JP4403651B2 - Data reproducing apparatus and method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a data reproducing apparatus and method applied to, for example, music data.
[0002]
[Prior art]
As a method for protecting the copyright of music data, SCMS (Serial Copy Management System) and CGMS (Copy Generation Management System) are known. SCMS is adopted in CD (Compact Disc) and MD (Mini Disc), and the first generation copy is permitted and the second generation copy (grandchild copy) is prohibited. In CGMS, generation is restricted such as copy prohibition or how many generations copying is possible. In order to realize these copy restrictions, SCMS bits and CGMS bits are prepared separately from the content data. These are collectively referred to as SCMS / CGMS bits. When copying is performed, the generation information indicated by the SCMS / CGMS bit is advanced by one generation.
[0003]
[Problems to be solved by the invention]
By distinguishing between the original and the copy, it is possible to make the copy restriction more certain, and to give a privilege to the original owner, thereby further increasing the original value. The conventional copy restriction method cannot reliably distinguish between the original and the copy. That is, when copying, under the assumption that the recording device always rewrites the generation information represented by the SCMS / CGMS bit, it is possible to determine whether the content is an original or a copy based on the SCMS / CGMS bit. However, if the recording device does not update the SCMS / CGMS bit, the determination is not made correctly.
[0004]
Also, content may be transmitted on the main channel and SCMS / CGMS bits may be transmitted on the subchannel. As described above, when the content and the SCMS / CGMS bit are transmitted through different channels, for example, only a main channel is handled on a personal computer, and therefore information indicating whether the content is an original or a copy is lost. A CD-R (CD-Recordable) on which content processed by a personal computer is recorded cannot be distinguished from a CD sold as music software.
[0005]
Therefore, an object of the present invention is to provide a data reproducing apparatus and method capable of reliably distinguishing an original from a copy.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problem, the invention of claim 1 transmits content data accompanied by identification data indicating whether the content data is an original or a copy, and reproduces the transmitted content data. An identification data separating means for separating identification data attached to content data; identification data determining means for determining whether the content data is original or a copy from the separated identification data; When the separated content data is supplied to the playback unit and the content data is determined to be original according to the determination result, an additional service is provided and the content data is determined to be a copy. sometimes, along with providing different services and additional services, that it is impossible to copy A data reproducing apparatus for displaying a message.
[0007]
In the invention of claim 5 , the content data accompanied by identification data indicating whether the content data is original or a copy is transmitted, and when the transmitted content data is reproduced, the identification attached to the content data is transmitted. Separating the data, determining whether the content data is the original or a copy from the separated identification data, supplying the separated content data to the playback unit, and depending on the determination result, the content data is the original When it is determined that there is a service, an additional service is provided. When it is determined that the content data is a copy, a service different from the additional service is provided and a message indicating that the copy is impossible is displayed. This is a data reproduction method.
[0012]
In the present invention, identification data that is accompanied with the content data and prohibited from being copied and output is provided, so that it is possible to reliably distinguish between the original and the copy.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described. FIG. 1 illustrates the concept of one embodiment of the present invention. A content header 2A into which data related to the content 1A is inserted is added to the content 1A such as music data and image data. An original mark 3 (indicated by * in the drawing) is included in the content header 2A. The original mark 3 is digital data of a predetermined bit pattern, for example. Copying of the original mark 3 is completely prohibited. That is, neither digital output nor analog output is output.
[0014]
Accordingly, the original mark 3 is not included in the content header 2B of the copied content 1B. As another example, copying of the original mark 3 may be prohibited by prohibiting copying of the content header itself. Furthermore, the copy of the copy mark 3 may be substantially prohibited by changing the original mark 3 to a copy mark (indicated by dots) 4 having a predetermined bit pattern.
[0015]
Thus, since the original mark 3 is not output at the time of copying, the original mark 3 is not included in the content after copying even if the recording device does not have a function of rewriting bits related to copy restriction. Whether the content is an original or a copy can be determined by the presence or absence of the original mark 3. Therefore, it is possible to reliably perform copy restriction. In addition, a special service can be provided to the owner of the original content.
[0016]
FIG. 2 shows a configuration example for generating content data to which an original mark is added. In FIG. 2, content data is supplied to an input terminal indicated by 11. Content data such as music content data is supplied. The content data may be compressed and encoded in order to reduce the amount of data.
