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Method for detection of a hacked decoder

  • US 8,824,685 B2
  • Filed: 08/21/2008
  • Issued: 09/02/2014
  • Est. Priority Date: 10/15/2007
  • Status: Active Grant
First Claim
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1. A method of identifying a receiver device from which pirated video decryption keys have been obtained, comprising:

  • splitting a population of receiver devices into a compromised population and a non-compromised population N groups;

    detecting a pirated video decryption key in one or more of the N groups;

    aggregating the groups comprising those groups in which a pirated video decryption key was not detected into a non-compromised population group;

    isolating the non-compromised population group;

    organizing the compromised population of receiver devices into a plurality of N new groups, where one of the N new groups is the non-compromised population group and the remainder of the N new groups is the group or groups containing the pirated video decryption key divided into subgroups;

    associating the N new groups with a plurality of N decryption keys, where each of the N new groups is associated with one of a plurality of N decryption keys;

    causing the plurality of N decryption keys to be obtained by their associated N new groups of receiver devices by direct delivery or by derivation at the receiver devices; and

    encrypting one or more entitlement control messages (ECMs) using one of a plurality of N periodic keys so as to produce N sequences of content keys respectively associated with the N new groups in order to segregate the receiver devices by virtue of their use of multiple decryption keys to decrypt content.

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