as described above, if the storage body or the printed matter stored in the storage body is provided with a serial number, the recording medium alone cannot be distinguished from other similar recording media. Also, if the sticker with the serial number printed is peeled off, or if the storage body or printed matter with the serial number written on it is lost, the correspondence between the serial number and the recording medium cannot be taken, and the serial number is completely unknown. End up. Furthermore, it becomes difficult to manage when only the recording medium is sent to another person alone.
[0007]
In addition, for example, in the case of optical discs, package media that have been widely distributed in the past are illegal copies that are legitimate and illegal when a stamper is produced by peeling the disc substrate from the optical disc and an illegal copy is produced. There is a problem that it is difficult to distinguish the product. Similarly, when a CD-R or CD-RW is used for copying, it is difficult to discriminate between a genuine product and an illegal copy product.
[0008]
Therefore, it is difficult to operate a restricting function such as restricting reproduction by detecting that such an illegally duplicated product is an illegally duplicated product by detection means on the playback device side. There is.
[0009]
SUMMARY OF THE INVENTION An object of the present invention is to provide a data recording medium capable of identifying a data recording medium of the same kind on which the same literary work data is recorded, and to manage the data recording medium on which the literary work data is recorded, It is an object of the present invention to provide a data recording method and recording apparatus for recording data on the data recording medium, and a data reproducing method and reproducing apparatus for reproducing data recorded on the data recording medium.
[0010]
[Means for Solving the Problems]
  In order to achieve the above object, a data recording medium according to the present invention is digital data including copyrighted work data.ButRecordIsIn addition, identification information enabling identification unique to the recording medium and discrimination information indicating the presence or absence of the identification information are recorded in advance.The identification information is subjected to error correction coding or error detection coding of a plurality of code sequences, and the identification information is authenticated with at least one sequence code.
[0011]
Here, the identification information enabling identification unique to the recording medium is information enabling identification with other recording media, and further, this information constitutes literary work data recorded on the recording medium. Contains information to identify individual content.
[0012]
Further, the identification information recorded on the data recording medium according to the present invention is subjected to error correction coding or error detection coding of a plurality of code sequences, and the identification information is authenticated by at least one sequence of codes.
[0013]
  Data reproduction method for reproducing data recording medium according to the present invention andRegenerationThe deviceError correction coding or error detection coding of multiple code sequences is performedRead discrimination information indicating whether or not there is identification information unique to the recording medium recorded in the data recording medium, and read the identification information when it is determined that the identification information exists by this discrimination information,Authentication of the identification information is performed with at least one series of error correction codes..
[0014]
  Further, the data recording medium according to the present invention includes a reflective film in which a physical shape change is formed at least in either the thickness direction or the track width direction. Further, the reflection film has a configuration in which the reflectance with respect to the reproduction light changes in the range of 0.5% to 10% with respect to the reflectance in the unrecorded state by thermal recording. That is, the data recording medium is provided with an additional recording area by the reflective film. In the additional recording area, digital data including at least literary work data is recorded, and identification information enabling identification unique to the recording medium and discrimination information indicating the presence or absence of the identification information are recorded.The identification information is subjected to error correction encoding or error detection encoding of a plurality of code sequences, and authentication is performed with at least one sequence of codes.
[0015]
  A data recording method and a recording apparatus for recording data on a data recording medium according to the present invention include a reflective film having a physical shape change at least in either the thickness direction or the track width direction. The film has a structure in which the reflectance with respect to the reproduction light is changed in a range of 0.5% or more and 10% or less with respect to the reflectance in the unrecorded state by thermal recording, and an additional recording area is provided by this reflecting film Additional recording is performed on the data recording medium. Then, the additional recording area is irradiated with laser light modulated by the additional recording signal, and the digital data including at least the copyrighted work data is added to the additional recording area by thermal recording that alters the reflective film and changes its reflectance. Are additionally recorded, and identification information that enables identification unique to the recording medium and determination information indicating the presence or absence of the identification information are additionally recorded.The identification information is subjected to error correction encoding or error detection encoding of a plurality of code sequences, and authentication is performed with at least one sequence of codes.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a digital recording medium, a data reproducing method and apparatus for reproducing data recorded on the data recording medium, and a data recording method and apparatus for recording data on the data recording medium will be described.
[0017]
First, the data recording medium according to the present invention will be described. This data recording medium is a disc-shaped recording medium 1 and, as shown in FIG. 1, main data such as copyrighted material data based on contents such as music is stored. A recording data recording area 2 to be recorded and a lead-in area 3 provided on the inner circumference side of the data recording area 1 are provided. Further, an identification unique to the recording medium is provided on the inner circumference side of the lead-in area 3. An identification information recording area 4 is provided in which identification information for enabling the recording is recorded.
[0018]
The disc-shaped recording medium 1 according to the present invention will be described in more detail. The disc-shaped recording medium 1 is recorded in accordance with a recording format used in a conventionally used CD (compact disc) or DVD (Digital Versatile Disc). First digital data to be recorded and second digital data to be recorded based on a recording format different from the recording format of the first digital data are recorded.
[0019]
The first digital data is literary work data based on content such as music and video, and constitutes main data recorded on the disc-shaped recording medium 1. The second digital data is combined with the first digital data to form high-quality audio data, or a part of the literary work data recorded as the first digital data, for example, literary work data is sung. And one of the data when the music is included. Furthermore, the second digital data includes signal-compressed audio data, image data, text data, and the like. Specific contents thereof include posters, jackets, lyrics, attached to the first digital data. Liner notes, interview voices and articles, new song guidance, etc. Furthermore, when the first digital data is copyrighted work data related to audio data, concert ticket lottery information, online live viewing information, etc. Furthermore, a URL (Uniform Resource Locator, so-called server) that is a contact point through a communication network such as the Internet to a creator who distributes the copyrighted work data corresponding to the first digital data or an author such as a performer. Homepage address, etc.).
