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Progressive video refresh slice detection

  • US 20030156718A1
  • Filed: 11/25/2002
  • Published: 08/21/2003
  • Est. Priority Date: 01/02/2002
  • Status: Active Grant
First Claim
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1. A method of partially dual encrypting a digital video signal, comprising:

  • examining unencrypted packets of data in the digital video signal to identify at least one specified packet type, the at least one specified packet type comprising packets in a set of N consecutive slices in a frame wherein the a second byte after a slice start code is identical in all N consecutive slices;

    encrypting packets identified as being of the specified packet type using a first encryption method to produce first encrypted packets;

    encrypting the packets identified as being of the specified packet type using a second encryption method to produce second encrypted packets; and

    replacing the unencrypted packets of the specified packet type with the first encrypted packets and the second encrypted packets in the digital video signal to produce a partially dual encrypted video signal.

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