Copyright protection system, recording device, and reproduction device
First Claim
1. A copyright protection system comprising a recording device for recording encrypted content on a recording medium and a reproduction device for decrypting the encrypted content recorded on the recording medium, the recording medium having an unrewritable area in which a media number unique to the recording medium is recorded, the recording device including:
- a generating unit operable to acquire the media number from the recording medium, and generate license information by performing a specific operation using the media number and decryption key so that the license information reflects both the media number and the decryption key, the decryption key being necessary to decrypt the encrypted content;
a recording unit operable to record the license information, a decryption information generated by using the decryption key, and the encrypted content on the recording medium, and the reproduction device including;
a judging unit operable to read the media number, the decryption information, and the license information from the recording medium, and judge whether the read license information can be obtained if the specific operation is performed using the read media number and the decryption key which can be obtained from the read decryption information;
a decrypting unit operable to read the encrypted content from the recording medium and decrypt the encrypted content using the decryption key obtained from the decryption information;
a reproduction unit operable to reproduce the decrypted content; and
a suppressing unit operable to control the unit of the reproduction device not to reproduce the content, if the judgment by the judging unit is in the negative.
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Accused Products
Abstract
A copyright protection system includes a recording device and a reproduction device. The recording device writes encrypted content, an encrypted content key for decrypting the encrypted content, and license information on a recording medium on which a unique media number has been recorded in an unrewritable state. The license information is generated using both the media number and the encrypted content key, and therefore reflects both values. The reproduction device reads the media number, the encrypted content key, and the license information from the recording medium, and judges whether the license information reflects both the media number and the encrypted content key. The reproduction device decrypts the encrypted content key, and decrypts the encrypted content using the content key only if the license information reflects both values. Thus, the copyright protection system allows only original recording media to be reproduced, and prohibits reproduction of copy recording media.
31 Citations
18 Claims
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1. A copyright protection system comprising a recording device for recording encrypted content on a recording medium and a reproduction device for decrypting the encrypted content recorded on the recording medium, the recording medium having an unrewritable area in which a media number unique to the recording medium is recorded,
the recording device including: -
a generating unit operable to acquire the media number from the recording medium, and generate license information by performing a specific operation using the media number and decryption key so that the license information reflects both the media number and the decryption key, the decryption key being necessary to decrypt the encrypted content;
a recording unit operable to record the license information, a decryption information generated by using the decryption key, and the encrypted content on the recording medium, and the reproduction device including;
a judging unit operable to read the media number, the decryption information, and the license information from the recording medium, and judge whether the read license information can be obtained if the specific operation is performed using the read media number and the decryption key which can be obtained from the read decryption information;
a decrypting unit operable to read the encrypted content from the recording medium and decrypt the encrypted content using the decryption key obtained from the decryption information;
a reproduction unit operable to reproduce the decrypted content; and
a suppressing unit operable to control the unit of the reproduction device not to reproduce the content, if the judgment by the judging unit is in the negative. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. The recording device for recording encrypted content on a recording medium, the recording medium having an unrewritable area in which a media number unique to the recording medium is recorded, comprising:
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a generating unit operable to acquire the media number from the recording medium, and generate license information by performing a specific operation using the media number and decryption key so that the license information reflects both the media number and the decryption key, the decryption key being necessary to decrypt the encrypted content; and
a recording unit operable to record the license information, a decryption information generated by using the decryption key, and the encrypted content on the recording medium.
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10. A reproduction device for decrypting encrypted content recorded on a recording medium, wherein the encrypted content, decryption information necessary to decrypt the encrypted content, and license information used for judging whether the encrypted content is permitted to be decrypted are recorded on the recording medium, and the recording medium has an unrewritable area in which a media number unique to the recording medium is recorded, comprising:
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a judging unit operable to read the media number, the decryption information, and the license information from the recording medium, and judge whether the read license information can be obtained if a specific operation is performed using the read media number and the decryption key which can be obtained from the read decryption information;
a decrypting unit operable to read the encrypted content from the recording medium and decrypt the encrypted content using the decryption information;
a reproduction unit operable to reproduces the decrypted content; and
a suppressing unit operable to control the unit of the reproduction device not to reproduce the content, if the judgement by the judging unit is in the negative.
