Optical disc for a master key, and a method and apparatus for optical-disc information management which inhibit and permit reproduction of main information from an illegal copy disc by using physical and logical security information
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Sep 15, 1998
Grant Date -
N/A
app pub date -
Sep 12, 1995
filing date -
Sep 30, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical disc for a key physically stores first security information. The optical disc logically stores second security information. The first security information is equal to security information physically recorded on a legitimate optical disc. The second security information is equal to security information logically recorded on the legitimate optical disc.
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