JP2004265570A - Recording method of data, recording device, reproducing method, reproducing device, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording method of data, in which illegal copy to CD-R (Compact Disc Recordable) is suppressed, and to provide a recording device, reproducing method, reproducing device, and recording medium of the data. <P>SOLUTION: When there are no data recorded in a CD-R, identification information and data are recorded into the CD-R (steps 104, 114), and the identification information is stored in the device used in the recording (step 115). When data are recorded in CD-R, the identification information is read out from the CD-R, and when the read-out identification information is stored in the device, the data are permitted to be recorded into the CD-R (step 122), or when the read-out identification information is not stored in the device, the data are prohibited from being recorded in the CD-R (step 122). <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to a data recording method, a recording device, a reproducing method, a reproducing device, and a recording medium that can prevent unauthorized copying.

  A CD-R (Compact Disc Recordable) can easily write digital data by using a personal computer. A CD-R is a write-once type recording medium on which digital data can be written only once. However, by using appropriate writing software, digital data can be stored in an unrecorded area of the CD-R later. Additional writing can be performed, and the CD-R can be used as a write-once recording medium.

  For this reason, CD-Rs are widely used as recording media for digital data for recording various information such as music, images, and texts.

In addition, there are the following prior art documents, for example.
JP-A-2000-31114

  However, since a CD-R does not have a unique ID (IDentification) for specifying the CD-R, it is also used for illegal or nearly illegal copies. For example, it is used to take out only some songs from an album (music CD) and copy them to a CD-R, or to burn songs from a plurality of CDs together into one CD-R. Alternatively, music is collected via the Internet and stored on a CD-R, or the obtained music is burned to a CD-R and distributed to friends.

  In view of the above points, the present invention suppresses the distribution of content in song units in the case of an album, and as a result, exchange of songs has no meaning.

In the present invention,
When data is recorded on a recording medium by a recording device,
Reading identification information for identifying the recording medium from the recording medium,
When the recording device stores the read identification information, the recording device records the data on the recording medium.
In the present invention,
When data is recorded on a recording medium by a recording device,
When identification information for identifying this recording medium is not recorded on the recording medium, the identification information is created,
While recording the created identification information and the data on the recording medium,
A recording method characterized by storing the created identification information in the recording device.
Further, in the present invention,
When data is recorded on a recording medium by a recording device,
Determining whether or not identification information for identifying the recording medium is recorded on the recording medium;
As a result of this determination, when the identification information is not recorded on the recording medium, the identification information is created,
While recording the created identification information and the data on the recording medium,
Save the created identification information in the recording device,
As a result of the determination, when the identification information is recorded on the recording medium, the identification information is read from the recording medium,
When the recording device stores the read identification information, the recording device records the data on the recording medium.

  According to the present invention, music cannot be copied to the same disk using different personal computers, so that music is illegally copied and distributed.

1. 1. Configuration Example In FIG. 1, reference numeral 10 indicates a personal computer to which the present invention is applied, and reference numeral 20 indicates a CD-R copied by the personal computer 10. Also, in the following description, the content to be copied is music, and therefore, reference numeral 30 indicates a dedicated CD player.

  The personal computer 10 has a main body 11 having a general configuration, and includes a hard disk device 12, an encoder circuit 13, a recording circuit 14, a CD-R drive device 15, And a routine 100. In this case, although not shown, the main body unit 11 includes a CPU (Central Processing Unit), a hard disk device, a memory, an input / output interface, a user interface, and the like, and corresponds to a core portion of a general personal computer.

  Further, as shown in FIG. 2A, a plurality of songs (songs 1 to N) permitted to be copied are stored in the hard disk device 12 in a file format of a predetermined format. In this example, for the music 1 to music N stored in the hard disk device 12, the digital audio data is compressed by, for example, the ATRAC3 (registered trademark) (Adaptive TRansform Acoustic Coding 3 (Trade Mark)) method. It is assumed that

  Further, the hard disk device 12 is provided with a database DTBS as shown in FIG. 2A. The database DTBS lists a disk ID for identifying the CD-R 20, a number of music pieces recorded on the CD-R 20, and a total data amount (byte number) of the music piece as described later. Saved in format.

