JP2002251828A - Recorder and method for recording, information processor and method for information processing, recording medium, program storing medium and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect copying of contents. SOLUTION: In a CD 51, voice data added with digital watermarks is recorded in the first session and copyright protection information for detecting copying of voice data generated based on data in a TOC (table of contents) is recorded in the second session.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus and method, an information processing apparatus and method, a recording medium, a program storage medium, and a program, and more particularly, to a recording apparatus and method for protecting the copyright of content, and an information processing apparatus. And a method, a recording medium, a program storage medium, and a program.

[0002]

2. Description of the Related Art A personal computer provided with a CD-R (Compact Disc-Recordable) drive device, or
The CD-R recorder is a so-called CD-DA (Compact Disc Digital Auditor) in which audio data as content is recorded.
o), the audio data can be read and the read audio data can be recorded on a CD-R without deteriorating the sound quality.

A personal computer provided with a CD-R drive device is a CD-R on which audio data is recorded.
-R, the audio data can be read out, and the read audio data can be further recorded on another CD-R without deteriorating the sound quality.

Similarly, a personal computer equipped with a CD-R drive can record downloaded audio data on a CD-R via the Internet.

[0005] Also in this case, the personal computer provided with the CD-R drive device reads the audio data from the CD-R in which the downloaded audio data is recorded, and degrades the read audio data to degrade the sound quality. It can be further recorded on another CD-R without having to do so.

On the other hand, a digital watermark technique is used to indicate the identity of such audio data. By detecting the digital watermark added to the audio data, for example, the source of the audio data can be known.

When a digital watermark is added to audio data read from a CD-DA or the like or downloaded audio data via the Internet, if such audio data is recorded on a CD-R, The audio data recorded in R includes a digital watermark as it is.

[0008]

SUMMARY OF THE INVENTION A CD-R having audio data recorded on a personal computer or a CD-R recorder
Or the original CD-DA is difficult to determine.

Further, even if the digital watermark technique is used, it cannot be determined whether the audio data is copied or original.

As described above, the CD-R on which the audio data is recorded
It is not possible to prevent the audio data from being copied repeatedly, for example, by reading the audio data from the CD-ROM and recording it on another CD-R.

The present invention has been made in view of such a situation, and an object of the present invention is to make it possible to detect a copy of a content.

[0012]

According to the present invention, there is provided a recording apparatus comprising: a digital watermark adding unit for adding a digital watermark to a content; and copy detection information for detecting a copy of the content based on data related to the content. , And recording control means for controlling the recording of the content to which the digital watermark is added and the copy detection information.

[0013] The duplication detection information generating means can generate duplication detection information based on the reproduction time of the content and the number of frames of the content.

[0014] The copy detection information generating means adds a key statement to at least one of before and after the related data related to the content, and applies a hash function to the related data to which the key statement has been added, thereby performing copy detection. Information can be generated.

[0015] The duplication detection information generating means can generate duplication detection information by encrypting related data relating to the content.

According to the recording method of the present invention, there is provided a digital watermark adding step of adding a digital watermark to a content, and copy detection information for generating copy detection information for detecting a copy of the content based on related data relating to the content. It is characterized by including a generating step and a recording control step of controlling recording of the content to which the digital watermark is added and the copy detection information.

[0017] The program of the first program storage medium of the present invention includes a digital watermark adding step of adding a digital watermark to the content, and copy detection information for detecting a copy of the content based on related data related to the content. , And a recording control step of controlling the recording of the content to which the digital watermark has been added and the copy detection information.

According to a first program of the present invention, there is provided a digital watermark adding step of adding a digital watermark to content, and a copy for generating copy detection information for detecting a copy of the content based on relational data relating to the content. It is characterized by including a detection information generating step and a recording control step of controlling recording of the content to which the digital watermark is added and the copy detection information.

According to the recording medium of the present invention, it is determined that the content to which the digital watermark is added is recorded together with the copy detection information for detecting the copy of the content, which is generated based on the related data relating to the content. Features.

The recording medium can record the content to which the digital watermark is added, together with the copy detection information generated based on the reproduction time of the content and the number of frames of the content.

In the recording medium, a key statement is added to at least one of before and after related data relating to the content,
A content to which a digital watermark has been added can be recorded together with copy detection information generated by applying a hash function to relational data to which a key sentence has been added.

The recording medium can record the content to which the digital watermark has been added, together with the copy detection information generated by encrypting the related data relating to the content.

[0023] The information processing apparatus of the present invention comprises a digital watermark detecting means for detecting a digital watermark added to the content recorded on the recording medium, and whether the duplication detection information recorded on the recording medium is valid. Copy detection information determining means for determining whether or not the content recorded on the recording medium has been copied based on the result of the digital watermark detection and the result of the determination by the copy detection information determining means And duplication determination means for performing the determination.

[0024] The information processing apparatus may further include a ripping means for ripping the content when it is determined that the content recorded on the recording medium is not copied.

[0025] The information processing apparatus may further include a reproducing means for reproducing the content when it is determined that the content recorded on the recording medium is not copied.

The copy detection information determining means can determine whether the copy detection information is valid based on the reproduction time of the content recorded on the recording medium and the number of frames of the content.

The copy detection information determining means adds a key sentence to at least one of before and after the related data related to the content, and obtains the hash data by applying a hash function to the related data to which the key sentence is added. Based on the data, it can be determined whether or not the copy detection information is valid.