[0020]
The second digital data recorded in addition to the first digital data is recorded by changing the shape of the recording pits constituting the first digital data and the position of the recording pits in the direction perpendicular to the track direction. Thus, the data can be reproduced without affecting the data reproduction of the first digital data. That is, when a playback device that can play back only digital data corresponding to the recording format of the first digital data is used, only the first digital data can be played back, and the second digital together with the first digital data can be played back. In a playback apparatus that enables data playback, the first and second digital data can be played back, and upward compatibility is guaranteed. Specifically, the first digital data is so-called pit edge recording modulated by the longitudinal edge or length of the recording track of the recording pit, whereas the second digital data tracks the recording pit. Recording is performed by displacing the position in the tracking direction in the track width direction, which is a direction orthogonal to the direction, or by changing the width of the recording pit in the track width direction. The amount of change in the position and shape of these recording pits is an error that makes it possible to read the first digital data when the first digital data is reproduced by a reproducing apparatus capable of reproducing only the first digital data. It is provided within a range that does not affect the reproduction of the first digital data within the range.
[0021]
As described above, in the disc-shaped recording medium 1 according to the present invention in which the second digital data having a different recording format is recorded together with the first digital data, each recording medium is individually identified. Recording medium specific identification information or individual ID is recorded. The identification information or individual ID is recorded in a recording form that can be read by an optical head that reads the first and second digital data. In the example of FIG. 1, this identification information or individual ID is an identification information record provided on the inner circumference side of the lead-in area 3 provided on the inner circumference side of at least the data recording area 2 in which the first digital data is recorded. Recorded in area 4.
[0022]
The recording area of the identification information or individual ID is not limited to the identification information recording area 4 provided on the inner circumference side of the disc-shaped recording medium 1, and is provided at least on the outer circumference side of the data recording area 2 in which the first digital data is recorded. Recording may be performed in a further outer peripheral side area of the lead-out area, a part of the lead-in area, or the like. As read-only optical discs on which data is recorded based on a CD or DVD recording format, the same type of optical discs are produced in large quantities using a stamper that transfers a concavo-convex pattern corresponding to digital data to be recorded. Therefore, the identification information or the individual ID is recorded by writing directly on the reflective film for each recording medium at or near the final process of the manufacturing process of the recording medium. A method for manufacturing the disc-shaped recording medium on which the individual identification information or the individual ID is recorded will be described later.
[0023]
The individual identification information or individual ID recorded on the disk-shaped recording medium 1 described above is recorded based on a recording format as shown in FIG. In FIG. 2, the first 32 bits, for example, are a synchronization part, and the area following the synchronization part is a recording part in which individual identification information or individual ID is recorded. The individual identification information or individual ID recorded in the recording unit is recorded after the information body is converted into data, specifically encrypted. Therefore, the recording unit in which the individual identification information or the individual ID is recorded is an encryption area. The encryption area includes, for example, a 16-bit music provider ID, a 32-bit medium number, a 16-bit manufacturing device ID, a 48-bit serial number, a 16-bit error correction code (ECC-A), or an error. It consists of a detection code (EDC-A) and a total of 128 bits.
[0024]
Here, the music supplier ID is information for identifying the copyright owner who owns or manages the copyright for producing or supplying each content constituting the copyrighted material data recorded on the disc-shaped recording medium. . The medium number is used for registering distribution of the disk-shaped recording medium. The manufacturing apparatus ID is information that identifies an apparatus that manufactures a disk-shaped recording medium, and is information that identifies a manufacturing apparatus that records a 48-bit serial number. This manufacturing apparatus ID itself is also used as a part of individual ID information for performing identification unique to the disk-shaped recording medium. The 48-bit serial number is the main part of the identification information or individual ID for individually identifying the disc-shaped recording medium, and can be assigned freely by the music provider who distributes the recording medium first. It does not have to be a number. Further, for example, a 64-bit error correction code (ECC-B) is continuously added to the encryption area, and the entire area including the head synchronization unit is composed of 224 bits.
[0025]
Here, for the 16-bit error correction code (ECC-A) or error detection code (EDC-A), for example, a generator polynomial is
g (x) = x¹⁶x¹²x^Five +1
It is generated by CRC (cyclic redundancy code). The generator polynomial g (x) may be arbitrarily set by a music provider who distributes the disc-shaped recording medium first. As a result, random “bit strings” can be surely eliminated. This code has a different purpose from the 64-bit error correction code (ECC-B) and is used for authentication of individual IDs, not for the purpose of original error correction and error detection. That is, it is possible to determine whether such an individual ID exists.
[0026]
For 64-bit error correction code (ECC-B), for example,
f (x) = x⁸ + X^Four + X^Three + X² +1
And when f (α) = 0,
G (x) = (x + 1) (x + α) (x + α² ) ... (x + α⁷ )
(24, 16, 9) using a Reed-Solomon code. This code has a correction capability capable of detecting and correcting 4 bytes or erasing 8 bytes.
[0027]
To summarize the above, two or more error correction codes (ECC) or error detection codes (EDC) are used, one is used for original error correction and error detection, and the other is discriminated unique to the disk-shaped recording medium. It is used for authentication of identification information or individual ID.
