Software protection system

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 4471163
SERIAL NO

06308248

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A protection system for controlling the operation of a digital computer as to a particular program wherein a program 'lock' interfaces with the computer and authorizes the operation in response only to a selected relation between a number in the program, a number in the lock, and a third number, a 'key', supplied to the lock and which bears a selected relation to both the program number and lock number.

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First Claim

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Patent Owner(s)

  • CHRONOGUARD, L.L.C.;DONALD, LYNN DUTY & DONALD, THOMAS CLAUDE AS TRUSTEES OF THE CHRONOGUARD TRUST;DONALD, LYNN DUTY, AS TRUSTEE OF THE DUTY TRUST

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Donald, Henry W 428 Lakewood Dr., Homewood, AL 35209 1 300
Donald, Thomas C 2651 Rillwood Rd., Birmingham, AL 35243 1 300

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