Method and apparatus for copy protection for various recording m

Details Method and apparatus for copy protection for various recording m Method and apparatus for copy protection for various recording m

1994-06-29

1996-04-30

Barron, Jr., Gilberto

Cryptography

Cryptanalysis

380 5, 380 22, 369 4433, G11B 2328, H04L 930

Patent

active

055132600

ABSTRACT:
A method and apparatus for copyright protection for various recording media such as compact discs (CDs) uses a combination of symmetrical and asymmetrical data encryption to permit the player to handle either copy-protected or non-copy-protected media, in a manner that is extremely difficult to compromise. Coupled with the combination of encrypting methods, an Authenticating Signature is recorded on the media only when copy-protection is required. The nature of this Authenticating Signature is such that it will not be transferred to illicit copies made on CD recorders. When either an original protected or an original non-protected disk is played, the presence or absence of the Authenticating Signature causes the player to correctly decrypt the program data. All original CDs therefore play normally. When a copy of a non-protected CD is played, the absence of the Authenticating Signature also causes the player to correctly decrypt the program data. However, when a copy of a protected CD is played, the absence of the Authenticating Signature causes the player to generate false data which prohibits the disk from playing normally.

REFERENCES:
patent: 4670857 (1987-06-01), Rackman
patent: 4785361 (1988-11-01), Brotby
patent: 4866769 (1989-09-01), Karp
patent: 4891504 (1990-01-01), Gupta
patent: 5159633 (1992-10-01), Nakamura
patent: 5379433 (1995-01-01), Yamagishi
patent: 5412718 (1995-05-01), Narasimhalu et al.
patent: 5418852 (1995-05-01), Itami et al.

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