Unauthorized use prevention method for optical disks, optical di

Details Unauthorized use prevention method for optical disks, optical di Unauthorized use prevention method for optical disks, optical di

1993-03-17

1995-05-23

Barron, Jr., Gilberto

Cryptography

Cryptanalysis

380 5, 360 60, G11B 1505, G11B 1904

Patent

active

054188520

ABSTRACT:
In a method for preventing unauthorized use of a recording medium having a user accessible area and a user inaccessible area, first information is read from the user inaccessible area of the recording medium. The first information is compared with second information concerning a true recording medium (lawfully produced copy). It is then concluded that the recording medium is the true recording medium when the first information corresponds to the second information.

REFERENCES:
patent: 4462078 (1984-07-01), Ross
patent: 4584641 (1986-04-01), Guglielminu
patent: 4785361 (1988-11-01), Brotby
patent: 4879704 (1989-11-01), Takagi et al.
patent: 4891504 (1990-01-01), Gupta
patent: 5065429 (1991-11-01), Lang
German Office Action dated Feb. 16, 1994 (translation).

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