[0017]
As compression coding, MPEG2 (Moving Picture Experts Group Phase 2) AAC (Advanced Audio Coding), MP3 (MPEG1 Audio Layer III), ATRAC (Adaptive Transform Acoustic Coding), ATRAC3, etc. can be used. ATRAC3 improves ATRAC used in MD and realizes a higher compression ratio (about 1/10).
[0018]
Content data is supplied to the encryption circuit 12. As encryption, DES, RSA, or the like can be used. DES is one type of block encryption that performs encryption for each block. RSA is one of public key cryptosystems that use different key data for encryption and decryption. The output of the encryption circuit 12 is supplied to the error correction encoding circuit 13, and error correction encoding is performed. The output of the error correction encoding circuit 13 is supplied to the multiplexer 14.
[0019]
An original mark is supplied from the input terminal 15 to the multiplexer 14. The multiplexer 14 adds an original mark as a content header to the encrypted content data. Then, transmission content data in which an original mark is added to the encrypted content data is generated at the output terminal 16 of the multiplexer 14. Although not shown, the transmission content data is distributed via a network or the like. In FIG. 2, the original mark may be used as a key of the encryption circuit 12 as indicated by a broken line.
[0020]
FIG. 3 is a configuration example for reproducing and recording (copying) transmission content data generated as described above. Transmission content data is supplied to an input terminal indicated by 21, and is separated into encrypted content data and an original mark by an original mark separation circuit 22. The encrypted content data does not have an original mark. However, when adding a copy mark, the encrypted content data may have a copy mark. The encrypted content data is supplied to the error correction circuit 23 and subjected to error correction processing. The output of the error correction circuit 23 is supplied to the decryption circuit 24 for encryption, and the encryption is decrypted. The output of the decoding circuit 24 is taken out to the output terminal 25. A playback circuit (not shown) is connected to the output terminal 25, and content data such as music data is played back.
[0021]
The content data decrypted by the decryption circuit 24 is supplied to the input terminal a of the switch circuit 26. One output terminal b of the switch circuit 26 is derived as an output terminal 27. The other output terminal c of the switch circuit 26 is led out as an output terminal 28. A recording circuit (not shown) is connected to the output terminal 27, and content data is recorded (copied) on a recording medium. In addition, a display control unit (not shown) is connected to the output terminal 28, and a message indicating that copying cannot be performed, for example, “Cannot copy” is displayed.
[0022]
The original mark separated by the original mark separation circuit 22 is supplied to the original mark identification unit 29. When the transmission content data to be input includes the original mark, the separation mark 22 separates the original mark. If the input transmission content data is copied, the original mark does not exist, and therefore the original mark is not taken out from the separation circuit 22. Further, when adding a copy mark during copying, the copy mark is separated from the separation circuit 22.
[0023]
Based on the presence or absence of the original mark, the original mark identification unit 29 determines whether the input transmission content data is original or a copy, and generates a determination signal. The original / copy discrimination signal output from the identification unit 29 controls the switch circuit 26 and is taken out to the output terminal 30. A display unit (not shown) is connected to the output terminal 30 and displays whether the content is original content or copied content. Not only the display but also the information about the original or the copy may be notified to the system.
[0024]
In the switch circuit 26, the input terminal a is connected to the output terminal b by the output signal of the identification unit 29 indicating that the transmission content data is original. Thereby, the content data is supplied to the recording circuit through the output terminal 27, and the content is copied. That is, the first generation copy is possible. On the other hand, when the output signal of the identification unit 29 indicates that the transmission content data is a copy, the second generation and subsequent copies are prohibited, so that the input terminal a and the output terminal c of the switch circuit 26 are connected. The As a result, copying is prohibited and a display indicating that copying is not possible is displayed on the display unit.
[0025]
The content having the original mark is distributed to the user via the Internet by a website, for example. On the site side, the original can be made more attractive than the copy by giving a privilege to the content having the original mark, that is, the original content owner.
[0026]
FIG. 4 explains the provision of a privilege to the owner of the original content. Step S1 indicates that the user has accessed the site. For example, as one of the services provided on the site, a service for the owner of the original mark is set. The user transmits the content data with the original mark added to the site.
