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A PARTIAL DUAL ENCRYPTED STREAM UTILIZING PROGRAM MAP TABLES

  • US 20060233369A1
  • Filed: 12/06/2005
  • Published: 10/19/2006
  • Est. Priority Date: 04/03/1995
  • Status: Active Grant
First Claim
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1. A method for encoding and encyrpting a program in at least two distinct partial-encrypted streams, a plurality of set-tops for decrypting one of the at least two distinct partial-encrypted streams, the method comprising the steps of:

  • encoding a program association table to include at least two program numbers in accordance with at least one program, and for associating a program map table with an identifier for each of the at least two program numbers;

    encoding a first program map table corresponding to a program, the first program map table including first audio and video identifiers in accordance with a first encryption scheme; and

    encoding a second program map table corresponding to the program, the second program map table including the first audio and video identifiers in accordance with the first encryption scheme and second audio and video identifiers in accordance with a second encryption scheme.

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