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Traitor Tracing Jan-Jaap Oosterwijk Eindhoven University of Technology (TU/e) Department of Mathematics
©2012 Irdeto, All Rights Reserved. About myself BSc & MSc in Mathematical Sciences at Utrecht University, NL Internship (July – December 2012) at Irdeto Research Eindhoven, NL PhD ( ) in Collusion-Resistant Traitor Tracing at Eindhoven University of Technology, NL 2
©2012 Irdeto, All Rights Reserved. Copyright Protection Don’t try to prevent, but trace, accuse and deter. Prevention is impossible. Trace who distributed an illegal copy. Accuse such traitors to deter others. How? Mark and hide Insert a unique code in each official copy of the digital document. Place it in the same locations for all users, for easy retrieval Make it imperceptible (watermark) to prevent the user from changing or removing it. 3
©2012 Irdeto, All Rights Reserved. Colluding traitors What’s imperceptible to one, might be visible for many. Users can compare their copies bit by bit. Where a bit differs, part of the watermark is located. To prevent the traitors to locate the entire watermark, it should be made such that for each (small) group of users bits should often coincide. Codelength Add a little, gain a lot The larger the coalition of traitors, the longer the code needs to be to trace them. Content should be protected by adding as small a fingerprint as possible 4
©2012 Irdeto, All Rights Reserved. Accusation errors Two types: Falsely accuse an innocent user Not accuse any guilty user Allow some mistakes, but aim for perfection Accusing an innocent user should be an extremely rare event Sometimes not accusing any guilty user isn’t so bad: repeated offenders will be caught in the long run Allows for much shorter codelength 5
©2012 Irdeto, All Rights Reserved. Research focus 6 Dynamic Static Watermark insertion Traitor attack Generic Specific known
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