Optical disk, optical recorder, optical reproducer, cryptocommunication system and program license system
First Claim
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1. An information recording device for recording information on an optical disk comprising a first recording area and a second recording area, said device comprising:
- means for recording information using a first modulation method into a first recording area of such an optical disk;
means for reading disk identification information recorded by a second modulation method in a second recording area of the optical disk; and
means for encrypting information, using at least both a cipher key and said disk identification information unique to the optical disk as encryption keys, into encrypted information unique to the same optical disk, and means for permitting recording of said encrypted information by said means for recording after confirming the content of a recording permission code in an input signal to said means for recording.
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Abstract
A device for recording information on an optical disk having first and second recording areas, which device can record information using a first modulation method into a first recording area, read disk identification information recorded by a second modulation method in a second recording area, encrypt information using both a cipher key and disk identification information unique to the optical disk, and permit recording of such encrypted information after confirming the content of a recording permission code in an input signal for recording.
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Citations
5 Claims
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1. An information recording device for recording information on an optical disk comprising a first recording area and a second recording area, said device comprising:
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means for recording information using a first modulation method into a first recording area of such an optical disk;
means for reading disk identification information recorded by a second modulation method in a second recording area of the optical disk; and
means for encrypting information, using at least both a cipher key and said disk identification information unique to the optical disk as encryption keys, into encrypted information unique to the same optical disk, and means for permitting recording of said encrypted information by said means for recording after confirming the content of a recording permission code in an input signal to said means for recording. - View Dependent Claims (2, 3, 4, 5)
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Specification