Computer systems to inhibit unauthorized copying, unauthorized usage, and automated cracking of protected software
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 10, 1985
Grant Date -
N/A
app pub date -
Sep 20, 1982
filing date -
Sep 20, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus are provided for inhibiting unauthorized copying, unauthorized usage and automated cracking of proprietary software used in computer systems. The computer systems execute protected programs, which are protected by encapsulation and/or encryption. To provide security against unauthorized copying of software, means are provided that detect and inhibit automated cracking of protected programs. These means will destroy or make inaccessible information in the CPU during conditions when automated cracking could occur. These means will also store interrupt contexts in secret to prevent implementation of automated cracking. Additional features may be provided to allow operation as a general purpose computer system, where protected programs are distributed using public key cryptography and a means is provided to convert from this distribution form to the protected execution form.
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