Interdigital Technology Corporation

Amit Singhal

Yogendra C Shah

Inhyok Cha

Guodong Zhang

Robert L Olesen

Sung-Hyuk Shin

Alexander Reznik

Prabhakar Chitrapu

John Erich Hoffmann

Debashish Purkayastha

John V Thommana

Alan Gerald Carlton

Alain Charles Louis Briancon

Richard Dan Herschaft

Akinlolu Oloruntosi Kumoluyi

Kiran Kumar S Vanganuru

TieJun Shan

The present invention discloses several methods to strengthen the integrity of entities, messages, and processing related to content distribution as defined by the Open Mobile Alliance (OMA) Digital Rights Management (DRM). The methods use techniques related to the Trusted Computing Group (TCG) specifications. A first embodiment uses TCG techniques to verify platform and DRM software integrity or trustworthiness, both with and without modifications to the DRM rights object acquisition protocol (ROAP) and DRM content format specifications. A second embodiment uses TCG techniques to strengthen the integrity of ROAP messages, constituent information, and processing without changing the existing ROAP protocol. A third embodiment uses TCG techniques to strengthen the integrity of the ROAP messages, information, and processing with some changes to the existing ROAP protocol.

Digital rights management using trusted processing techniques

Tokens/keys are produced for wireless communications. These tokens/keys are used for watermarks, signature insertion, encryption and other uses. In one embodiment, contextual information is used to generate tokens/keys. The tokens/keys may be derived directly from the contextual information. The contextual information may be used in conjunction with other information to derive the tokens/keys. Tokens/keys may be exchanged between transmit/receive units. The exchange of these tokens/keys may be encrypted.

Tokens/keys for wireless communications

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King of Prussia, PA, United States of America

Amit Singhal