  The hard disk device 12 may be that of the main body unit 11, that is, may be a part of a hard disk device in which an OS (Operating System), an application, and the like of the personal computer 10 are installed. The encoder circuit 13 is for encrypting audio data of a song on the hard disk 12 when the song is copied to the CD-R 20. The type of the encryption is arbitrary.

  Further, at the time of recording (at the time of writing), the recording circuit 14 performs encoding processing for error correction on the recorded data and performs modulation processing for recording. The CD-R drive device 15 optically records a recording signal output from the recording circuit 14 on the CD-R 20.

  The details of the copy routine 100 will be described later. For example, the copy routine 100 has a content as shown in FIG. 3, and executes only an appropriate copy when copying a music piece to the CD-R 20. Although the copy routine 100 is stored in a storage unit (not shown), the storage unit may be the hard disk device 12.

  In this example, the CD player 30 is of a portable type, and includes a CD drive device 31, a reproduction circuit 32, a decoder circuit 33, and an amplifier. In this case, the CD drive device 31 optically reproduces a signal from a CD-R, and the reproduction circuit 32 performs demodulation processing and error correction decoding processing on the reproduced signal to convert the original audio data. Output.

  Further, the decoder circuit 33 performs a process of decrypting the encrypted audio data and a process of expanding the data of the compressed audio data. Reference numeral 35 indicates headphones.

  In such a configuration, when copying music stored in the hard disk device 12 to the CD-R 20, a copy routine 100 is executed in the personal computer 10 as follows.

2. General Copy This is a case where an arbitrary song among songs 1 to N prepared in the hard disk device 12 is copied to the CD-R 20.

  In this case, an unrecorded (unused) CD-R 20 is set in the CD-R drive device 15, and then the copy routine 100 is executed. Then, the processing of the copy routine 100 starts from step 101, and then in step 102, it is checked whether or not the CD-R 20 set in the CD-R drive device 15 has not been recorded.

  Here, “unrecorded CD-R” refers to a CD-R that has not been recorded by the recording method of the present invention. That is, an unrecorded CD-R indicates a CD-R in which a “disc ID” described later is not recorded in a predetermined recording area, and data and the like are recorded by a method not according to the recording method of the present invention. Even if it is a CD-R, if there is a valid unrecorded area, it is included in “unrecorded CD-R”.

  Then, in the case of an unrecorded CD-R, the process proceeds from step 102 to step 103, where a disk ID is formed. The disc ID is an identification code unique to the CD-R 20. In this example, a random number having a predetermined bit length is generated using information of hardware of the personal computer 10 as a seed, and the random number is processed. It is formed.

  Subsequently, in Step 104, as shown in FIG. 2B, the disk ID formed in Step 103 is recorded in a predetermined recording area of the CD-R 20. The check of unrecorded CD-Rs in step 102 is performed using the recorded disc ID.

  Thereafter, the process proceeds to step 111, and in this step 111, awaiting the designation of a song to be copied to the CD-R 20 among the songs 1 to N prepared in the hard disk device 12. Therefore, when a song (single or plural songs) to be copied is designated, the process proceeds from step 111 to step 112, where main key data for encryption is prepared. That is, sub key data is formed using the disk ID formed in step 103, and the main key data is encrypted with the sub key data. If there are a plurality of songs specified in step 111, the main key data after encryption is different for each song.

  Subsequently, the process proceeds to step 113, in which the file of the song specified in step 111 among the songs 1 to N prepared in the hard disk device 12 is encrypted. For this encryption, the main key data prepared in step 112 is used. When the encryption in step 113 is completed, the process proceeds to step 114, in which the song file processed in step 113 is recorded on the CD-R 20, as shown in FIG. 2B.

  Then, when this copy is completed, the process proceeds to step 115, where the database DTBS in the hard disk device 12 is updated. That is, in this case, since the music has been copied to the unrecorded CD-R 20, the disc ID formed in step 103, the number of music copied to the CD-R 20, and the total data amount (byte number) of the music Are written in the database DTBS as a set of these.

  At this time, the disc ID written in the database DTBS is the one formed in step 103, but is also the disc ID written in the CD-R 20 in step 104. Then, the process proceeds to step 116, and the copying of the music to the CD-R 20 ends.

