Implementing a shared higher level of privilege on personal computers for copy protection of software
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United States of America Patent
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Feb 20, 1990
Issued Date -
N/A
app pub date -
Nov 12, 1986
filing date -
Sep 14, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Method and apparatus which restricts software, distributed on magnetic media, to use on a single computing machine. The original medium is functionally uncopyable, until it is modified by the execution of a program stored in a tamper proof co-processor which forms a part of the computing machine. The modified software on the original medium may then be copied, but the copy is operable only on the computing machine containing the co-processor that performed the modification.
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