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Dynamic composition of pre-encrypted video on demand content

  • US 7,346,163 B2
  • Filed: 03/16/2004
  • Issued: 03/18/2008
  • Est. Priority Date: 10/31/2003
  • Status: Active Grant
First Claim
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1. A method of processing digital video content in a video-on-Demand (VOD) system, wherein the digital video content comprises unencrypted intra-coded frames and inter-coded frames, the method comprising:

  • duplicating the unencrypted intra-coded frames;

    selecting a plurality of the unencrypted intra-coded frames for encryption to produce selected frames;

    encrypting the selected frames under a first encryption algorithm to produce first encrypted frames;

    encrypting the duplicates of the unencrypted selected frames under a second encryption algorithm to produce second encrypted frames;

    storing the inter-coded frames in a first file;

    storing the intra-coded frames, whether encrypted under the first encryption algorithm or unencrypted, in a second file; and

    storing the duplicate intra-coded frames, whether encrypted under the second encryption algorithm or unencrypted, in a third file;

    sending normal play content to a receiver compatible with the first encryption algorithm by multiplexing content from the first file with content from the second file,sending trick play content to a receiver compatible with the first encryption algorithm by retrieving content only from the second file;

    sending normal play content to a receiver compatible with the second encryption algorithm by multiplexing content from the first file with content from the third file,sending trick play content to a receiver compatible with the second encryption algorithm by retrieving content only from the third file;

    whereby, separate trick play files and multiple encrypted content files are combined.

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