[0028] The copy detection information judging means can judge whether or not the copy detection information is valid based on data obtained by encrypting related data relating to the content.

According to the information processing method of the present invention, there is provided a digital watermark detecting step for detecting a digital watermark added to a content recorded on a recording medium, and whether copy detection information recorded on the recording medium is valid. Whether or not the content recorded on the recording medium has been copied based on the result of the detection of the digital watermark, and the result of the detection of the digital watermark, And a duplication determination step of determining

[0030] The program of the second program storage medium of the present invention comprises a digital watermark detecting step of detecting a digital watermark added to the content recorded on the recording medium, and copy detection information recorded on the recording medium. The content recorded on the recording medium is copied based on the copy detection information determination step of determining whether the is valid or not, the digital watermark detection result, and the determination result of the copy detection information determination step. And a duplication determining step of determining whether or not copying has been performed.

According to the second program of the present invention, the digital watermark detecting step for detecting a digital watermark added to the content recorded on the recording medium, and the duplication detection information recorded on the recording medium are valid. Whether or not the content recorded on the recording medium has been copied based on the result of the detection of the digital watermark, and the result of the detection of the digital watermark, And a duplication determining step of determining whether

[0032] In the recording apparatus and method of the present invention, the first program storage medium, and the first program,
An electronic watermark is added to the content, copy detection information for detecting the copy of the content is generated based on the related data related to the content, and the recording of the content with the electronic watermark and the copy detection information is controlled. You.

In the recording medium of the present invention, a content to which a digital watermark is added is recorded together with copy detection information for detecting a copy of the content, which is generated based on relational data relating to the content.

In the information processing apparatus and method, the second program storage medium, and the second program according to the present invention, a digital watermark added to the content recorded on the recording medium is detected and recorded on the recording medium. It is determined whether or not the copy detection information is valid, and based on the result of the digital watermark detection and the result of the determination of the copy detection information, whether or not the content recorded on the recording medium is copied. Is determined.

[0035]

FIG. 1 is a block diagram showing the configuration of an embodiment of a recording apparatus according to the present invention for recording audio data on an original CD (Compact Disc).

The write information recording section 11 is a master.
The audio data, which is the content to be recorded on the glass disc 31 coated with the photoresist, is obtained from an external device (not shown) and recorded. The audio data recorded by the write information recording unit 11 corresponds to a CD-DA system, for example, a so-called linear PCM (Pulse Code Modulation) system with a sampling frequency of 44.10 KHz and a quantization bit number of 16 bits.

The copyright protection information adding unit 12 adds copyright protection information to audio data recorded in the write information recording unit 11.

The copyright protection information adding unit 12 acquires the audio data recorded from the write information recording unit 11,
The digital watermark adding unit 41 of the copyright protection information adding unit 12
A digital watermark is added to the acquired audio data. The digital watermark is embedded in audio data by, for example, adding a specific frequency component of the audio data or adding a specific phase component of the audio data. The information embedded as the digital watermark is, for example, the ID of audio data or the ID of the manufacturer of the CD.

The copyright protection information generating section 42 of the copyright protection information adding section 12 generates copyright protection information, which is information for detecting a copy of the audio data, based on the reproduction time of the audio data.

The copyright protection information adding unit 12 causes the write information recording unit 11 to record the audio data to which the digital watermark has been added and the generated copyright protection information.

The laser 13 is, for example, a blue or ultraviolet laser device such as an argon ion laser, and makes a laser beam incident on a noise eater 14. Noise eater 1
4 reduces the noise of the laser beam and reduces the EO (Electr
(o-Optical).

The EO modulator 15 is provided for the write information recording unit 11
Modulates the laser beam incident from the noise eater 14 on the basis of the audio data to which the digital watermark has been added and the copyright protection information supplied from the electronic device, and makes the modulated laser beam incident on the beam expander 16.

The beam expander 16 enlarges the diameter of the laser beam corresponding to the opening of an objective lens (not shown) provided in the head 17, and makes the laser beam having the enlarged diameter enter the head 17.

The head 17 is controlled by a head controller 18
The distance between the objective lens and the glass disk 31 is controlled to be constant, and the laser beam incident from the beam expander 16 is irradiated on the glass disk 31 coated with the photoresist.

The motor 19 rotates the glass plate 31. The rotation control unit 20 controls the rotation of the motor 19 so that the linear velocity of the glass plate 31 at the position where the head 17 emits the laser beam is constant.

The control section 21 controls the write information recording section 11 to the rotation control section 20, and the drive 22, and controls the entire recording apparatus.

The drive 22 reads a program or data recorded on the mounted magnetic disk 51, optical disk 52, magneto-optical disk 53, or semiconductor memory 54, and transfers the read program or data to the copyright protection information adding unit. 12

The glass disk 31 irradiated with the modulated laser beam based on the audio data to which the digital watermark is added and the copyright protection information is subjected to a process such as development, and pits are formed on the surface, and the digital watermark is formed. Is recorded, and the copyright protection information is recorded.

On the basis of the glass disk 31 on which the audio data is recorded by the recording apparatus according to the present invention, a stamper for producing a CD is created.

Although it has been described that the digital watermark and the copyright protection information are added to the audio data recorded in the writing information recording unit 11, the digital watermark and the copyright protection information are previously stored in the audio data generating apparatus. Add
You may make it supply to a recording device.

FIG. 2 shows a stamper created on the basis of the glass disk 31 on which audio data has been recorded by the recording apparatus according to the present invention, and based on the created stamper, data recorded on a molded CD 51 is recorded. FIG.

