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US 7,406,176 B2Granted
Fully scalable encryption for scalable multimedia
AssigneeMicrosoft Corporation
InventorsBin Zhu, Shipeng Li, Chun Yuan, Yidong Wang
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Abstract
Subject matter includes exemplary systems and related methods for fully scalable encryption of scalable multimedia. A scalable bitstream encrypted using the subject matter maintains full functionality of scalable features in the encrypted form. The exemplary scalable encryption allows transcoding, rate shaping, and other operations directly on the ciphertext without degradation of scalable compression efficiency and error resiliency.
Claims41
A method, comprising:
- receiving scalable multimedia content having a base layer and an enhancement layer;
- encrypting content of the base layer using a first scheme;
- encrypting content of the enhancement layer using a second scheme;
- and
- wherein the first scheme includes deriving a base layer key from at least some of the content of the base layer and the second scheme includes encrypting the content of the enhancement layer using the base layer key.
2 more elements
Dependencies are inferred from the claim text.