  Therefore, according to steps 101 to 104 and 111 to 116, when an unrecorded CD-R 20 is prepared, the tune prepared in the hard disk device 12 is copied to the CD-R 20. Then, at that time, a unique disc ID is given to the CD-R 20, and the disc ID is also registered in the database DTBS. The reproduction of the CD-R 20 will be described later.

3. Additional copy by the same device This is a case where a tune is newly added to the CD-R 20 created in the above item 2 using the personal computer that created the CD-R 20. This additional copy is allowed.

  That is, the copy routine 100 is executed by setting the CD-R 20 created in the above item 2 in the CD-R drive device 15. Then, in step 102, since the CD-R 20 set in the CD-R drive device 15 is not an unrecorded CD-R, the process proceeds from step 102 to step 121.

  Then, in this step 121, the disk ID is read from the CD-R 20. Next, in step 122, it is determined whether or not the disk ID read in step 121 is included in the database DTBS. In this case, since the CD-R 20 has been created by the personal computer 10 before, the disc ID read from the CD-R 20 exists in the database DTBS.

  Therefore, the process proceeds from step 122 to step 111. Therefore, after that, the processing after step 111 is executed in the same manner as in the case of the above two items, so that the music can be copied to the CD-R 20 as described above. That is, additional copying can be performed.

  In this way, the CD-R 20 can additionally copy the music on the hard disk device 12 by using the personal computer that has created the CD-R 20.

4. When another personal computer having the same function as the personal computer 10 is used as the personal computer 10X, the personal computer 10X additionally copies music to the CD-R 20 created by the personal computer 10. Is the case. However, this additional copying is prohibited.

  That is, when the personal computer 10X executes the copy routine 100 for additional copying, as described in the above section 3, the disk ID is read from the CD-R 20 in step 121, and then in step 122, It is determined whether or not the disk ID read by the above is included in the database DTBS.

  However, in this case, since the CD-R 20 is created by the personal computer 10, there is no disc ID equal to the disc ID read from the CD-R 20 in the database DTBS of the hard disk device 12 of the personal computer 10X. Therefore, the process proceeds from step 122 to step 116, and ends the copy routine 100.

  Therefore, even if the personal computer 10X is a personal computer having the same function as the personal computer 10, the personal computer 10X cannot additionally copy music to the CD-R 20 created by the personal computer 10, and the ban is prohibited. It was done.

  This means that if a song is copied to the CD-R 20 by the personal computer 10, the song cannot be additionally copied to the CD-R 20 even if a personal computer having the same function as the personal computer 10 is prepared. ing. That is, the same CD-R 20 cannot copy songs using different personal computers.

  Therefore, when viewed from a personal computer other than the personal computer 10, the CD-R 20 is equivalent to a CD-ROM (Compact Disc Read Only Memory), and the recorded music is encrypted. Therefore, the CD-R 20 is inconvenient for illegal distribution, and can suppress the spread of copies.

5. Reproduction of CD-R 20 The CD-R 20 created according to the above item 2 or 3 can be reproduced by the CD player 30. That is, in the CD player 30, a signal is reproduced from the CD-R 20 by the CD drive device 31, and the reproduced signal is supplied to the reproducing circuit 32 to be demodulated and error-corrected. , And the signal of the encrypted song is extracted.

  These signals are supplied to the decoder circuit 33, and key data for decryption is formed using the extracted disk ID, and the signal of the music piece encrypted by the key data is decrypted. The signal of the tune is supplied to the headphones 35 through the amplifier 34. Therefore, the user can listen to the music recorded on the CD-R 20.

6. Others In the above description, the recording medium is the CD-R20, but a recording medium such as a DVD-R (DVD Recordable) capable of additional recording, a CD-RW (Compact Disc ReWritable) or a DVD-RW (DVD ReWritable) The present invention can be applied to any so-called rewritable recording media capable of repeatedly rewriting data, such as magnetic disks, magneto-optical disks, and semiconductor memories.

  Further, the information to be recorded is not limited to music (music), but may be images such as still images and moving images, texts such as sentences, data of various databases, programs, and the like. Good.

  Further, in the above description, the audio data of the music stored in the hard disk drive 12 is assumed to be data compressed. However, the audio data is uncompressed in the hard disk 12, and when copying to the CD-R 20, the data is encrypted prior to encryption. It may be compressed.