On the CD 51, data is recorded by two sessions of the so-called CD-EXTRA system.
In the first session, the CD 51 sequentially records audio data for each track following a TOC (Table of Contents) which is a lead-in indicating the start of data. The first session is closed with a readout indicating the end of the data.

In the example shown in FIG. 2, N pieces of audio data are recorded in order from track 01 to track N.

The second session of the CD 51 records the TOC and the copyright protection information following the lead-in, and is closed by the lead-out.

The same information as the TOC in the first session is recorded in the TOC in the second session.

FIG. 3 is a diagram showing an example of information recorded in the TOC. The information recorded in the TOC includes the reproduction time and the number of frames of audio data for each track.

FIG. 3 shows an example of information recorded in the TOC, which indicates that the reproduction time of the audio data of the first music is AA minutes and BB seconds, and that the audio data of the first music is composed of good frames. Is shown.

Similarly, as shown in FIG. 3, the information recorded in the TOC is such that the reproduction time of the audio data of the second music is CC minutes and DD seconds, and the audio data of the second music is composed of rolling frames. This indicates that the reproduction time of the audio data of the third music piece is EE minutes and FF seconds, and that the audio data of the third music piece is composed of hahaha frames.

FIG. 3 shows an example of the information recorded in the TOC, in which the reproduction time of the audio data of the Nth music is αα minutes ββ seconds, and the audio data of the Nth music is composed of an instep frame. It is shown that.

FIG. 4 is a view for explaining an example of copyright protection information generated based on information recorded in the TOC.

The copyright protection information generation unit 42 adds a key sentence before and after the reproduction time and the number of frames of the audio data for each track, which is information recorded in the TOC, and adds the key sentence. , A hash function is applied to the information recorded in the TOC to generate, for example, 20-byte copyright protection information.

The copyright protection information generation section 42 stores the key text in advance.

A hash function applied to information recorded in the TOC to which a key statement has been added is, for example, SHA (Secure
Hash Algorithm) or MD5 (Message Digest Algorithm)
m 5) etc. are used.

FIG. 5 is a diagram for explaining another example of the copyright protection information generated based on the information recorded in the TOC.

The copyright protection information generation unit 42 encrypts the reproduction time and the number of frames of the audio data for each track, which is information recorded in the TOC, with a key that is stored in advance, and converts the copyright protection information. Generate.

The copyright protection information generation unit 42 generates a DES (Data
Encryption Standard) or IDEA (International D)
The playback time and the number of frames of audio data are encrypted by a method such as ata Encryption Algorithm. The copyright protection information generation unit 42 may encrypt the reproduction time and the number of frames of the audio data using a public key cryptosystem, not limited to the common key cryptosystem.

The recording process of the recording apparatus will be described with reference to the flowchart of FIG.

In step S11, the write information recording unit 11 acquires audio data to be recorded on the glass disk 31 from a recording medium (not shown) or via a predetermined transmission medium. In step S12, the digital watermark adding unit 41 of the copyright protection information adding unit 12 adds a digital watermark to the audio data recorded in the write information recording unit 11, for example, by adding a specific frequency component. . The digital watermark adding unit 41 adds a digital watermark to all audio data recorded on the glass board 31. The digital watermark added to each audio data may include the same information or different information.

In step S13, the copyright protection information adding unit 12 generates TOC information indicating the reproduction time and the number of frames of the audio data based on the audio data recorded in the write information recording unit 11.

In step S14, the copyright protection information adding unit 12 generates copyright protection information based on the TOC information. For example, the copyright protection information adding unit 12 generates copyright protection information by adding a key statement to the information of the TOC and applying a hash function to the information of the TOC to which the key statement has been added. Alternatively, the copyright protection information adding unit 12 generates the copyright protection information by encrypting the TOC information by a method such as DES.

In step S15, the control section 21
By controlling the laser 13 to the rotation control unit 20, the audio data to which the digital watermark is added is recorded on the glass disk 31 as the first session.

In step S16, the control section 21
By controlling the laser 13 to the rotation control unit 20, the TOC and the copyright protection information are recorded as the second session,
The process ends.

As described above, the recording apparatus according to the present invention uses the CD
The audio data to which the digital watermark has been added is recorded as a first session on a glass disk 31 which is the original disk of, and the copyright protection information is recorded as a second session.

A glass disc 31 which is a master disc of a CD in which audio data and the like are recorded by a recording device records audio data to which a digital watermark has been added as a first session, and copyrights as a second session. CDs with protection information recorded can be manufactured.

FIG. 7 is a block diagram illustrating the configuration of a personal computer according to the present invention for ripping audio data recorded on the CD 51.

CPU (Central Processing Unit) 111
Actually executes various application programs such as a ripping program described later and an OS (Operating System). The ROM (Read-only Memory) 112 generally stores basically fixed data of programs used by the CPU 111 and calculation parameters.
A RAM (Random-Access Memory) 113 stores a program used in the execution of the CPU 111 and parameters that change as appropriate in the execution. These are interconnected by a host bus 114 composed of a CPU bus and the like.

The host bus 114 is connected to a PCI (Peripheral Component Interconnect / Interf
ace) bus and the like.

