Computer systems to inhibit unauthorized copying, unauthorized usage, and automated cracking of protected software
December 10, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesBlock cipher system for data security Operating system authenticator Location dependence for assuring the security of system-control operations Computer software security system Microprocessor for executing enciphered programs Protection of data processing system against unauthorized programs Cryptographic verification of operational keys used in communication networks Cryptographic apparatus and method Cryptographic file security for single domain networks Method and apparatus for controlling usage of a programmable computing machine InventorsApplicationNo. 06/420562 filed on 09/20/1982US Classes:713/190, Computer instruction/address encryption380/29, NBS/DES algorithm705/51Usage protection of distributed data filesExaminersPrimary: Cangialosi, SalvatoreAssistant: Steinberger, Brian S. International ClassesG06F 1/00 (20060101)G06F 21/00 (20060101) AbstractA 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.Other References
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