Collusion-resistant fingerprinting for multimedia in a broadcast channel environment

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Title: Collusion-resistant fingerprinting for multimedia in a broadcast channel environment
Author: Luh, William
Abstract: Digital fingerprinting is a method by which a copyright owner can uniquely embed a buyer -dependent , inconspicuous serial number (representing the fingerprint ) into every copy of digital data that is legally sold . The buyer of a legal copy is then deterred from distributing further copies , because the unique fingerprint can be used to trace back the origin of the piracy . The major challenge in fingerprinting is collusion , an attack in which a coalition of pirates compare several of their uniquely fingerprinted copies for the purpose of detecting and removing the fingerprints . The objectives of this work are two -fold . First , we investigate the need for robustness against large coalitions of pirates by introducing the concept of a malicious distributor that has been overlooked in prior work . A novel fingerprinting code that has superior codeword length in comparison to existing work under this novel malicious distributor scenario is developed . In addition , ideas presented in the proposed fingerprinting design can easily be applied to existing fingerprinting schemes , making them more robust to collusion attacks . Second , a new framework termed Joint Source Fingerprinting that integrates the processes of watermarking and codebook design is introduced . The need for this new paradigm is motivated by the fact that existing fingerprinting methods result in a perceptually undistorted multimedia after collusion is applied . In contrast , the new paradigm equates the process of collusion amongst a coalition of pirates , to degrading the perceptual characteristics , and hence commercial value of the multimedia in question . Thus by enforcing that the process of collusion diminishes the commercial value of the content , the pirates are deterred from attacking the fingerprints . A fingerprinting algorithm for video as well as an efficient means of broadcasting or distributing fingerprinted video is also presented . Simulation results are provided to verify our theoretical and empirical observations .
URI: http : / /hdl .handle .net /1969 .1 /1478
Date: 2005-02-17

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Collusion-resistant fingerprinting for multimedia in a broadcast channel environment. Available electronically from http : / /hdl .handle .net /1969 .1 /1478 .

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