Computer software protection, by optical effects
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United States of America Patent
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Jun 18, 1991
Grant Date -
N/A
app pub date -
Apr 20, 1990
filing date -
Apr 20, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This apparatus and method protects software from unauthorized distribution and use, by utilizing the fact that holograms and other optical effects-producing media are extremely difficult to copy. A hologram, series of holograms, or other optical media, are used to create an 'optical software key'. When queried by a computer program, the program user, with the help of the optical key, reads a code (or codes). When the appropriate code is input to the program, access (or continued access) is then allowed.
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