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)

Importance

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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)

Patent OwnerAddress
DONALD LYNN DUTY & DONALD THOMAS CLAUDE AS TRUSTEES OF THE CHRONOGUARD TRUST2651 RILLWOOD ROAD BIRMINGHAM AL 35243
CHRONOGUARD L L C2651 RILLWOOD ROAD BIRMINGHAM AL 45243
DONALD LYNN DUTY AS TRUSTEE OF THE DUTY TRUST2651 RILLWOOD ROAD BIRMINGHAM AL 35243
DONALD THOMAS CHRISTOPHER2651 RILLWOOD ROAD BIRMINGHAM AL 35243
DONALD SARAH HOLLIS2651 RILLWOOD ROAD BIRMINGHAM AL 35243

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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