05287408 is referenced by 144 patents and cites 1 patents.

An apparatus and method of disabling an unauthorized copy of a computer program. A set of numbers having an uncommon mathematical property is defined. For authorized copies, one of these numbers is written to a pre-determined location in the computer program. Whenever a copy of the computer program is attempted to be run, the computer system is instructed by the computer program to check the number at that pre-determined location. A determination is then made as to whether that number has the uncommon mathematical property. The computer program is disabled if its number at that location does not have the uncommon mathematical property.

Title
Apparatus and method for serializing and validating copies of computer software
Application Number
7/938278
Publication Number
5287408
Application Date
August 31, 1992
Publication Date
February 15, 1994
Inventor
Peter R Samson
San Francisco
CA, US
Agent
Blakely Sokoloff Taylor & Zafman
Assignee
Autodesk
CA, US
IPC
H04L 9/00
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