[0028]
In addition, for example, 128-bit data indicating identification information or individual ID data recorded in the encryption area is a public key method such as an RSA (Rivest, Shamir and Adleman) method or a common key such as a DES (Data Encryption Standard) method. Theft is protected by being encrypted using this method.
[0029]
The format of the individual ID shown in FIG. 2 is merely an example, the number of bits and the arrangement of each area can be arbitrarily set, and the type of each area may be increased or decreased. For example, a work ID for specifying individual work data recorded on the disc-shaped recording medium 1 may be recorded. This work ID is recorded in accordance with ISRC (International Standard Recording Code).
[0030]
Furthermore, it is illegal to write partial information of the individual ID, for example, a manufacturing apparatus ID, etc., in a predetermined part of the second digital data recorded in the data recording area 2 provided in the disk-shaped storage medium 1 shown in FIG. Safety and reliability such as copy prevention can be improved.
[0031]
Further, in the lead-in area 3 of the disc-shaped recording medium 1 shown in FIG. 1, presence / absence determination information indicating whether or not an individual ID exists is recorded in a predetermined position, for example, a user area. This is information for discriminating whether or not there is a recording medium to which the second digital data recorded in a different recording format is added as the individual ID presence / absence discriminating information or in addition to the first digital data. You may make it use as. Conversely, the determination information as to whether or not the second digital data having a different recording format is recorded may be used as the individual ID presence / absence determination information, and these are combined into one determination information. It may be recorded.
[0032]
Next, as shown in FIG. 1, the first digital data and the second digital data having a different recording format are recorded, and the disc-shaped recording medium 1 on which identification information unique to the recording medium or individual ID is recorded. A reproducing apparatus according to the present invention using the above will be described.
[0033]
As shown in FIG. 3, this reproducing apparatus is mounted on this apparatus, scans an area in which data of a disk-shaped recording medium 1 that is rotationally driven by a spindle motor 16 is recorded, and data recorded on the recording medium 1 The optical head 11 is read out. Data recorded on the disk-shaped recording medium 1 read by the optical head 11 is supplied to the RF amplifier 12. The reproduction RF signal output from the RF amplifier 12 is sent to the EFM (8-14 modulation) demodulator circuit 13 and EFM demodulated, and then sent to the lead-in readout circuit 14. Further, various servo signals such as tracking error signal and focus error signal output from the RF amplifier 12 and a reproduction clock signal from the EFM demodulating circuit 13 are supplied to the servo circuit 15, and various servo signals are output from the servo circuit 15. Is output. The spindle servo signal output from the servo circuit 15 is supplied to a spindle motor 16 for driving the disk rotation, the tracking servo signal and the focus servo signal are supplied to the biaxial actuator of the optical head 11, and the thread servo signal is supplied to the optical head 11. Is supplied to a thread drive motor of a thread mechanism 17 that moves the disk in the radial direction of the disk. Between the servo circuit 15 and the CPU (processor unit) 18, control commands, control data, and the like are transmitted and received.
[0034]
The lead-in reading circuit 14 supplies data read from the lead-in area 3 of the disc-shaped recording medium 1 to the presence / absence determination circuit 21. The presence / absence discriminating circuit 21 discriminates whether or not the data supplied from the lead-in area includes discrimination information indicating the presence / absence of an individual ID for identifying the recording medium. When the presence / absence discriminating circuit 21 determines that there is no discrimination information, the playback device is a disc-shaped recording medium on which only the first digital data recorded based on the recording format based on the CD or DVD format is recorded. The data is reproduced and the reproduced data is output from the output terminal 22.
[0035]
When the presence / absence discriminating circuit 21 determines that there is an individual ID, the reproducing apparatus supplies a control signal to the lead-in reading circuit 14 and moves the optical head 1 to the innermost circumference side of the disk-shaped recording medium 1 again to read. The information recorded in the in area 3 is read and the switch 23 for selecting the reproduction mode is turned on, and a signal including the individual ID supplied from the lead-in reading circuit 14 is sent to the individual ID identification circuit 24. In this example, it is assumed that an individual ID or identification information is also recorded in the lead-in area 3, but it is provided on the inner peripheral side of the lead-in area 3 as in the disc-shaped recording medium 1 shown in FIG. If the individual ID or the identification information is recorded in the identification information recording area 4, the information recorded in the identification information recording area 4 is read and sent to the individual ID identification circuit 24. The individual ID identification circuit 24 determines whether or not the individual ID is normally identified. When the individual ID is normal (OK), the second digital recorded on the disc-shaped recording medium 1 is further recorded in addition to the first digital data. Data is reproduced and the reproduced data is output from the first output terminal 25. When the individual ID cannot be normally identified (NG), a reproduction prohibition signal for digital data is output from the second output terminal.
[0036]
The reproducing operation of the reproducing apparatus according to the present invention will be described more specifically with reference to FIG.
[0037]
First, a disk-shaped recording medium is mounted in the first step S41, the lead-in area of the disk-shaped recording medium is accessed by the optical head 11, information recorded in the lead-in area is read, and presence / absence determination is performed in step S42. The discrimination information indicating the presence / absence of the individual ID is discriminated by the circuit 21. When it is determined that there is an individual ID, the process proceeds to step S43, and when it is determined that there is no individual ID, the process proceeds to step S47.
