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Sat Jul 6 06:45:03 PDT 1996
MicroPatent, 4 July 96
Systems and methods for protecting software from
unlicensed copying and use (Assignee -- Convex Computer
Corporation)
Abstract: Disclosed systems and methods for protecting a
software program from unauthorized use and copying
through the removal at least one of a plurality of
instructions comprising a software program, and
encrypting the removed instruction utilizing an
encryption algorithm to produce an encrypted instruction,
the encryption algorithm responsive to a randomly
generated key.
Ex Claim Text: A processing system for protecting a
software program from unauthorized use, said software
program including one or more unencrypted instructions
stored in memory associated with said software program,
said processing system comprising: a processing unit
operable to: remove at least one selected said
unencrypted instruction from an executable area in said
memory associated with executable portions of said
program; encrypt said at least one selected unencrypted
instruction removed from said software program utilizing
an encryption algorithm to produce an encrypted
instruction; store said encrypted instruction within a
first non-executable data area in said memory associated
with said software program; and insert at least one
trappable instruction in place of said encrypted
instruction within said executable area in memory
allowing said software program to be linked with one or
more other programs.
Assignee: Convex Computer Corporation
Patent Number: 5530752
Issue Date: 1996 06 25
Inventor(s): Rubin, Robert J.
If you would like to purchase a copy of this patent,
please call MicroPatent at 800-984-9800.
Copyright 1996, MicroPatent
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