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Conditional access overlay partial encryption using MPEG transport continuity counter

  • US 20050152548A1
  • Filed: 01/14/2004
  • Published: 07/14/2005
  • Est. Priority Date: 01/14/2004
  • Status: Active Grant
First Claim
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1. A partially encrypted signal comprising:

  • a plurality of encrypted packets, a portion of said encrypted packets encrypted according to a first encryption scheme to define first encrypted packets and another portion of said encrypted packets encrypted according to a second encryption scheme to define second encrypted packets; and

    a plurality of unencrypted packets, wherein at least a portion of said unencrypted packets, at least one of said first encrypted packets, and at least one of said second encrypted packets are indistinguishable from one another based upon a packet identifier, and wherein said at least one each of said first and second encrypted packets being indistinguishable from one another based upon said packet identifier are also indistinguishable based upon a continuity count.

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