[0038]
In step S43, the presence / absence discriminating circuit 21 determines whether there is an individual ID. If YES, the process proceeds to step S44. If NO, the process proceeds to step S46, and the reproduction mode of data corresponding to the copyrighted work data is stopped or prohibited. To do. The determination in step S43 may be only a determination as to whether or not the individual ID is actually written. However, when the individual ID has the format shown in FIG. 2, an error correction code (ECC-A) is used. Or an error detection code (EDC-A) may be used to determine whether or not the individual ID is normally recognized. In step S44, it is determined whether or not the disc-shaped recording medium loaded by the presence / absence determination circuit 21 has second digital data having a recording format different from that of the first digital data. If YES, the process proceeds to step S45. Then, the reproduction mode for reproducing the disc-shaped recording medium 1 according to the present invention on which the first and second digital data are recorded is selected, and the first and / or second digital data is reproduced. If the determination result is NO data in step S45, the process proceeds to step S46, and the reproduction mode is stopped or prohibited.
[0039]
In step S47, the presence / absence discriminating circuit 21 determines whether there is an individual ID. If YES, the process proceeds to step S46 to stop the reproduction mode, and if NO, the process proceeds to step S48. In step S48, it is determined whether or not there is second digital data recorded in a recording format different from the first digital data in addition to the first digital data on the loaded disc-shaped recording medium. In some cases, the process proceeds to step S46 to stop the reproduction mode. In the case of NO, the process proceeds to step S49 to select a reproduction mode for reproducing the first digital data, and the data recorded on the disk-shaped recording medium is reproduced.
[0040]
In steps S47 and S48, data was copied from a disc-shaped recording medium on which the second digital data recorded in a recording format different from the first digital data was recorded in addition to the first digital data. In this case, even if the individual ID or the second digital data is copied, this is a step of stopping or prohibiting the reproduction of data, but one or both of these steps may be omitted.
[0041]
Here, as one specific example of the operation for determining whether or not there is an individual ID in step S43 or the like, the details of the operation for determining whether or not the individual ID is recognized normally are shown in FIG. An example of the format of the individual ID or identification information shown will be described with reference to FIG.
[0042]
In step S161 shown in FIG. 5, when the individual ID or identification information in the format shown in FIG. 2 is input or received by the playback apparatus, error correction using the error correction code ECC-B is performed in the next step S162. In S163, it is determined whether or not this error correction has been completed normally. When it is determined YES that error correction has been normally performed, the process proceeds to step S164, and when NO, the process proceeds to step S170 to perform a retry. In step S164, the 128-bit encrypted data in the encryption area shown in FIG. 2 is decrypted, and the process proceeds to step S165, where an error is generated by a 16-bit error correction code (ECC-A) or error detection code (EDC-A). Check.
[0043]
In the next step S166, it is determined whether or not there is an error, that is, the individual ID is authenticated. If NO (there is an error), the process proceeds to step S171, and processing in the case of an error, that is, illegal copying is performed. Recognizing that the data is broken, reproduction prohibition processing or the like is performed. If it is determined as YES (no error) in step S166, that is, if the individual ID is normally authenticated, the process proceeds to step S167 to authenticate or confirm the serial number or the like shown in FIG. In step S168, it is determined whether or not the authentication in step S167 has been normally performed. If NO, the process in the case where authentication is not possible is performed in step S172. If YES, the process proceeds to the next step. This corresponds to, for example, the operation in step S43 in FIG. 4 in the series of operations shown in FIG. 5. If YES in step S167, the process proceeds to the next step S44 shown in FIG.
[0044]
In the above description, the presence / absence discriminating information indicating whether or not the individual ID exists in the disc-shaped recording medium is an example. However, such presence / absence discriminating information may be omitted. When the ID recording position is determined in advance, the individual ID may be read directly. The main part of such an example is shown in FIG.
[0045]
That is, FIG. 6 shows a case where the reproduction RF signal is supplied to the individual ID reading circuit 27 and the individual ID is read by the individual ID reading circuit 27, and there is an individual ID according to the present invention. Reproduction is performed by a new format reproduction system 28 that reproduces a disc-shaped recording medium on which second digital data recorded in a recording format different from the first digital data in addition to the first digital data is recorded, and there is no individual ID In this case, reproduction is performed by the disc-shaped recording medium on which only the first digital data is recorded or the old format reproduction system 29 that reproduces only the first digital data. FIG. 6 is a diagram for explaining the concept of selection of the playback system in accordance with the presence or absence of individual IDs. It is necessary to independently provide the new format playback system 28 and the old format playback system 29 in one playback device. Absent.
[0046]
In addition to the first digital data, discriminating information indicating whether or not the disc is a disc-shaped recording medium on which second digital data recorded in a recording format different from the first digital data is recorded. The information may be recorded on a medium, and the presence / absence of an individual ID may be determined according to the disc type discrimination information. Further, even if the discrimination information is not recorded, the second digital is recorded by a predetermined recording method in which the recording pit is different from the recording method of the first digital data, for example, the shape and position of the recording pit in the track width direction. It may be determined that the data is recorded and the type of the disk-shaped recording medium is determined, thereby determining the presence or absence of the individual ID.
[0047]
For example, as shown in FIG. 7, the second digital data may be recorded by forming the width of the substantially central portion in the track direction of the recording pit.
Yes.
[0048]
As shown in FIG.₂ The length in the direction perpendicular to the track direction T in the substantially central portion of the track direction T, that is, the width W₁₁Is the length in the track direction T of the other part, that is, the normal width W₁₂Narrower width W₁₁Thus, the second digital data is recorded. Furthermore, a plurality of recording pits P₁ Land R formed between₁ And regular recording pit P₁ The second digital data is recorded by forming the concave portion 50 shallower than the depth of the first digital data.