[0027]
In step S2, the site determines whether or not there is an original mark. If there is an original mark, in step S3, a service for the owner of the original content is provided. For example, benefits such as provision of concert information, preferential sale of concert tickets, and free download of predetermined songs are provided. If it is determined in step S2 that there is no original mark, in step S4, the provision of service is stopped and a message to the user is sent. For example, a message “This has no original mark” is sent to the user. In this case, a service for the copy owner may be provided as indicated by the broken line in step S5. Whether or not the user owns the copy can be determined by the presence of the copy mark in addition to the absence of the original mark.
[0028]
FIG. 5 shows a basic configuration of a recording apparatus (cutting apparatus) when the present invention is applied to a recording medium such as a read-only optical disk. When the original content is recorded on the optical disc and provided, it is preferable that the original mark and the optical disc have a close relationship. In the mastering apparatus, laser light emitted from a gas laser or a semiconductor laser is modulated by an optical modulator, and is applied to a disk-shaped glass master 44 coated with a photoresist as a photosensitive material by an optical pickup. Thereby, data is recorded. The glass master 44 is controlled by servos such as tracking, focus, and spindle.
[0029]
In the example of FIG. 5, a wobble key is supplied to the input terminal 41. The wobble key is supplied to the phase modulator 42. The phase modulator 42 is supplied with a sine wave wobbling signal from a terminal 43, and the phase of the wobbling signal is phase-modulated with a wobble key. A wobbling groove 45 is formed on the master 44 by the output of the phase modulator 42. Between 45 of the grooves is called a land. The wobbling groove 45 is continuously formed in a spiral shape from the inner periphery to the outer periphery. The wobbling groove information can be used for tracking servo, spindle servo, synchronous clock generation, or absolute address.
[0030]
FIG. 6 shows the phase modulation performed by the phase modulator 42. FIG. 6A is a sinusoidal wobbling signal having a frequency of, for example, 22.05 kHz. FIG. 6B shows a part of the wobble key. The phase modulator 42 controls the phase of the wobbling signal in accordance with “0” and “1” of the wobble key, and generates a phase-modulated wobbling signal as shown in FIG. 6C. A wobbling groove 45 is formed on the master 44 by the wobbling signal after the phase modulation. As shown in FIG. 6D, the phase of the wobbling signal every two periods may be modulated by each bit of the wobble key.
[0031]
In FIG. 5, data for generating original marks is supplied to an input terminal 46. The data for generating the original mark is content encryption key data. The original mark generation data and the wobble key (or part of the wobble key) are supplied to the converter 47. The converter 47 generates new data, that is, an original mark by conversion processing from the original mark generation data and the wobble key. As the conversion process, a hash operation can be used. Further, the original mark may be generated by mixing or encrypting the two data.
[0032]
Encrypted content data is supplied to the input terminal denoted by 49. The encrypted content data and the original mark from the converter 47 are supplied to the multiplexer 48. In the multiplexer 48, a content header including an original mark is added to the content data. The output of the multiplexer 48 is supplied to an optical pickup (not shown) and recorded as pits on the master 44. The pits are formed in the wobbling groove and / or on the land. This is done by forming a wobbling groove first and then forming pits. Both may be formed simultaneously.
[0033]
The glass master 44 recorded by the mastering device is developed and electroformed to create a metal master, then a mother disk is created from the metal master, and then a stamper is created from the mother disk. An optical disk is produced by a method such as compression molding or injection molding using a stamper. This optical disc has an original mark and is a medium for providing original content.
[0034]
When reproducing the optical disk manufactured in this way, the encrypted content data and the original mark can be reproduced by reproducing the pits. Also, a wobbling groove reproduction signal can be obtained, and the wobble key can be reproduced by phase-demodulating the reproduction signal. In order to decrypt the encryption, the original mark and the wobble key are used, and a conversion process opposite to the conversion process at the time of recording is performed to obtain wobble mark generation data. In other words, a wobble key is required to obtain wobble mark generation data. The wobble key is obtained after phase demodulating the reproduction signal of the wobbling groove and requires an optical disc. Therefore, the security of the original providing medium can be increased.
[0035]
FIG. 7 shows a basic configuration in the case of recording an original content downloaded by a personal computer, for example, in music distribution on a recordable optical disc. What is downloaded is data in which the original mark 53 is included in the encrypted content 51 and the content header 52. The original mark 53 is information (key or the like) necessary for decrypting content encryption. Reference numeral 54 denotes a recordable optical disc. As the recordable optical disk, a rewritable optical disk or a write-once optical disk is used.