The keyboard 118 is operated by the user when inputting various commands to the CPU 111. The pointing device 119 is operated by the user when pointing or selecting a point on the screen of the display 120. The display 120 is a liquid crystal display device or
It consists of a CRT (Cathode Ray Tube) and displays various information as text or images. HDD (Hard Disk Drive)
121 drives a hard disk, and CPU 11
1 to record or reproduce a program or information to be executed.

CD-ROM (Compact Disc Read-Only Memor)
y) The drive 122 reads the audio data, the information recorded in the TOC, or the copyright protection information from the mounted CD 51 and supplies the read data to the CPU 111.

The drive 123 includes the mounted magnetic disk 141, optical disk 142, and magneto-optical disk 14.
3 or the data or the program recorded in the semiconductor memory 144, and reads the read data or the program into the interface 117 and the external bus 1
16, the bridge 115, and the RAM 113 connected via the host bus 114.

These keyboards 118 to drive 1
23 is connected to the interface 117, and the interface 117 is connected to the external bus 116 and the bridge 1
15 and the CPU 111 via the host bus 114.

FIG. 8 is a diagram for explaining a program executed by the personal computer having the configuration shown in FIG. The operating system 161 is a program for managing the entire personal computer, that is, the CPU 111 to the drive 123.

The ripping program 162 is a program for reading audio data recorded on the CD 51 mounted on the CD-ROM drive 122 and generating a file corresponding to the read audio data.

The ripping program 162 includes a digital watermark detecting section 171 and a copyright protection information generating section 172.

The digital watermark detecting section 171 detects a digital watermark added to the audio data recorded on the CD 51 mounted on the CD-ROM drive 122.

The copyright protection information generation section 172 generates copyright protection information based on information recorded in the TOC of the CD 51 mounted on the CD-ROM drive 122.

For example, the copyright protection information generation unit 172
A key statement is added before and after the playback time and the number of frames of the audio data for each track, which is information recorded in the TOC, and a SHA or MD5 is added to the information recorded in the TOC with the key statement added. By applying a hash function, for example, 20-byte copyright protection information is generated. When the copyright protection information is generated by applying the hash function, the copyright protection information generation unit 172 stores the key text securely.

Alternatively, the copyright protection information generation unit 172
The playback time and the number of frames of audio data for each track, which is information recorded in the TOC, are
Copyright protection information is generated by encrypting using a method such as S or IDEA.

When the copyright protection information is generated by encrypting the information recorded in the TOC, the copyright protection information generation unit 1
Reference numeral 72 securely stores a key used for encryption.

When the information recorded in the TOC is the same, the copyright protection information generation unit 172 transmits the same copyright protection information as the copyright protection information generated by the copyright protection information generation unit 42 in FIG. Generate.

The ripping process executed by the ripping program 162 will be described with reference to the flowchart of FIG. In step S101, the ripping program 162 stores the CD5 in the CD-ROM drive 122.
1 to obtain audio data.

In step S102, the digital watermark detection unit 171 of the ripping program 162 detects a digital watermark from the acquired audio data.

In step S103, the ripping program 162 determines whether or not a digital watermark has been detected from the audio data. The recorded information, and the TOC information and copyright protection information recorded in the second session are obtained.

[0094] In step S105, the ripping program 162 compares the information recorded in the TOC of the first session with the information recorded in the TOC of the second session.
It is determined whether the information recorded in the first session matches the information recorded in the TOC in the first session and the information recorded in the TOC in the second session. To copyright protection information generation unit 1
Reference numeral 72 generates copyright protection information based on the information recorded in the TOC.

For example, the copyright protection information generation unit 172
A key sentence stored in advance is added to the information recorded in the TOC, and a hash function is applied to generate copyright protection information. Alternatively, the copyright protection information generation unit 172 generates copyright protection information by encrypting information recorded in the TOC with a key stored in advance.

In step S107, the ripping program 162 determines whether or not the generated copyright protection information matches the copyright protection information read from the CD 51 in the processing in step S104. Is determined to match the read copyright protection information, since the original CD 51 is mounted,
Proceeding to step S108, ripping is performed, and the process ends.

If it is determined in step S107 that the generated copyright protection information does not match the read copyright protection information, the CD-R on which the audio data has been copied is mounted. Then, the ripping program 162 causes the display 120 to display a message indicating that the ripping is to be interrupted, and does not execute the ripping, and the process ends.

If it is determined in step S105 that the information recorded in the TOC of the first session does not match the information of the TOC recorded in the second session, the CD on which the audio data is copied Since -R is attached, the process proceeds to step S109, where the ripping program 162 displays a message to the effect that the ripping is interrupted on the display 120, does not execute the ripping, and ends the processing.

If it is determined in step S103 that a digital watermark is not detected, ripping is not restricted, and the flow advances to step S108, where the ripping program 162 executes ripping and ends the processing.

As described above, in the personal computer according to the present invention, the digital watermark is added to the audio data of the CD 51, and when the proper copyright protection information is recorded in the second session, the CD 51 is regarded as the original. Judge,
Allow ripping.

On the other hand, in the personal computer according to the present invention, when a digital watermark is added to audio data, and illegal copyright protection information is recorded in the second session, it is determined that the audio data is a copy. Judge and suspend ripping.

Further, the personal computer according to the present invention permits ripping when audio data is not added with a digital watermark because ripping is not restricted.

FIG. 10 is a flowchart for explaining another ripping process executed by the ripping program 162.

In step S 121, the ripping program 162 is loaded on the CD-ROM drive 122.
The copyright protection information recorded in the second session is obtained from the CD 51.