[0049]
Here, the width W in the direction orthogonal to the track direction T at the substantially center of the track direction T.₁₁Is a recording pit P on which the second digital data is recorded₂ Has a period of 5T or more, and the regular recording pit P₁ Land R on which the second digital data is recorded by forming a recess 50 shallower than the depth of₁ Also, those having a period of 5T or more are used.
[0050]
The second digital data is recorded in a recording pit P having a period of 5T or more.₂ Recording pit P by recording₂ This is because the second digital data can be read with a sufficient detection output while preventing the attenuation of the detection output of the first digital data recorded by the above.
[0051]
Next, a procedure for manufacturing a disc to which the above-described discrimination information or individual ID is added will be described with reference to FIG.
[0052]
In FIG. 8, in a resist coating process 51, a photoresist is applied to a glass master, and in a next cutting process 52, an uneven pit pattern according to data to be recorded is cut to produce a master. This cutting is performed using a cutting apparatus that performs laser cutting as shown in FIG.
[0053]
The master disk on which the pit pattern has been laser-cut is developed and fixed in a development / fixing step 53, and then subjected to electrolytic plating on the surface in a metal master manufacturing step 54 to produce a mother master disk. The Next, a stamper is manufactured by a stamper forming step 55 based on the metal master, and a substrate of transparent resin such as polycarbonate (PC) or acrylic is manufactured through a substrate forming step 56 using this stamper. The pit pattern formed on the master in the above-described cutting process is transferred to the substrate manufactured here. On the surface side of the substrate where the pit pattern is formed, a reflective film is formed by sputtering in the next reflective film forming step 57.
[0054]
In the disc-shaped recording medium 1 according to the present invention, identification information or individual ID is recorded after the final manufacturing process of the recording medium or in a process near the final process. These identification information or individual ID is recorded using a reflective film formed on the disk-shaped recording medium 1.
[0055]
Here, the reflective film used in the disc-shaped recording medium according to the present invention is formed using a material that can record data in order to enable recording of identification information or individual ID in a later process. Further, the reflection film needs to be formed of a material that can optically read the identification information and individual ID recorded here.
[0056]
Therefore, the reflective film forming the additional recording area of the disc-shaped recording medium according to the present invention has a reflectance comparable to that of a CD or DVD, or a reflectance readable by a conventionally used optical head. The material is formed of a material whose reflectance of a light beam such as a reading laser beam is changed by thermal recording using laser light. That is, the reflective film is formed of a metal film that exhibits characteristics that change the reflectivity with respect to the light beam for reading in the range of approximately 0.5% to 10% by thermal recording. Specifically, Al is a metal film mainly composed of Al._100-x X_x Ag alloy film or Ag metal film mainly composed of Ag_100-x X_x Of the Ag alloy film.
[0057]
Reflective film is made of Al_100-x X_x X is composed of at least one element selected from the group consisting of Ge, Ti, Ni, Si, Tb, Fe, and Ag. The composition ratio x [atomic%] in the Al alloy film is selected to be 5 <x <50 [atomic%].
[0058]
In addition, the reflective film is made of Ag._100-x X_x X is composed of at least one element selected from the group consisting of Ge, Ti, Ni, Si, Tb, Fe, and Ag. In this case, The composition ratio x in the Ag alloy film is selected to be 5 <x <50 [atomic%].
[0059]
Such a reflective film is formed in a predetermined film thickness by, for example, a sputtering method. Then, on the reflection film formed on the disk substrate, on which the identification information and individual ID are recorded or recorded, a protective film is formed by spin coating in the next protective film coating process 58.
[0060]
Note that the identification information and the individual ID may be recorded on the reflective film in an information recording process performed after the reflective film is formed on the disk substrate. The identification information and the individual ID are recorded by thermal recording in which the reflectance is modulated by applying laser light to the reflective film.
[0061]
The additionally recorded additional recording portion slightly changes with respect to the reproduction output by the recording pit based on the change in the reflectance of the additional recording portion, that is, with respect to the reproduction output based on the increase or decrease in the reflectance. Therefore, by detecting this minute change, this minute detection output can be used as a reproduction signal for additional recording.
[0062]
The additional recording signal is actually low in density, low in band, and further, for example, by reproducing the same signal in a plurality of additional recording areas during additional recording, for example, reproducing at a plurality of locations, etc. By applying a reproduction method different from the normal one, if the reflectance change related to this additional recording is 0.5% or more, stable additional recording can be reproduced.
[0063]
However, if the reflectance change in this additional recording is too large, the difference between the zero cross level and the reproduction output becomes small, and this affects the reproduction output of the original recording. It is desired to be 0.5% or more and 10% or less.
[0064]
Next, an example of a cutting device used in the cutting process 52 shown in FIG. 8 for producing a master in the above-described disk-shaped recording medium manufacturing process will be described with reference to FIG.
[0065]
As shown in FIG. 9, the cutting device used here uses a He—Ne gas laser, an Ar gas laser, or the like as a laser light source 61 used for cutting a pit pattern corresponding to data to be recorded.
[0066]
Laser light emitted from the laser light source 61 is sent to the optical modulator 62, and modulation is performed according to data recorded by the optical modulator 62. The laser beam modulated by the optical modulator 62 is reflected by a reflecting mirror 66 and applied to a disc master 67 coated with a resist. The reflection mirror 66 is movably displaced by a movable mechanism so that the laser light from the light modulator 62 scans the inner and outer circumferences of the disc master 67.
