Software protection method and apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 3, 1986
Grant Date -
N/A
app pub date -
Oct 26, 1981
filing date -
Oct 26, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a method of and apparatus for limiting program execution to only an authorized data processing system, a proprietary program, together with first and second authorization codes, is stored on a magnetic disc or other storage medium. The first and second authorization codes are read. A hardware module containing a pseudorandom number generator unique to the authorized system receives the first authorization code as a key. The resultant number generated by the number generator, which is a function of the key and particular pseudorandom generator algorithm, is compared with the second authorization code in direct or encrypted form. An execution enable signal is generated in response to a positive comparison to enable the stored program to be executed.
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