05457746 is referenced by 390 patents and cites 19 patents.

The system and method of the present invention provides the support of high density removable media, such as CD-ROM or MO, to be used as a distributed media for storing data where access thereto is securely restricted. Through this system and method, the secure periodic distribution of several different sets of data information to the end user is achieved with access control selectively performed by at the user's site through communication with the billing/access center. User billing is based on the purchase of the decryption access codes as indicated by the access code attributes encoded on the media. Access code availability is further controlled by selectively providing for updates of decryption access codes.

Title
System and method for access control for portable data storage media
Application Number
122005
Publication Number
5457746
Application Date
December 19, 1994
Publication Date
October 10, 1995
Inventor
Janet L Dolphin
Milpitas
CA, US
Agent
Medlen & Carroll
Assignee
Spyrus
CA, US
IPC
H04L 9/00
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