Method and apparatus for encrypting and for decrypting data...

Details Method and apparatus for encrypting and for decrypting data... Method and apparatus for encrypting and for decrypting data...

2005-06-28

2005-06-28

Morse, Gregory (Department: 2134)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

By stored data protection

C713S156000, C713S175000

Reexamination Certificate

active

06912661

ABSTRACT:
A method and apparatus for preventing unauthorized use of DVDs on a DVD ROM drive. The method comprises a DVD disc that includes special data processing. When the DVD is replayed on a standard DVD ROM drive the invention causes the output of the DVD ROM drive to be erroneous, such that the computer cannot use the data. According to the invention, when encoding a disc, the error correction and/or error detection bits, check bytes, are moved into the normal or main data area. When this scrambled data is output from a standard DVD ROM drive, the data in the check byte area is lost and the information is not useable. For authorized use, this scrambling is reversed before sending video and/or audio data to the MPED decoder and AC-3 decoder respectively.

REFERENCES:
patent: 5623459 (1997-04-01), Iwamura et al.
patent: 5675645 (1997-10-01), Schwartz et al.

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