Unauthorized use preventing method for optical disks, optical di

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

1996-10-11

1999-11-09

Barron, Jr., Gilberto

Cryptography

Cryptanalysis

369 47, 380 5, H04L 900, G11B 7013

Patent

active

059828862

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), Guglielmino
patent: 4785361 (1988-11-01), Brotby
patent: 4879704 (1989-11-01), Takagi
patent: 4891504 (1990-01-01), Gupta
patent: 5065429 (1991-11-01), Lang
patent: 5132954 (1992-07-01), Kulakowski et al.
Japanese Patent Office Action mailed Feb. 6, 1996, in connection with Japanese Patent Application No. 062608.
Japanese Patent Office Action mailed Feb. 6, 1996, in connection with Japanese Patent Application No. 062609.
Japanese Patent Office Action mailed Feb. 6, 1996, in connection with Japanese Patent Application No. 061882.

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