At step S122, the ripping program 162 determines whether or not the copyright protection information is recorded on the CD 51. If it is determined that the copyright protection information is recorded on the CD 51, the process proceeds to step S123. , And obtains information recorded in the TOC of the first session.

At step S124, the copyright protection information generation unit 172 of the ripping program 162
Copyright protection information is generated based on the information recorded in the.

In step S125, the ripping program 162 determines whether or not the generated copyright protection information matches the copyright protection information read from the CD 51 in the processing in step S121. Is determined to match the read copyright protection information, since the original CD 51 is mounted,
Proceeding to step S126, ripping is performed, and the process ends.

If it is determined in step S125 that the generated copyright protection information does not match the read copyright protection information, the CD-R on which the audio data has been copied is mounted. Then, the ripping program 162 causes the display 120 to display a message indicating that the ripping is to be interrupted, and does not execute the ripping, and the process ends.

If it is determined in step S122 that the copyright protection information is not recorded on the CD 51, the process proceeds to step S127, where the ripping program 162
The audio data is acquired from the CD 51 mounted on the CD-ROM drive 122.

In step S128, the digital watermark detection section 171 of the ripping program 162 detects a digital watermark from the acquired audio data.

In step S129, the ripping program 162 determines whether a digital watermark has been detected from the audio data. If it is determined that the digital watermark has been detected, the ripping program 162 inserts the CD-R on which the audio data has been copied. Therefore, the process proceeds to step S130, a message to the effect that the ripping is interrupted is displayed on the display 120, and the process ends without performing the ripping.

If it is determined in step S129 that a digital watermark is not detected, ripping is not restricted, and the flow advances to step S126, where the ripping program 162 executes ripping and ends the processing.

As described above, the personal computer according to the present invention determines that the CD 51 is the original when the valid copyright protection information is recorded in the second session, and permits ripping.

On the other hand, the personal computer according to the present invention determines that the audio data is a copy when the copyright protection information is not recorded and the digital watermark is added to the audio data. Interrupt ripping.

Further, the personal computer according to the present invention permits ripping when no copyright protection information is recorded and when no digital watermark is added to the audio data, since ripping is not restricted.

Since the user cannot know the key text or the encryption key used to generate the copyright protection information,
In recording audio data on a CD-R, it is not possible to record valid copyright protection information on the CD-R. Therefore, the personal computer according to the present invention prevents ripping from a CD-R in which audio data read out from a plurality of original CDs in song units or audio data obtained via the Internet or the like is recorded. be able to.

FIG. 11 is a block diagram showing the configuration of an embodiment of the reproducing apparatus for reproducing the audio data recorded on the CD 51 according to the present invention. The motor 201 rotates the CD 51 under the control of the rotation control unit 207. The optical system 202 includes a laser and an objective lens, irradiates a laser beam to the CD 51, detects a laser beam reflected from the CD 51, and outputs a signal corresponding to the detected laser beam to the RF amplification unit 203 and the focus servo. 204, a tracking servo 205, and an optical system feed servo 206.

The RF amplifier 203 amplifies the signal supplied from the optical system 202 and supplies the amplified signal to the focus servo 204, tracking servo 205, and clock / bit extractor 208.

The focus servo 204 includes an optical system 202
A signal for controlling the focus of the laser beam is generated on the basis of the focusing error signal supplied from the controller and the signal supplied from the RF amplifier 203, and the generated signal is supplied to the optical system 202.

The tracking servo 205 is provided for the optical system 20.
Based on the tracking error signal supplied from 2 and the signal supplied from the RF amplifier 203, a signal for controlling laser beam tracking is generated, and the generated signal is supplied to the optical system 202 and the optical system feed servo 205. .

The optical system feed servo 206 includes a controller 211
From the tracking servo 205
A signal for controlling the feed of the optical system 202 is generated on the basis of the signal supplied from the optical system 202, and the generated signal is supplied to the optical system 202.

The rotation control unit 207 receives the signal supplied from the clock / bit extraction unit 208 and the synchronization detection / demodulation unit 209.
The rotation of the motor 201 is controlled based on the signal supplied from the control unit 211 and the signal supplied from the control unit 211 so that, in principle, the linear velocity at the point where the optical system 202 irradiates the laser beam is constant. Next, the rotation of the CD 51 is controlled.

The clock / bit extracting section 208 extracts a clock and bit data based on the signal supplied from the RF amplifying section 203, and supplies the bit data to the synchronization detecting / demodulating section 209, respectively.

The synchronization detection / demodulation unit 209 detects frame synchronization, performs EFM demodulation on the bit data, supplies the demodulated bit data to the error correction unit 210, and supplies the subcode to the control unit 211.

The error correction section 210 has a CIRC (cross interl
Based on the eaved Reed-Solomon code, error correction of bit data and data interpolation processing are performed, and the bit data is supplied to a D / A (Digital-Analog) converter 212. The D / A converter 212 converts bit data, which is audio data, into an analog signal, and supplies the analog signal to the filter 213.

The filter 213 removes a signal out of a predetermined band of the analog signal and outputs an audio signal corresponding to the audio data.

The control unit 211 controls the optical system servo 20 based on the subcode supplied from the synchronization detection / demodulation unit 209 or the bit data supplied from the error correction unit 210.
6 and the rotation control unit 207.

The control section 211 includes a digital watermark detection section 231
And a copyright protection information generation unit 232.

The digital watermark detection section 231 is provided with the error correction section 2
The digital watermark added to the audio data supplied from 10 is detected.