[0067]
The optical modulator 62 used here has an EOM (electro-optic modulator) 62a whose refractive index changes depending on the applied voltage, and an EOD (electro-optic polarizer) 62b whose polarization changes depending on the applied voltage. In place of these EOM and EOD, an AOM (acousto-optic modulator) or AOD (acousto-optic polarizer) of a type that generates an acoustic dense wave in a medium by a piezoelectric element may be used.
[0068]
The information such as music that is the content constituting the first digital data recorded on the disc-shaped recording medium 1 according to the present invention based on the CD format conventionally used is the first supply source of this information. Input from the information supply source 63 to the first data generator 65. A signal from the subcode signal generator 64 is input to the first data generator 65 together with information from the first information supply source 63. The information and subcode input to the first data generator 65 are output as data converted into the CD format by the first data generator 65 and supplied to the EOM 62 a of the optical modulator 62. The EOM 62a is used to form a pit pattern based on a conventionally used CD recording format.
[0069]
Further, like information added to the first digital data, information constituting literary work data independent of the first digital data, etc., the recording method is different from that of the first digital data. Information constituting the second digital data recorded on the medium is input from the second information supply source 68 to the second data generator 69. The information input to the first data generator 65 is output by the second data generator 65 as data having a recording method different from that of the first digital data, and is supplied to the EOD 62b of the optical modulator 62. . The EOD 62b is used, for example, to record the second digital data by displacing the recording pits constituting the pit pattern formed based on the first digital data in the track width direction orthogonal to the extending direction of the recording track. .
[0070]
As described above, in addition to the first digital data corresponding to the first literary work data, the second digital data corresponding to the second literary work data is recorded, and the identification information for further identifying the recording medium Alternatively, the disc-shaped recording medium according to the present invention on which the individual ID is recorded is a communication such as the Internet to the author who distributes the copyrighted work data included in the individual ID or the second digital data. Various uses are possible using a URL which is a contact address via a network.
[0071]
Next, a reproducing apparatus for explaining a copy control or copy management method using the individual ID recorded on the disk-shaped recording medium as described above will be described with reference to FIG. In FIG. 10, portions common to the respective portions of the configuration of FIG. 3 described above are denoted by common reference numerals, and detailed description thereof is omitted.
[0072]
A disc-shaped recording medium as a widely distributed package medium in which an individual ID for identifying a recording medium is not recorded, such as a disc-shaped recording medium to which the present invention is applied, is recorded on this recording medium. Even if the copyrighted work data is copied, it becomes unclear which disk-shaped recording medium was copied to the parent. Therefore, it is difficult to regulate illegal copying or illegal distribution of copyrighted material data.
[0073]
In a disc-shaped recording medium to which the present invention is applied, an individual ID is recorded using a digital watermark. This digital watermark is recorded by so-called data hiding, which is embedded so as not to hinder the reproduction of the copyrighted work data by, for example, spread spectrum, so that the digital data is not only output as a digital signal. When converted to an analog signal and output, a digital watermark (WM) is embedded in the data, and even if copying is repeated, the digital watermark (WM) is inherited in the copied data. Can be followed.
[0074]
That is, in FIG. 10, the work data obtained from the EFM demodulating circuit 13 via the CIRC (cross interleaved Reed-Solomon code) error correcting circuit 19 is sent to the adder 20 and the individual data obtained from the RF amplifier 12 is obtained. The ID is identified and extracted by the individual ID identification circuit 161, sent to a digital watermark (WM) generation circuit 162, sent from the generation circuit 162 to the adder 20 by a method such as spread spectrum, and the work data itself by the adder 20 Is superimposed and added. The copyrighted work data on which the electronic watermark (WM) output from the adder 20 is superimposed is taken out as a digital output from the output terminal 163 or converted into an analog signal by a D / A (digital / analog) converter 164. It is taken out from the output terminal 165 as an analog output.
[0075]
Also, the copyrighted work data on which the digital watermark (WM) output from the adder 20 constituting the apparatus shown in FIG. 10 is superimposed is sent to the encryption circuit 166 and at least a part of the individual ID from the individual ID identification circuit 161 is sent. This information may be used as an encryption key to be encrypted by the encryption circuit 166 and taken out from the output terminal 167. As a result, the encrypted data output becomes an encrypted output unique to the individual ID, and becomes an extremely secure encrypted output.
[0076]
In the example described above, the playback device is configured to include the optical head 11 that plays back information from the disk-shaped recording medium. However, information can be additionally recorded in the additional recording area of the disk-shaped recording medium using the optical head 11. It may be configured as a recording apparatus.
[0077]
Although a detailed description is omitted, a recording apparatus that performs additional recording on a disk-shaped recording medium has substantially the same configuration as the reproducing apparatus described above, and a laser in which the optical head 11 is modulated according to information to be additionally recorded. It is configured such that additional recording can be performed by thermal recording in which the reflection film is altered by changing the reflectivity by irradiating light.
[0078]
As described above, according to the disc-shaped recording medium of the present invention, when the stamper is illegally produced by having the identification information or the individual ID, for example, by peeling the disc substrate from the optical disc, The effect of eliminating the identification information or individual ID when the disk substrate is peeled off can be obtained.
[0079]
The identification information or individual ID can be provided in both the pit and land areas. For example, the detection accuracy can be improved by preparing a fixed pit pattern and providing it on a relatively long land portion.
[0080]
Furthermore, by setting only the recording area for recording the identification information or individual ID as a groove in advance, the baseline of reflectance can be made constant, and detection accuracy can be improved.
[0081]
In addition, the disc-shaped recording medium according to the present invention has the second digital data recorded in a pit shape in which the substantially central portion in the track direction is narrowed, for example, when the disc substrate is peeled from the optical disc In addition, the pit shape remains. However, when copying using CD-R, CD-RW, or the like, the recording apparatus cannot obtain the pit shape as described above.
