Content playback device

Details Content playback device Content playback device

2011-04-26

2011-04-26

Chai, Longbit (Department: 2431)

Cryptography

Video cryptography

Copy protection or prevention

C380S202000, C380S203000, C726S027000, C726S028000, C726S029000, C726S030000, C713S189000, C713S190000, C713S191000, C713S192000, C713S193000

Reexamination Certificate

active

07933409

ABSTRACT:
To provide a content playback device capable of protecting content according to DRM, when decrypting encrypted content recorded on a recording medium and playing the decrypted content. If key generation information is “00”, a key control unit104concatenates a decrypted media key and content information in this order, and applies a one-way function to the concatenation result to generate a content key. If the key generation information is “10”, the key control unit104sets a rights key as the content key. If the key generation information is “01”, the key control unit104concatenates the decrypted media key and the rights key in this order, and applies a one-way function to the concatenation result to generate the content key.

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