Distributed execution software license server
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 29, 2002
Grant Date -
Aug 2, 2001
app pub date -
Dec 15, 1998
filing date -
Dec 15, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of protecting an executable image from unlicensed use is provided by remote execution of sequences of microprocessor instructions. Means of selecting sequences of instructions that execute infrequently and provide a high level of security against reverse engineering is provided. Selection means includes run-time profiling of an executable running under normal conditions. The selected sequences of instructions are replaced with instructions that interrupt the normal flow of execution and transfer control to a license server. A client computer executes the modified executable until the replaced sequences interrupt the normal flow of execution and transfer control to a license server. The license server executes the instructions which were replaced in the modified executable upon proper authorization by emulating the client microprocessor.
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