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Systems and methods for playing back alternative streams of protected content protected using common cryptographic information

  • US 9,247,311 B2
  • Filed: 12/08/2014
  • Issued: 01/26/2016
  • Est. Priority Date: 09/01/2011
  • Status: Active Grant
First Claim
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1. A source encoder, comprising:

  • a processor;

    a non-volatile storage containing an encoding application;

    wherein the encoding application directs the processor to;

    receive a stream of video;

    encode the stream of video as a plurality of alternative streams according to encoding parameters associated with each of the alternative streams, where each of the alternative streams comprises a plurality of encoded video frames;

    obtain a common set of frame keys;

    encrypt portions of several encoded video frames from each alternative stream using keys from the same common set of frame keys;

    after encrypting the portions of encoded video frames, (1) write the encoded video frames of each alternative stream to a separate container file from a plurality of container files and (2) write DRM information to each separate container file that identifies the encrypted portions of several encoded video frames written to the separate container file;

    store a copy of the common set of frame keys in each container file; and

    upload the container files to a content distribution server for distribution to playback devices using adaptive bitrate streaming.

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