Compressed data scrambled distribution device and playback...

Details Compressed data scrambled distribution device and playback... Compressed data scrambled distribution device and playback...

2006-03-13

2011-12-06

Zia, Syed A. (Department: 2431)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C713S169000, C713S193000, C380S210000, C380S200000, C380S268000, C382S100000, C382S232000, C382S235000, C725S031000, C725S025000

Reexamination Certificate

active

08074074

ABSTRACT:
The present invention provides a scrambled compressed data distribution device that can perform a high-resistance scrambled compressed data distribution by selectively using a plurality of types of scramble information and a playback device thereof.A scrambling section scrambles compressed data by unique one of a plurality of scrambling methods. A hash value calculating section determines a hash value based on data b in a position where digital watermark data is not embedded, and an encrypting section encrypts the hash value with a secret key Sk(n) corresponding to the scrambling method and outputs an encrypted hash value c. A watermark data embedding section embeds the encrypted hash value in a watermark data embedding position of the data b and transmits the same as a compressed data stream d.

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