System and method for preventing an illegal copy of contents

Details System and method for preventing an illegal copy of contents System and method for preventing an illegal copy of contents

2006-08-22

2006-08-22

Zand, Kambiz (Department: 2132)

Cryptography

Video cryptography

Copy protection or prevention

C713S165000, C713S167000, C713S193000, C380S228000

Reexamination Certificate

active

07095853

ABSTRACT:
The method of preventing illegal copy of contents encrypts a header using a key generated from the previous sector, performs variable-length coding to the encrypted header to shorten its length, and stores the decoded header into the recording medium as well as contents data, in encryption phase. The method, in decryption phase, reproduces the contents data which have different length for each sector by decoding and encoding the header.

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Japanese Office Action dated Aug. 27, 2003 (w/ English translation of relevant portion).

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