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Stephen M Matyas, Jonathan Oseas: Code protection using cryptography. International Business Machines Corporation, John E Hoel, Joseph C Clark George E Redmond Jr, July 12, 1988: US04757534 (248 worldwide citation)

A cryptographic method for discouraging the copying and sharing of purchased software programs allows an encrypted program to be run on only a designated computer or, alternatively, to be run on any computer but only by the user possessing a designated smart card. Each program offering sold by the s ...


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Oseas Jonathan, Matyas Stephen M: Methode de protection par codes cryptographiques, Code protection using cryptography. International Business Machines Corporation, SAUNDERS RAYMOND H, June 21, 1988: CA1238427

ABSTRACT A cryptographic method for discouraging the copying andsharing of purchased software programs allows an encryptedprogram to be run on only a designated computer or,alternatively, to be run on any computer but only by theuser possessing a designated smart card. Each programoffering sold by t ...