[0036]
The optical disk 54 stores unique information (referred to as a unique disk ID) that can uniquely identify the disk. For example, a unique disk ID is recorded in the lead-in area 55 of the optical disk 54. The downloaded encrypted content is recorded on the optical disc 54, and the original mark 53 is supplied to the converter 56. The converter 56 is supplied with a unique disk ID. The converter 56 performs a conversion process such that a hash value is generated by calculating both the original mark and the unique disk ID. Instead of the conversion process, a mixing process or an encryption process may be performed.
[0037]
The output of the converter 56 is recorded on the optical disk 54. The output of the converter 56 is an original mark converted to a unique one for the disc. Further, the encrypted content 51 and the output of the converter 56 do not need to be recorded in the same area as long as they can be linked on the optical disc 54.
[0038]
As described above, the optical disc 54 recorded by the system of FIG. 7 is a medium for providing original content. That is, when content is reproduced from the optical disc 54, an original mark is required to decrypt the encryption. The original mark is obtained by performing reverse conversion processing on the converted original mark and the unique disc ID. That is, if there is no unique disk ID, an original mark is generated and the encryption cannot be decrypted. In this way, the security of the downloaded original content can be increased. Instead of the unique disk ID, a random number may be generated when the downloaded data is recorded on the optical disk 54. Further, when the optical disk 54 has a wobbling groove, it may be used instead of the unique disk ID.
[0039]
In the embodiment described above, audio content has been mainly described. However, the present invention is applied to content such as video data other than audio, electronic book, game software, movie software, and the like as described above. be able to. The original providing medium is not limited to the optical disc, and may be a semiconductor memory such as a removable flash memory.
[0040]
【The invention's effect】
As is apparent from the above description, according to the present invention, since the original mark prohibited from being copied is transmitted along with the content, the original and the copy can be reliably identified. In addition, the content owner can perform a service that gives a privilege only to the original owner. Thereby, it becomes more attractive to purchase the original, and the sales of the original can be expanded. Furthermore, the security of the original mark can be improved by closely relating the original mark and the original providing medium. That is, an original mark in a place that is not an original providing medium can be determined as a fake.
[Brief description of the drawings]
FIG. 1 is a schematic diagram for explaining an outline of an embodiment of the present invention.
FIG. 2 is a block diagram showing a configuration example for content data production in one embodiment of the present invention.
FIG. 3 is a block diagram illustrating a configuration example for recording or reproducing content according to an embodiment of the present invention.
FIG. 4 is a flowchart for explaining a service provided to an original owner in an embodiment of the present invention.
FIG. 5 is a block diagram showing a configuration example in which the present invention is applied to an optical disc mastering apparatus.
6 is a waveform diagram used for explaining the phase modulation operation in FIG. 5. FIG.
FIG. 7 is a block diagram showing a configuration example in which the present invention is applied to an optical disc recording apparatus.
[Explanation of symbols]
1A ... Original content, 1B ... Copied content, 2A, 2B ... Content header, 3 ... Original mark, 4 ... Copy mark, 42 ... Phase modulator, 44 ...・ Master disc, 45 ... Wobbling groove, 54 ... Recordable optical disc

Claims (5)

A data reproduction device for transmitting the content data accompanied by identification data indicating whether the content data is original or a copy, and reproducing the transmitted content data;
Identification data separating means for separating identification data attached to the content data;
Identification data discriminating means for discriminating whether the content data is original or a copy from the separated identification data;
Supplying the separated content data to the playback unit;
When it is determined that the content data is original according to the determination result, an additional service is provided,
A data reproducing apparatus that provides a service different from the additional service and displays a message that copying is impossible when it is determined that the content data is a copy.   The data reproducing apparatus according to claim 1, wherein the determination result is notified to the system.   2. The data reproducing apparatus according to claim 1, wherein the content data accompanied with the identification data is transmitted via a network.   The data reproducing apparatus according to claim 1, wherein the additional service is transmitted via a network. When the content data accompanied by identification data indicating whether the content data is an original or a copy is transmitted, and when the transmitted content data is reproduced,
Separate the identification data attached to the content data,
Determine whether the content data is original or a copy from the separated identification data,
Supplying the separated content data to the playback unit;
When it is determined that the content data is original according to the determination result, an additional service is provided,
A data reproducing method for providing a service different from the additional service and displaying a message indicating that copying is impossible when it is determined that the content data is a copy.

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