Information recording/reproducing device

Details Information recording/reproducing device Information recording/reproducing device

2007-07-03

2007-07-03

Moazzami, Nasser (Department: 2136)

Cryptography

Video cryptography

Copy protection or prevention

C380S203000, C380S221000, C380S239000, C713S165000, C713S193000, C726S026000, C726S030000, C726S032000, C726S033000

Reexamination Certificate

active

09807703

ABSTRACT:
Contents data that have been enciphered and transmitted are recorded as they are on a recording medium, and the contents key used to encipher these data is enciphered in a way used in this recording system and is recorded on the medium. Moreover, a step is taken to ensure that fine trick plays can be performed. In recording contents data that have been enciphered and transmitted, the contents data themselves are recorded in the enciphered state on the recording medium. However, the contents data are decoded by a contents data decoding circuit46, and a map file containing necessary management information for reproduction is created by a map file creating circuit47and this file is recorded together with the contents data.

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Lenzi, R., ‘The Interactive-Music Network WG-DCM Systems for multimedia content distribution Technology Survey’, Rigel Engineering, Jul. 2, 2003, entire document, www.interactivemusicnetwork.org/document/view—document.php?file—id=361.
U.S. Appl. No. 09/529,192, Motoki Kato.

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