Computer software protection

Details Computer software protection Computer software protection

1991-05-23

1994-02-15

Cain, David

Cryptography

Cryptanalysis

H04L 900

Patent

active

052874079

ABSTRACT:
A master copy of a software file has within it a predetermined block of data. When a copy of the file is made that block of data within the copied file is located and overwritten with data identifying the copied file. When an unauthorized copy is found, the data identifying the copy can be read and the source of the unauthorized copy may be traced. The invention is particularly suited to use with software distribution over a computer network in which details such as the time the copied file was made and the name of the authorized user can be embedded within the copy.

REFERENCES:
patent: 4748562 (1988-05-01), Brown
patent: 4866769 (1989-09-01), Karp
patent: 4903296 (1990-02-01), Chandra et al.
patent: 4979210 (1990-12-01), Nagata et al.
patent: 5027396 (1991-06-01), Platteter et al.
patent: 5027398 (1991-06-01), Miyoshi
IBM Technical Disclosure Bulletin, vol. 28, No. 2 Jul. 1985 "Computer Program Identification".

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