Copy prevention apparatus and method therefor

Details Copy prevention apparatus and method therefor Copy prevention apparatus and method therefor

1990-04-24

1991-06-25

Wallace, Linda J.

Cryptography

Cryptanalysis

380 3, 380 52, 364184, 340653, 361380, G11B 2328, G05B 902

Patent

active

050273981

ABSTRACT:
In the copy prevention apparatus and its method, it is discriminated whether an object is legally copied or not; a constant event is generated at or below a predetermined probability; and an abnormal operation is executed only if the two conditions of the object having been determined as an illegal copy, and the event having been generated, are satisfied. Therefore, even if the object is determined as an illegal copy, the abnormal operation is not always executed, but executed at or below a predetermined probability. Although the occurrence of the abnormal operation can be indicated to the user immediately, it is also preferable to keep the abnormal operation occurrence secret for a time and inform the user of the occurrence an appropriate time later.

REFERENCES:
patent: 4583011 (1986-04-01), Pechar
patent: 4740890 (1988-04-01), William
patent: 4766516 (1988-08-01), Ozdemir et al.
patent: 4785361 (1988-11-01), Brotby
patent: 4835682 (1989-05-01), Kurachi et al.
patent: 4849836 (1989-07-01), Kachikian
patent: 4866769 (1989-09-01), Karp

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