  The audio data of the music stored in the hard disk device 12 may be data-compressed and encrypted, and in that case, the encoder circuit 13 is not necessary. Further, the encoder circuit 13 can be realized by software processing of the main body 11 when the main body 11 has room.

1 is a system diagram illustrating one embodiment of the present invention. It is a figure for explaining this invention. 3 is a flowchart illustrating one embodiment of the present invention.

Explanation of reference numerals

  DESCRIPTION OF SYMBOLS 10 ... Personal computer, 11 ... Main part, 12 ... Hard disk drive, 13 ... Encoder circuit, 14 ... Recording circuit, 15 ... CD-R drive device, 20 ... CD-R, 30 ... CD player, 31 ... CD drive device, 32: playback circuit, 33: decoder circuit, 35: headphones, 100: copy routine

Claims (13)

When data is recorded on a recording medium by a recording device,
Reading identification information for identifying the recording medium from the recording medium,
When the recording device stores the read identification information, the data is recorded on the recording medium. When data is recorded on a recording medium by a recording device,
When identification information for identifying this recording medium is not recorded on the recording medium, the identification information is created,
While recording the created identification information and the data on the recording medium,
A recording method, wherein the created identification information is stored in the recording device. When data is recorded on a recording medium by a recording device,
Determining whether or not identification information for identifying the recording medium is recorded on the recording medium;
As a result of this determination, when the identification information is not recorded on the recording medium, the identification information is created,
While recording the created identification information and the data on the recording medium,
Save the created identification information in the recording device,
As a result of the determination, when the identification information is recorded on the recording medium, the identification information is read from the recording medium,
When the recording device stores the read identification information, the data is recorded on the recording medium. In the recording method according to claim 1, claim 2, or claim 3,
The process of recording the above data
Encrypting the data with key data formed using the identification information,
A recording method for recording the encrypted data on the recording medium. In the recording method according to claim 2 or 3,
A recording method, wherein the creation of the identification information is performed based on information unique to the recording device. In a recording device that records data on a recording medium,
Reading means for reading identification information for identifying the recording medium from the recording medium;
Storage means for storing the identification information;
Determining means for determining whether the identification information read by the reading means is stored in the storage means,
A recording apparatus characterized in that when the determination means determines that the identification information read by the reading means is stored in the storage means, the data is recorded on the recording medium. In a recording device that records data on a recording medium,
Determining means for determining whether or not identification information for identifying the recording medium is recorded on the recording medium;
Creating means for creating the identification information;
Storage means for storing the identification information,
When the determination unit determines that the identification information is not recorded on the recording medium, the creation unit creates the identification information,
The created identification information and the data are recorded on the recording medium,
A recording device, wherein the created identification information is stored in the storage unit. A recording device that records data on a recording medium,
Reading means for reading identification information for identifying the recording medium from the recording medium;
Creating means for creating the identification information;
Storage means for storing the identification information,
When the reading unit determines that the identification information is not recorded on the recording medium, the creating unit creates the identification information,
The created identification information and the data are recorded on the recording medium,
Storing the created identification information in the storage means,
When the reading means determines that the identification information is recorded on the recording medium, and when the identification information read by the reading means is stored in the storage means, the data is recorded in the storage medium. A recording device for recording on a medium. In the recording apparatus according to claim 5, 6, or 7,
A recording apparatus, wherein the data is encrypted with key data formed using the identification information and recorded on the recording medium. In the recording device according to claim 6 or 7,
The recording device, wherein the creation unit creates the identification information based on information unique to the recording device. Reading the identification information and the data from the recording medium on which the identification information and the data encrypted based on the identification information are recorded,
Decoding the read data into reproduced data based on the read identification information,
A reproduction method characterized by performing reproduction from the reproduction data. Reading means for reading the identification information and the data from the recording medium on which the identification information and the data encrypted based on the identification information are recorded;
Decoding means for decoding the read data into reproduction data based on the identification information read by the reading means;
A reproducing unit for reproducing the reproduced data obtained by the decoding unit. While data is recorded,
A recording medium characterized in that unique identification information is recorded on the recording medium stored in the device used for recording the data.

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