The copyright protection information generation section 232 generates copyright protection information based on the information supplied from the error correction section 210 and recorded in the TOC of the CD 51.

For example, the copyright protection information generation unit 232
Before and after the reproduction time and the number of frames of the audio data for each track, which is information recorded in the TOC, a key sentence stored in advance is added, and the key sentence is added. A hash function such as SHA or MD5 is applied to the information to generate, for example, 20-byte copyright protection information. When the copyright protection information is generated by applying the hash function, the copyright protection information generation unit 232 stores the key text securely.

Alternatively, the copyright protection information generation unit 232
The playback time and the number of frames of audio data for each track, which is information recorded in the TOC, are
Copyright protection information is generated by encrypting using a method such as S or IDEA.

When encrypting information recorded in the TOC to generate copyright protection information, the copyright protection information generation unit 2
Numeral 32 securely stores a key used for encryption.

When the information recorded in the TOC is the same, the copyright protection information generation unit 232 transmits the same copyright protection information as the copyright protection information generated by the copyright protection information generation unit 42 in FIG. Generate.

The drive 214 includes the mounted magnetic disk 251, optical disk 252, and magneto-optical disk 25.
3 or the program or data recorded in the semiconductor memory 254 is supplied to the control unit 211.

With reference to the flowchart of FIG. 12, a description will be given of a process of reproducing audio data, which is executed by the reproducing apparatus.
In step S201, the control unit 211 causes audio data to be acquired from the mounted CD 51.

In step S202, the control unit 211
The digital watermark detection unit 231 detects a digital watermark from the audio data supplied from the error correction unit 210.

In step S203, the control unit 211
Determines whether a digital watermark has been detected from the audio data. If it is determined that a digital watermark has been detected, the process proceeds to step S204, where the information recorded in the TOC of the first session and the second Obtain TOC information and copyright protection information recorded in the session.

In step S205, the control unit 211
Is the information recorded in the TOC of the first session,
It is determined whether the information of the TOC recorded in the second session matches the information of the TOC recorded in the first session and the information recorded in the TOC of the second session.
If it is determined that the information matches the information of C, step S2
Proceeding to 06, the copyright protection information generation unit 232 generates copyright protection information based on the information recorded in the TOC.

In step S207, the control unit 211
Determines whether the generated copyright protection information matches the copyright protection information read from the CD 51 in step S204, and determines whether the generated copyright protection information and the read copyright protection information match. If it is determined that they match, it means that the original CD 51 has been mounted, so that step S20
Proceeding to step 8, the audio data recorded on the CD 51 is reproduced, and the process ends.

If it is determined in step S207 that the generated copyright protection information does not match the read copyright protection information, the CD-R on which the audio data has been copied is mounted. Then, the control unit 211 causes a display (not shown) to display a message indicating that the reproduction is to be interrupted, and ends the process without reproducing the audio data.

If it is determined in step S205 that the information recorded in the TOC of the first session does not match the information of the TOC recorded in the second session, the CD on which the audio data is copied Since the -R is mounted, the process proceeds to step S209, where the control unit 211 displays a message indicating that the reproduction is to be interrupted on a display (not shown), does not reproduce the audio data, and ends the processing.

If it is determined in step S203 that no digital watermark is detected, the reproduction is not restricted, and the process proceeds to step S208, where the control unit 211
The audio data is reproduced, and the process ends.

As described above, the reproducing apparatus according to the present invention uses a CD.
When a digital watermark is added to the audio data 51 and valid copyright protection information is recorded in the second session,
It is determined that the CD 51 is the original, and the reproduction of the audio data is permitted.

On the other hand, the reproducing apparatus according to the present invention
When a digital watermark is added to the audio data and illegal copyright protection information is recorded in the second session, it is determined that the audio data is a copy, and reproduction of the audio data is interrupted.

[0146] Further, when the digital watermark is not added to the audio data of the CD 51, the reproduction apparatus according to the present invention permits the reproduction of the audio data because the reproduction is not restricted.

FIG. 13 is a flowchart for explaining another reproduction process executed by the reproducing device.

In the step S221, the control unit 211
Acquires the copyright protection information recorded in the second session from the mounted CD 51.

In step S222, the control unit 211
Determines whether or not the copyright protection information is recorded on the CD 51. If it is determined that the copyright protection information is recorded on the CD 51, the process proceeds to step S223, where the copyright protection information is recorded on the TOC of the first session. Get the information you have.

At step S224, control unit 211
The copyright protection information generation unit 232 generates copyright protection information based on the information recorded in the TOC.

At step S225, the control unit 211
Determines whether the generated copyright protection information matches the copyright protection information read from the CD 51 in the process of step S221, and determines whether the generated copyright protection information and the read copyright protection information match. If it is determined that they match, it means that the original CD 51 has been mounted, so that step S22 is performed.
Proceeding to step 6, the audio data is reproduced, and the process ends.

If it is determined in step S225 that the generated copyright protection information does not match the read copyright protection information, the CD-R on which the audio data has been copied is mounted. Proceeding, the control unit 211 displays a message indicating that the ripping is to be interrupted on the display and does not reproduce the audio data,
The process ends.

If it is determined in step S222 that the copyright protection information is not recorded on the CD 51, the process proceeds to step S227, and the control unit 211 proceeds to step S227.
1 to obtain audio data.

In the step S228, the control unit 211
The digital watermark detection unit 231 detects a digital watermark from the acquired audio data.

