Systems and methods for secure playback of encrypted elementary bitstreams

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.