Optical disk, optical recorder, optical reproducer, crytocommunication system and program license system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 27, 2000
Grant Date -
N/A
app pub date -
Jun 9, 1997
filing date -
Oct 9, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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