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Copyright protection system, recording device, and reproduction device

  • US 20030152222A1
  • Filed: 08/07/2002
  • Published: 08/14/2003
  • Est. Priority Date: 08/08/2001
  • Status: Active Grant
First Claim
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1. A copyright protection system comprising a recording device for recording encrypted content on a recording medium and a decryption 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 information so that the license information reflects both the media number and the decryption information, the decryption information being necessary to decrypt the encrypted content; and

    a recording unit operable to record the license information, the decryption information, and the encrypted content on the recording medium, and the decryption 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 read decryption information; and

    a decrypting unit operable to read the encrypted content from the recording medium and decrypt the encrypted content using the decryption information, only if the judgement by the judging unit is in the affirmative.

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