05058162 is referenced by 166 patents and cites 3 patents.

A method of distributing a plurality of data files to a plurality of recipients including the steps of: placing encrypted copies of the data files to be distributed on a plurality of identical media and providing the recipients with media reading devices having data file decryption capability; logically arranging the data files into data file groups; in response to a recipient's request for access to selected file groups providing the recipient with a group access map indicative of the file groups to which access is requested; in further response to a recipient's request for access to selected file groups providing the recipient with a password to be used for access verification; completing an access verification operation using the group access map and the password and data indicative of the media being read and data indicative of the reading device being used; providing access to the data files in the file groups to which access is requested by use of the group access map; and decrypting the accessed data files.

Title
Method of distributing computer data files
Application Number
7/564911
Publication Number
5058162
Application Date
August 9, 1990
Publication Date
October 15, 1991
Inventor
Steven J Hand
San Jose
CA, US
Pankaj B Shah
Santa Clara
CA, US
Christen M Armbrust
Boulder Creek
CA, US
Kenneth R Nielsen
Loveland
CO, US
John C Santon
Johnstown
CO, US
Assignee
Hewlett Packard Company
CA, US
IPC
H04L 9/00
H04K 9/00
H04K 1/00
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