05563946 is referenced by 320 patents and cites 10 patents.

A method and apparatus is provided for transferring encrypted files from a source computer to one or more target computers. An export program is provided in the source computer and an import program is provided in the target computer. The export program decrypts the encrypted file and tags the export operation with an export counter value. The clear text file is then encrypted with an encryption operation utilizing a key which is unique to a transfer memory media, such as diskette serial number. The memory media is carried to a target computer which utilizes the import file to decrypt the encrypted file.

Title
Method and apparatus for enabling trial period use of software products: method and apparatus for passing encrypted files between data processing systems
Application Number
8/238418
Publication Number
5563946
Application Date
April 25, 1994
Publication Date
October 8, 1996
Inventor
Robert F Pryor
Longmont
CO, US
Jagdish Nagda
Boulder
CO, US
Thomas E Cooper
Louisville
CO, US
Agent
Andrew J Dillon
Barry J Bumgardner
Melvin A Hunn
Assignee
International Business Machines Corporation
NY, US
IPC
G06F 15/21
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