Software protection and identification system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 15, 1989
Grant Date -
N/A
app pub date -
Aug 4, 1986
filing date -
Aug 4, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of protecting machine readable signals recorded on magnetic recording media from unauthorized duplication and use. The signals to be protected are recorded on a first portion of the magnetic recording media. The protected signals on the first portion can be detected and altered by the machine. Second signals are recorded on a second portion of the magnetic recording media. The second signals on the second portion can be detected by the machine but cannot be altered by the machine. An attempt is made by the machine to alter the second signals on the second portion. Then, if the second signals cannot be detected on said second portion, the machine is disabled from further using the signals recorded on the recording media. Apparatus for practicing the method is also disclosed.
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