[0082]
In addition, the disc-shaped recording medium according to the present invention has parts of different recording formats that have different recording densities, for example, a recording density such as double density, so that, for example, when the disc substrate is peeled off from the optical disc A plurality of recording density parts remain. However, when copying using CD-R, CD-RW, or the like, the recording apparatus can obtain an effect that recording cannot be performed in different recording formats for each part as described above.
[0083]
As described above, according to the disc-shaped recording medium according to the present invention, for example, in the case of an optical disc adopting only identification information on a CD, an optical disc without identification information when illegally copied is Since it is equivalent to a general CD, it is difficult to determine whether it is a genuine product or an illegal copy product.
[0084]
However, as a disc-shaped recording medium configured as described above, for example, an optical disc is a combination of identification information or individual ID and a pit shape with a narrow central portion in the track direction or parts of different recording formats. In the case of illegal copies, there is no identification information or individual ID, and there is a pit shape with a narrow central part in the track direction and parts with different recording formats. It can be determined that the product is a product.
[0085]
Further, according to such an optical disc, when copying is performed by using a CD-R or CD-RW having identification information or individual ID, even if the identification information or individual ID exists, the optical disc is almost in the track direction. Since it is impossible to have a pit shape with a narrow central portion and parts with different recording formats, it is possible to determine that the copy is illegal.
[0086]
That is, according to such an optical disc, for example, it is possible to determine illegal duplicates by the detection means on the recording / reproducing apparatus side, so that reproduction restriction such as prohibition of reproduction functions in the recording / reproducing apparatus. it can.
[0087]
In the above description, the example in which a disk-shaped recording medium is used as the data recording medium to which the present invention is applied has been described. However, the present invention can also be applied to a card-type recording medium or a tape-shaped recording medium. Also, the data modulation scheme is not limited to EFM (8-14 modulation), and various modulation schemes such as 8-16 modulation can be used. In addition, various modifications can be made without departing from the scope of the present invention.
[0088]
【The invention's effect】
In the present invention, since the identification information that enables identification between the same kind of data recording media on which the same copyrighted work data is recorded is recorded on the data recording medium, the management of the data recording medium on which the copyrighted work data is recorded is managed. It can be done reliably, manage the location of the copyrighted work data recorded on the data recording medium, reliably prevent illegal copying of copyrighted work data, and protect the interests of the copyright holder .
[Brief description of the drawings]
FIG. 1 is a diagram showing a schematic configuration of a disc-shaped recording medium to which the present invention is applied.
FIG. 2 is a diagram for explaining an example of a recording format of an individual ID that is identification information for performing identification unique to a disc-shaped recording medium.
FIG. 3 is a block diagram showing a schematic configuration of a reproducing apparatus used for reproducing a disc-shaped recording medium to which the present invention is applied.
FIG. 4 is a flowchart for explaining a procedure for reproducing a disc recorded on a disc-shaped recording medium to which the present invention is applied;
FIG. 5 is a flowchart illustrating a procedure for authenticating an individual ID.
FIG. 6 is a diagram for explaining an example in which an individual ID is directly read and a reproduction operation is switched.
FIG. 7 is a plan view showing an example in which a substantially central portion in the length direction of a recording pit formed on a disc-shaped recording medium is transformed into second data.
FIG. 8 is a diagram for explaining an example of a procedure for manufacturing a disc-shaped recording medium to which the present invention is applied.
FIG. 9 is a diagram illustrating a schematic configuration of a cutting apparatus for manufacturing a master disk used for manufacturing a disk-shaped recording medium to which the present invention is applied.
FIG. 10 is a block diagram showing another example of a reproducing apparatus used for reproducing a disc-shaped recording medium to which the present invention is applied.
[Explanation of symbols]
1 disc-shaped recording medium, 3 lead-in area, 4 identification information recording area, 11 optical head, 12 RF amplifier, 13 EFM demodulating circuit, 14 lead-in reading circuit, 15 servo circuit, 21 individual ID presence / absence discriminating circuit, 24 individual ID identification circuit

Claims (35)

Digital data including at least literary work data is recorded, identification information enabling identification unique to the recording medium, and discrimination information indicating the presence or absence of this identification information are recorded in advance ,
A data recording medium in which the identification information is subjected to error correction coding or error detection coding of a plurality of code sequences, and the identification information is authenticated by at least one sequence of codes .   The data recording medium according to claim 1, wherein the identification information is recorded in an area inside a lead-in area provided on an inner circumference side of a data recording area in which the digital data is recorded.   2. The data recording medium according to claim 1, wherein the identification information is recorded in an area outside a lead-out area provided on an outer peripheral side of the data recording area in which the digital data is recorded.   2. The data recording medium according to claim 1, wherein the discrimination information is recorded in a lead-in area provided on an inner circumference side of a data recording area in which the digital data is recorded.   The data recording medium according to claim 1, wherein the identification information includes serial number information for identification with another data recording medium.   The data recording medium according to claim 1, wherein the identification information includes copyrighted work provider information indicating a provider of the copyrighted work included in the digital data.   The data recording medium according to claim 1, wherein the identification information includes literary work identification information for identifying the recorded digital data.   The data recording medium according to claim 1, wherein the identification information includes manufacturing apparatus information indicating a manufacturing apparatus of the recording medium.   The data recording medium according to claim 1, wherein the identification information is data-converted information.   The data recording medium according to claim 9, wherein the data-converted information is encrypted data.   The data recording medium according to claim 1, wherein the digital data is recorded in accordance with a modulation method of 8-14 modulation or 8-16 modulation.   The data recording medium according to claim 1, wherein the data recording medium is read-only. First digital data including at least literary work data, second digital data recorded by a recording method different from the recording method of the first digital data, and identification information for identifying the recording medium are preliminarily stored. Recorded ,
