Token passing technique for media playback devices

Details Token passing technique for media playback devices Token passing technique for media playback devices

2011-07-05

2011-07-05

Zand, Kambiz (Department: 2434)

Information security

Prevention of unauthorized use of data including prevention...

Access control

C726S002000, C713S189000, C380S203000, C380S277000

Reexamination Certificate

active

07975312

ABSTRACT:
A digital rights management (DRM) system for distribution of digital content such as audio or video uses a token passing scheme to enhance security of the content from unauthorized access and use, including access by unauthorized players. The token is requested from the central content or DRM server by a host device such as a user's computer, using security related information. The token is then passed to a media player associated with the host device, the token being encrypted using a key special to that particular player. Upon receipt of the token, the player transmits back to the server certain related security information confirming receipt of the token and in return receives keys for decryption of the associated digital content. In the absence of proper passing of the token, player access to the content, or further access to other content, is denied. This also allows the player to communicate directly with the server for obtaining the keys.

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