In the step S229, the control unit 211
Determines whether a digital watermark has been detected from the audio data. If it is determined that the digital watermark has been detected, the process proceeds to step S230, and since the CD-R on which the audio data has been copied is attached, Is displayed on the display and the audio data is not reproduced, and the process ends.

If it is determined in step S229 that no digital watermark is detected, the reproduction is not restricted, and the flow advances to step S226, where the control unit 211
The audio data is reproduced, and the process ends.

As described above, the reproduction apparatus according to the present invention determines that the CD 51 is original and permits reproduction when valid copyright protection information is recorded in the second session.

On the other hand, the reproducing apparatus according to the present invention
When the copyright protection information is not recorded and the digital watermark is added to the audio data, it is determined that the audio data is a copy and the reproduction is interrupted.

Further, the reproduction apparatus according to the present invention does not restrict the reproduction when the copyright protection information is not recorded and the digital data is not added to the audio data of the CD 51. Allow playback.

Since the user cannot know the key text or the encryption key used to generate the copyright protection information,
In recording audio data on a CD-R, it is not possible to record valid copyright protection information on the CD-R. Therefore, the playback device according to the present invention can prevent the playback of the audio data read out from the original CD in song units or the CD-R recording the audio data obtained via the Internet or the like. .

[0161] It has been described that the recording device records the audio data as the content, and the personal computer and the reproducing device process the audio data as the content recorded on the CD. Data such as images or moving images, numerical values, or content such as programs may be used. For example, in data such as a numerical value or a program, copyright protection information can be generated by using the number of bytes which is the size of the data or the program instead of the reproduction time.

The series of processes described above can be executed by hardware, but can also be executed by software. When a series of processing is executed by software, a program constituting the software can execute various functions by installing a computer built into dedicated hardware or installing various programs. It is installed from a program storage medium to a possible general-purpose personal computer or the like.

The program storage medium for storing the program installed in the computer and made executable by the computer is shown in FIG. 1, FIG. 7, or FIG.
As shown in FIG. 1, a magnetic disk 51 (including a floppy disk), a magnetic disk 141, or a magnetic disk 251 and an optical disk 52 (CD-ROM (Compact Disc-Read On)
ly Memory), DVD (including Digital Versatile Disc)), optical disk 142, or optical disk 252,
A package medium including the magneto-optical disk 53 (including an MD (Mini-Disc)), the magneto-optical disk 143, or the magneto-optical disk 253, or the semiconductor memory 54, the semiconductor memory 144, or the semiconductor memory 254, or the program is temporarily stored. It is configured by a ROM 112 or an HDD 121 which is stored permanently or permanently.
The storage of the program in the program storage medium is performed using a wired or wireless communication medium such as a local area network, the Internet, or digital satellite broadcasting via an interface such as a router or a modem as necessary.

In this specification, the step of describing a program stored in a program storage medium is not limited to processing performed in chronological order according to the described order, but is not necessarily performed in chronological order. , And also includes processes executed in parallel or individually.

The program for executing the above-described series of processing is executed via a wired or wireless communication medium such as a local area network, the Internet, or digital satellite broadcasting via an interface such as a router or a modem as necessary. It may be installed on a computer.

[0166]

According to the recording apparatus and method of the present invention, the first program storage medium, and the first program,
An electronic watermark is added to the content, copy detection information for detecting the copy of the content is generated based on the related data related to the content, and the recording of the content with the electronic watermark and the copy detection information is controlled. As a result, a copy of the content can be detected.

According to the recording medium of the present invention, the content to which the digital watermark is added is recorded together with the copy detection information for detecting the copy of the content generated based on the related data relating to the content. Therefore, a copy of the content can be detected.

According to the information processing apparatus and method of the present invention, the second program storage medium, and the second program, the digital watermark added to the content recorded on the recording medium is detected, and the information is recorded on the recording medium. It is determined whether or not the recorded copy detection information is valid, and based on the result of the digital watermark detection and the result of the copy detection information determination, whether the content recorded on the recording medium has been copied. Since the determination is made, it is possible to detect a copy of the content.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an embodiment of a recording apparatus according to the present invention.

FIG. 2 is a diagram illustrating data recorded on a CD 51;

FIG. 3 is a diagram showing an example of information recorded in a TOC.

FIG. 4 is a diagram illustrating an example of copyright protection information.

FIG. 5 is a diagram illustrating an example of copyright protection information.

FIG. 6 is a flowchart illustrating a recording process of the recording apparatus according to the present invention.

FIG. 7 is a block diagram illustrating a configuration of a personal computer according to the present invention.

FIG. 8 is a diagram illustrating a program executed by a personal computer.

FIG. 9 is a flowchart illustrating a ripping process of the personal computer according to the present invention.

FIG. 10 is a flowchart illustrating another process of ripping the personal computer according to the present invention.

FIG. 11 is a block diagram showing a configuration of an embodiment of a reproducing apparatus according to the present invention.

FIG. 12 is a flowchart illustrating a playback process of the playback device according to the present invention.

FIG. 13 is a flowchart illustrating another reproduction process of the reproduction device according to the present invention.

