05625690 is referenced by 238 patents and cites 14 patents.

A pay per use system for of the unauthorized use of computer software. An encryption program encodes original software to produce secured software. The encoding is accomplished by using cryptographic techniques. In order to use the software, a user must call a telephone number to receive the cryptographic keys necessary to decrypt the secured software. Thus, users must pay for each use of the secured software. The system allows software developers to freely distribute the secured software. Copies of the secured software may be freely made, because payment is based on each use of the software not on each copy of the software.

Title
Software pay per use system
Application Number
8/152769
Publication Number
5625690
Application Date
November 15, 1993
Publication Date
April 29, 1997
Inventor
Robert E Reinke
Indianapolis
IN, US
Alan D Michel
Fishers
IN, US
Agent
Donald P Dinella
Jeffrey M Weinick
Assignee
Lucent Technologies
NJ, US
IPC
H04L 9/00
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