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11. A copyright protection method for use in a copyright protection system including a recording device for recording encrypted content on a recording medium and a reproduction device for decrypting the encrypted content recorded on the recording medium, the recording medium having an unrewritable area in which a media number unique to the recording medium is recorded, comprising:
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acquiring, by the recording device, the media number from the recording medium;
generating license information by performing a specific operation using the media number and decryption key so that the license information reflects both the media number and the decryption key, the decryption key being necessary to decrypt the encrypted content;
recording, by the recording device;
the license information, a decryption information generated by using the decryption key, and the encrypted content on the recording medium;
reading, by the reproduction device, the media number, the decryption information, and the license information from the recording medium;
judging, by the reproduction device, whether the read license information can be obtained if the specific operation is performed using the read media number and the decryption key;
reading, by the reproduction device, the encrypted content from the recording medium;
decrypting, by the reproduction device, the encrypted content using the decryption information;
reproducing the decrypted content; and
suppressing the processing by the reproduction device not to reproduce the content, if the judgment in the judging is in the negative.
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12. A recording method for recording encrypted content on a recording medium, the recording medium having an unrewritable area in which a media number unique to the recording medium is recorded, comprising:
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acquiring the media number from the recording medium;
generating license information by performing a specific operation using the media number and decryption key so that the license information reflects both the media number and the decryption key, the decryption key being necessary to decrypt the encrypted content; and
recording the license information, a decryption information generated by using the decryption key, and the encrypted content on the recording medium.
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13. A reproduction method for decrypting encrypted content recorded on a recording medium, wherein the encrypted content, decryption information necessary to decrypt the encrypted content, and license information used for judging whether the encrypted content is permitted to be decrypted are recorded on the recording medium, and the recording medium has an unrewritable area in which a media number unique to the recording medium is recorded, comprising:
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reading the media number, the decryption information, and the license information from the recording medium;
judging whether the read license information can be obtained if a specific operation is performed using the read media number and the decryption key which can be obtained from the read decryption information; and
reading the encrypted content from the recording medium;
decrypting the encrypted content using the decryption key obtained from the decryption information;
reproducing the decrypted content; and
suppressing the processing of the reproduction method not to reproduce the content, if the judgment in the judging is in the negative.
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14. A recording program for use in a recording device for recording encrypted content on a recording medium, the recording medium having an unrewritable area in which a media number unique to the recording medium is recorded, the recording program having the recording device execute:
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acquiring the media number from the recording medium;
generating license information by performing a specific operation using the media number and decryption key so that the license information reflects both the media number and the decryption key, the decryption key being necessary to decrypt the encrypted content; and
recording the license information, a decryption information generated by using the decryption key, and the encrypted content on the recording medium.
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15. A reproduction program for use in a reproduction device for decrypting encrypted content recorded on a recording medium, wherein the encrypted content, decryption information necessary to decrypt the encrypted content, and license information used for judging whether the encrypted content is permitted to be decrypted are recorded on the recording medium, and the recording medium has an unrewritable area in which a media number unique to the recording medium is recorded, the decryption program having the reproduction device execute:
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reading the media number, the decryption information, and the license information from the recording medium;
judging whether the read license information can be obtained if a specific operation is performed using the read media number and the decryption key which can be obtained from the read decryption information;
reading the encrypted content from the recording medium;
decrypting the encrypted content using the decryption key obtained from the decryption information;
reproducing the decrypted content; and
suppressing the processing of the reproduction program not to reproduce the content, if the judgment by the judging is in the negative.
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16. A computer-readable storage medium storing a recording program for use in a recording device for recording encrypted content on a recording medium, the recording medium having an unrewritable area in which a media number unique to the recording medium is recorded, the recording program having the recording device execute:
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acquiring the media number from the recording medium;
generating license information by performing a specific operation using the media number and decryption key so that the license information reflects both the media number and the decryption key, the decryption key being necessary to decrypt the encrypted content; and
recording the license information, a decryption information generated by using the decryption key, and the encrypted content on the recording medium.
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17. A computer-readable storage medium storing a reproduction program for use in a reproduction device for decrypting encrypted content recorded on a recording medium, wherein the encrypted content, decryption information necessary to decrypt the encrypted content, and license information used for judging whether the encrypted content is permitted to be decrypted are recorded on the recording medium, and the recording medium has an unrewritable area in which a media number unique to the recording medium is recorded, the decryption program having the reproduction device execute:
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reading the media number, the decryption information, and the license information from the recording medium;
judging whether the read license information can be obtained if a specific operation is performed using the read media number and the decryption key which can be obtained from the read decryption information;
reading the encrypted content from the recording medium;
decrypting the encrypted content using the decryption key obtained from the decryption information;
reproducing the decrypted content; and
suppressing the processing of the reproduction program not to reproduce the content, if the judgment by the judging is in the negative.
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18. A recording medium comprising:
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an unrewritable area in which a media number unique to the recording medium is recorded; and
a rewritable area in which (a) encrypted content, (b) decryption information necessary to decrypt the encrypted content, and (c) license information that is obtained by a specific operation using the media number and the decryption key and that reflects both the media number and the decryption key are recorded.
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Specification