[Explanation of symbols]

11 write information recording section, 12 copyright protection information addition section, 41 digital watermark addition section, 42 copyright protection information generation section, 51 magnetic disk, 52 optical disk, 53 magneto-optical disk, 54 semiconductor memory,
51 CD, 111 CPU, 112 ROM, 113
RAM, 121 HDD, 122 CD-ROM drive, 1
41 magnetic disk, 142 optical disk, 143
Magneto-optical disk, 144 semiconductor memory, 162
Ripping program, 171 digital watermark detection unit, 172 copyright protection information generation unit, 211 control unit, 231 digital watermark detection unit, 232 copyright protection information generation unit, 251 magnetic disk, 252 optical disk, 253 magneto-optical disk, 254 semiconductor memory

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5D044 AB05 BC05 CC06 DE22 DE50 DE54 EF05 FG18 GK12 GK17 HL08 5J104 AA14 AA15 LA03 LA06 NA12 PA14

Claims (20)

[Claims] An electronic watermark adding unit that adds an electronic watermark to the content; and a copy detection information generating unit that generates copy detection information for detecting a copy of the content based on relational data related to the content. And a recording control unit that controls recording of the content to which the digital watermark is added and the copy detection information. 2. The recording apparatus according to claim 1, wherein the duplication detection information generating unit generates the duplication detection information based on a reproduction time of the content and a number of frames of the content. 3. The duplication detection information generating means adds a key statement to at least one of before and after the relation data related to the content, and adds a hash function to the relation data to which the key statement is added. The recording apparatus according to claim 1, wherein the duplication detection information is generated by applying. 4. The recording apparatus according to claim 1, wherein the duplication detection information generating unit generates the duplication detection information by encrypting the related data related to the content. 5. A digital watermark adding step of adding a digital watermark to the content, and a copy detection information generating step of generating copy detection information for detecting a copy of the content based on related data related to the content. A recording control step of controlling recording of the content to which the digital watermark is added and the copy detection information. 6. A digital watermark adding step of adding a digital watermark to the content, and a copy detection information generating step of generating copy detection information for detecting a copy of the content based on relational data related to the content. And a recording control step of controlling recording of the content to which the digital watermark is added and the copy detection information, wherein the program storage medium stores a computer-readable program. 7. A digital watermark adding step of adding a digital watermark to the content, and a copy detection information generating step of generating copy detection information for detecting a copy of the content based on related data related to the content. And a recording control step of controlling the recording of the content to which the digital watermark is added and the copy detection information. 8. A content recorded with a digital watermark, together with copy detection information for detecting a copy of the content, generated based on relational data relating to the content. recoding media. 9. The content to which the digital watermark is added is recorded together with the copy detection information generated based on the reproduction time of the content and the number of frames of the content. A recording medium according to claim 1. 10. A key statement is added to at least one of before and after said relation data related to said content,
9. The content to which the digital watermark is added is recorded together with the copy detection information generated by applying a hash function to the relational data to which the key sentence is added. The recording medium according to the above. 11. The content to which the digital watermark is added is recorded together with the copy detection information generated by encrypting the related data related to the content. The recording medium according to the above. 12. An information processing apparatus for processing a content recorded on a recording medium, wherein: a digital watermark detecting means for detecting a digital watermark added to the content recorded on the recording medium; A copy detection information determining unit that determines whether the copy detection information recorded in the record is valid; and a result of the detection of the digital watermark and a result of the determination by the copy detection information determination unit. An information processing apparatus comprising: a copy determination unit configured to determine whether the content recorded on a medium is copied. 13. The information processing apparatus according to claim 12, further comprising a ripping unit that rips the content when it is determined that the content recorded on the recording medium has not been copied. . 14. The information processing apparatus according to claim 12, further comprising a reproducing unit that reproduces the content when it is determined that the content recorded on the recording medium is not copied. . 15. The duplication detection information judging unit judges whether the duplication detection information is valid based on the reproduction time of the content recorded on the recording medium and the number of frames of the content. The information processing apparatus according to claim 12, wherein: 16. The duplication detection information determining means adds a key sentence to at least one of before and after related data related to the content, and applies a hash function to the related data to which the key sentence is added. 13. The information processing apparatus according to claim 12, wherein it is determined whether or not the copy detection information is valid based on data obtained by performing the processing. 17. The duplication detection information determining means determines whether or not the duplication detection information is valid based on data obtained by encrypting related data relating to the content. 13. The information processing apparatus according to claim 12, wherein 18. An information processing method for an information processing apparatus for processing content recorded on a recording medium, comprising: a digital watermark detecting step of detecting a digital watermark added to the content recorded on the recording medium; A copy detection information determining step of determining whether or not the copy detection information recorded on the recording medium is valid; a result of detecting the digital watermark; and a result of determining the processing of the copy detection information determining step A copy determination step of determining whether or not the content recorded on the recording medium has been duplicated based on the above. 19. A program for information processing for processing content recorded on a recording medium, comprising: a digital watermark detecting step of detecting a digital watermark added to the content recorded on the recording medium. A copy detection information determining step of determining whether or not the copy detection information recorded on the recording medium is valid; a result of detecting the digital watermark; and a result of determining the process of the copy detection information determining step A copy determining step of determining whether or not the content recorded on the recording medium is duplicated based on the program. 3. A program storage medium storing a computer-readable program. 20. A program for causing a computer to execute processing of content recorded on a recording medium, comprising: a digital watermark detecting step of detecting a digital watermark added to the content recorded on the recording medium; A copy detection information determining step of determining whether or not the copy detection information recorded on the recording medium is valid; a result of detecting the digital watermark; and a result of determining the processing of the copy detection information determining step A copy determining step of determining whether or not the content recorded on the recording medium has been copied based on the program.