SCREENING ARCHITECTURES ENABLING REVOCATION AND UPDATE

摘要

Methods, devices, systems and computer program products are provided to facilitate signaling of digital rights management (DRM) information that is carried within a multimedia content as digital watermarks. The embedded watermarks enable signaling of a change in trustworthiness of particular DRM technology, enable addition of new DRM technologies to a trusted list of technologies, and facilitate revocation of obsolete or untrustworthy technologies. Once a content is received at a receiver that is equipped with a watermark extractor, extraction of watermark symbols from the content allows the determination of change in trustworthiness of DRM technologies associated with the content.

主权项

1. A method for determination of digital rights management (DRM) status associated with a multimedia content, comprising:
receiving a content; extracting a plurality of symbols of one or more watermark messages embedded in the content using a watermark extractor that is implemented at least partially in electronic circuitry, the plurality of symbols designated for carrying DRM-related information as part of a payload of the one or more watermark messages that enables a determination that:
(a) a particular DRM technology has a credentialed status and is deemed to be trustworthy;(b) a credentialed status of a particular DRM technology has been revoked; or(c) a particular DRM technology has a restricted status and is deemed not be trustworthy; and determining trustworthiness status of at least one DRM technology associated with the content based on the plurality of symbols that are extracted from the content.