US 2012/0060223 A1 · TRAITOR TRACING IN A CONTENT PROTECTION SYSTEM

Abstract

A method for detecting at least one traitor computer system among a plurality of receiver computer systems including: assigning a version of protected content to each of the plurality of receiver computer systems that are currently identified as innocent by a content protection system that monitors distribution of protected content to the plurality of receiver computer systems; recovering at least one unauthorized rebroadcast of the content; generating a score for each of the plurality of receiver computer systems with respect to the recovered unauthorized rebroadcast; calculating a threshold independent of an estimation of maximum traitor computer systems; checking a highest score against the threshold; incriminating a receiver computer system having the highest score above the threshold as a traitor computer system; and removing any unauthorized rebroadcasts overlapping with the traitor computer system. The process may be repeated from generating scores until all traitors are identified.

Claims20

Dependent claims

A computer program product, comprising:

a computer readable storage medium to store a computer readable program, wherein the computer readable program, when executed on a computer, causes the computer to perform operations for detecting at least one traitor computer system among a plurality of receiver computer systems subject to a content protection system that monitors distribution of protected content to the plurality of receiver computer systems, the operations comprising:
assigning a version of the content to each of the plurality of receiver computer systems that are currently identified as innocent;
recovering at least one unauthorized rebroadcast of the content;
generating a score for each of the plurality of receiver computer systems with respect to the recovered unauthorized rebroadcast;
calculating a threshold independent of an estimation of maximum traitor computer systems;
checking a highest score against the threshold;
incriminating a receiver computer system having the highest score above the threshold as a traitor computer system;
and
removing any unauthorized rebroadcasts overlapping with the traitor computer system.

6 more elements

A system for detecting a traitor computer system in a content distribution system, comprising:

a content protection system at least partially implemented on a computer device, the computer device comprising a storage device, a processor, and memory, the content protection system also comprising:
an assignment subsystem configured to assign a version of protected content to each of a plurality of receiver computer systems currently identified as innocent;
a recovery subsystem configured to recover at least one unauthorized rebroadcast of the content;
and
an evaluator subsystem configured to:
generate a score for each of the plurality of receiver computer systems with respect to the recovered pirated rebroadcast;
and
calculating a threshold independent of an estimation of maximum traitor computer systems;
checking a highest score against the threshold;
incriminating a receiver computer system having the highest score above the threshold as a traitor computer system;
and
removing any unauthorized rebroadcasts overlapping with the traitor computer system.

9 more elements

Dependencies are inferred from the claim text.

Traitor tracing in a content protection system

Life of this patent

Traitor tracing in a content protection system

Life of this patent

Abstract

Claims20