Method and apparatus for recording and reproducing...

Details Method and apparatus for recording and reproducing... Method and apparatus for recording and reproducing...

2005-04-26

2005-04-26

Barrón, Gilberto (Department: 2132)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

By stored data protection

C380S277000

Reexamination Certificate

active

06886097

ABSTRACT:
A scrambling key information piece is periodically changed among a plurality of different key information pieces including first and second key information pieces. An input signal is scrambled into a scrambling-resultant signal in response to the periodically changed scrambling key information piece. The scrambling-resultant signal, the first key information piece, and the second key information piece are recorded on the recording medium. The first key information piece which is used in the scrambling of a portion of the input signal recorded during a first recording interval is recorded on the recording medium during a second recording interval being longer than the first recording interval and containing the first recording interval.

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Kimura Takeshi, JP 08163119 A, “Scramble or Descramble Method and Scramble or Descramble Device for Packet Signal”, Jun. 21, 1996.*
Nakamura Shinichi, EP 0939552 A2, “Scrambler, Descrambler and Recording Medium”, Feb. 23, 1999.

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