Systems and methods for secure playback of encrypted elementary bitstreams

  • US 10,484,749 B2
  • Filed: 09/19/2018
  • Issued: 11/19/2019
  • Est. Priority Date: 12/04/2009
  • Status: Active Grant
First Claim
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1. A playback device for playing back encrypted video, the playback device comprising:

  • a set of one or more processors; and

    a non-volatile storage containing a playback application for causing the set of one or more processors to perform the steps of;

    receiving a container file with video data at a parser;

    extracting portions of the container file using the parser, wherein the container file comprises video data with a partially encrypted frame, cryptographic information, and a block reference that identifies a portion of the partially encrypted frame, and wherein the partially encrypted frame contains encrypted portions and unencrypted portions of data;

    providing the partially encrypted frame, the cryptographic information, and the block reference from a demultiplexer to a video decoder;

    deciphering, at the video decoder, a frame key by which the portion of the partially encrypted frame is encrypted using the cryptographic information and a key table stored on the video decoder;

    identifying the encrypted portion of the partially encrypted frame using the block reference;

    decrypting the encrypted portion of the partially encrypted frame using the frame key and the video decoder; and

    decoding the decrypted portion of the frame for rendering on a display device using the video decoder.

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