Content playback system, content playback method, content...

Details Content playback system, content playback method, content... Content playback system, content playback method, content...

2007-07-31

2007-07-31

Moazzami, Nasser (Department: 2136)

Cryptography

Communication system using cryptography

C713S169000

Reexamination Certificate

active

09790046

ABSTRACT:
A content playback system for sharing content possessed by many users who each hold a token of encrypted content, the content playback system including a playback requesting apparatus which holds a token and which requests the playback of the encrypted content, and a temporary playback apparatus for performing the playback of the encrypted content in response to a playback request of the content. The temporary playback apparatus transmits a token sending request in a form in which an identifier of the content and a digital signature are attached. The playback requesting apparatus returns the token to the temporary playback apparatus only when an authentication procedure for the digital signature is successful.

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MP3car.com Hardware, Wayback Machine, retreived on Jun. 20, 2005, Published date Dec. 2, 1998, http://web.archive.org/web/19981202113022/www.mp3car.com/tethered.html.
Menezes, A. J., Van Oorschot, P.C., Vanstone, S. A., Handbook of Applied Cryptography, 1997, pp. 300-308 and 440-453, CRC Press.

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