05555304 is referenced by 60 patents and cites 16 patents.

A storage medium stores encrypted electronic data, a medium personal number which is unique for each storage medium and encrypted permission information. At least the medium personal number is written onto the storage medium in an un-rewritable form which a user computer cannot rewrite.

Title
Storage medium for preventing an illegal use by a third party
Application Number
31339
Publication Number
5555304
Application Date
November 18, 1994
Publication Date
September 10, 1996
Inventor
Makoto Yoshioka
Kawasaki
JP
Ryota Akiyama
Kawasaki
JP
Takayuki Hasebe
Kawasaki
JP
Agent
Nikaido Marmelstein Murray & Oram
Assignee
Fujitsu
JP
IPC
G06F 12/14
H04L 9/32
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