Optical disk, optical recorder, optical reproducer, crytocommunication system and program license system
First Claim
Patent Images
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 such an optical disk;
means for encrypting information using a cipher key and any one such optical disk'"'"'s unique identification information, into encrypted information unique to that one optical disk; and
wherein said means for recording is capable of recording encrypted information unique to an optical disk in said first recording area of said optical disk.
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Abstract
The operating and other procedures of an optical disk application system of the type for which a network is used are simplified. Optical disks have auxiliary data recording areas, where different IDs for individual disks, and/or cipher keys and/or decoding keys for ciphers are recorded in advance in a factory. By using the IDs to release the soft ciphers, using the cipher keys when sending the ciphers, and using the decoding keys when receiving the ciphers, user authorization procedures are simplified.
197 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 such an optical disk; means for encrypting information using a cipher key and any one such optical disk'"'"'s unique identification information, into encrypted information unique to that one optical disk; and wherein said means for recording is capable of recording encrypted information unique to an optical disk in said first recording area of said optical disk. - View Dependent Claims (2, 3, 4, 5)
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Specification