Digital rights management system
作者： Javier Montaner , Robert P. c , o Stichting Telematica Instituut Hulsebosch , Bob c , Koen H. J. c
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摘要: The invention facilitates the offline extension of authorizations, which were issued online after a first user authentication. This is achieved using second "extension" authentication procedure. Applications to Digital Rights Management (DRM) with support for domains and person-based access content are described. Once domain key sent from an server public rendering device limited validity time, time may be extended by subsequent authentications without being connected server.
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