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Partial dual-encrypted stream utilizing program map tables

  • US 20040136532A1
  • Filed: 11/21/2003
  • Published: 07/15/2004
  • Est. Priority Date: 04/03/1995
  • Status: Abandoned Application
First Claim
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1. A method for receiving a program in a dual-encrypted stream by a plurality of set-tops, the plurality of set-tops for decrypting one of a first encryption stream and a second encryption stream, the method comprising the step of:

  • transmitting a program association table including a plurality of programs, wherein each program has two program numbers, wherein a first program number is associated with a first program map table for the first encryption stream and a second program number is associated with a second program map table for the second encryption stream, wherein the plurality of set-tops retrieve packets associated with a desired program via one of the first program map table and the second program map table.

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