Systems and methods for protecting software from unlicensed copy

Details Systems and methods for protecting software from unlicensed copy Systems and methods for protecting software from unlicensed copy

1994-02-22

1996-06-25

Cain, David C.

Cryptography

Cryptanalysis

380 23, 380 25, 380 49, H04L 900

Patent

active

055307523

ABSTRACT:
Disclosed are 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.

REFERENCES:
patent: 4168396 (1979-09-01), Best
patent: 4525599 (1985-06-01), Curran et al.
patent: 4791565 (1988-12-01), Dunham et al.
patent: 4888798 (1989-12-01), Earnest
patent: 4930073 (1990-05-01), Cina, Jr.
patent: 5319705 (1994-06-01), Halter et al.

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