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Descrambling of multiple television channels

  • US 8,959,544 B2
  • Filed: 02/01/2013
  • Issued: 02/17/2015
  • Est. Priority Date: 03/15/2012
  • Status: Active Grant
First Claim
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1. A television receiver, comprising:

  • one or more processors; and

    a memory communicatively coupled with and readable by the one or more processors and having stored therein processor-readable instructions which, when executed by the one or more processors, cause the one or more processors to;

    receive a first plurality of television channels as scrambled data packets;

    access a network information table stored locally, wherein;

    the network information table comprises an entry for each television channel of a second plurality of television channels;

    each entry for each television channel of the second plurality of television channels indicates at least;

    a first packet identifier for video packets corresponding to the television channel,a second packet identifier for audio packets corresponding to the television channel, anda third packet identifier for entitlement control message packets corresponding to the television channel; and

    the second plurality of television channels comprises the first plurality of television channels;

    receive a first entitlement control message;

    decrypt the first entitlement control message to obtain a first control word and a second control word;

    receive a second entitlement control message;

    determine the second entitlement control message matches the first entitlement control message;

    based on determining the second entitlement control message matches the first entitlement control message, ignoring the second entitlement control message such that decryption of the second entitlement control message does not occur;

    descramble the scrambled data packets corresponding to the first plurality of television channels using the first control word and the second control word decrypted from the first entitlement control message; and

    store and/or output for presentation video and audio of each television channel of the first plurality of television channels.

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