A data recording medium in which the identification information is subjected to error correction coding or error detection coding of a plurality of code sequences, and the identification information is authenticated by at least one sequence of codes . 14. The data recording medium according to claim 13, wherein discrimination information indicating whether or not at least one of the second digital data and the identification information exists is recorded in advance. 14. The data recording medium according to claim 13 , wherein the identification information is recorded in an area inside a lead-in area provided on an inner circumference side of a data recording area in which the first and / or second digital data is recorded. . 14. The data recording medium according to claim 13 , wherein the identification information is recorded in an area outside a lead-out area provided on an outer periphery side of a data recording area in which the first and / or second digital data is recorded. 15. The data recording medium according to claim 14 , wherein the discrimination information is recorded in a lead-in area provided on the inner circumference side of the data recording area in which the first and / or second digital data is recorded. The data recording medium according to claim 13 , wherein the identification information includes serial number information. 14. The data recording medium according to claim 13, wherein the identification information includes literary work provider information indicating a literary work data provider included in the first and / or second digital data. 14. The data recording medium according to claim 13 , wherein the identification information includes literary work identification information for identifying literary work data included in the first and / or second digital data. 14. The data recording medium according to claim 13 , wherein the identification information includes manufacturing apparatus information indicating a manufacturing apparatus for the recording medium. 14. The data recording medium according to claim 13 , wherein the identification information is data-converted information. The data recording medium according to claim 22 , wherein the data-converted information is encrypted data. 14. The data recording medium according to claim 13, wherein the first and / or second digital data is recorded according to a modulation method of 8-14 modulation or 8-16 modulation. The data recording medium according to claim 13 , wherein the data recording medium is read-only. 14. The data recording medium according to claim 13, wherein the first digital data is pit edge recording, and the second digital data is recorded by a change in pit shape. 14. The data recording medium according to claim 13, wherein the first digital data is pit edge recording, and the second digital data is recorded by a change in pit position. 14. The data recording medium according to claim 13, wherein the second digital data is at least one of compressed audio data, image data, and text data. 14. The data recording medium according to claim 13, wherein the second digital data includes information for connecting to a communication network. In a data reproduction method for reproducing a data recording medium on which digital data including at least copyrighted work data is recorded,
Read out discrimination information indicating the presence or absence of identification information that is subjected to error correction coding or error detection coding of a plurality of code sequences and performs identification unique to the data recording medium,
Next, when it is determined by the determination information that the identification information exists, the identification information is read out,
A data reproduction method for authenticating the identification information with at least one series of error correction codes . In a data reproducing apparatus for reproducing a data recording medium on which digital data including at least literary work data is recorded,
Read means for reading the discriminating information indicating the presence or absence of identification information for performing error correction coding or error detection coding of a plurality of code sequences and identifying the data recording medium unique to the data recording medium;
Control means for reading out the identification information when the reading means determines that the identification information exists in the data recording medium, and authenticating the identification information with at least one series of error correction codes ; A data reproducing apparatus having: A reflective film in which a physical shape change is formed at least in either the thickness direction or the track width direction;
The reflective film has a configuration in which the reflectance with respect to the reproduction light is changed in a range of 0.5% or more and 10% or less with respect to the reflectance of the unrecorded state by thermal recording, and an additional recording area by the reflective film Provided,
In the additional recording area, digital data including at least literary work data is recorded, identification information enabling identification unique to the recording medium, and discrimination information indicating the presence or absence of the identification information are recorded ,
A data recording medium in which the identification information is subjected to error correction coding or error detection coding of a plurality of code sequences, and authentication is performed with at least one sequence of codes . The data recording medium according to claim 32 , wherein the reflective film is made of a single layer metal film. A reflection film having a physical shape change at least in either the thickness direction or the track width direction is provided, and the reflection film has a reflectivity of 0 with respect to an unrecorded state due to thermal recording. With respect to a data recording medium that is configured to vary in a range of 5% to 10% and provided with an additional recording area by the reflective film,
Digital data including at least literary work data in the additional recording area by thermal recording that irradiates the additional recording area with laser light modulated by an additional recording signal, alters the reflective film, and changes its reflectance. And additionally recording identification information that enables identification unique to the recording medium and discrimination information indicating the presence or absence of this identification information ,
A data recording method in which the identification information is subjected to error correction coding or error detection coding of a plurality of code sequences, and authentication is performed with at least one sequence of codes . A reflective film in which a physical shape change is formed at least in either the thickness direction or the track width direction, and the reflective film has a reflectance with respect to reproduction light that is not recorded, due to thermal recording. It is configured to vary in the range of 0.5% or more and 10% or less, and comprises an optical recording means for a data recording medium provided with an additional recording area by the reflective film,
The optical recording means has a laser light irradiation means that is modulated in accordance with additional recording information on the data recording medium,
Digital recording including at least copyrighted work data can be additionally recorded in the additional recording area by thermal recording in which the reflection film is altered by changing the reflectivity by irradiation with the laser light, and recording medium-specific identification is possible. And additional identification information indicating the presence or absence of this identification information ,
A data recording apparatus in which the identification information is subjected to error correction encoding or error detection encoding of a plurality of code sequences, and authentication is performed with at least one sequence of codes .

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