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Optical disk reading device using both a decipher key and disk identification information for decryption

  • US 6,408,285 B1
  • Filed: 11/30/1999
  • Issued: 06/18/2002
  • Est. Priority Date: 10/09/1995
  • Status: Expired due to Term
First Claim
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1. An information reproducing device for reading encrypted information from an optical disk comprising a first recording area and a second recording area, said device comprising:

  • means for reading encrypted information recorded by a first modulation method in a first recording area of such an optical disk said means including an optical reading head;

    means for reading disk identification information recorded by a second modulation method in a second recording area of the same optical disk said means including said optical reading head; and

    means for decrypting said encrypted information using at least both a decipher key and disk identification information unique to the optical disk.

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