Two-Level Fingerprinting Codes

N. Prasanth Anthapadmanabhan; Alexander Barg

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arXiv · 0905.0417

Two-Level Fingerprinting Codes

N. Prasanth Anthapadmanabhan·Alexander Barg

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Abstract

We introduce the notion of two-level fingerprinting and traceability codes. In this setting, the users are organized in a hierarchical manner by classifying them into various groups; for instance, by dividing the distribution area into several geographic regions, and collecting users from the same region into one group. Two-level fingerprinting and traceability codes have the following property: As in traditional (one-level) codes, when given an illegal copy produced by a coalition of users, the decoder identifies one of the guilty users if the coalition size is less than a certain threshold $t$. Moreover, even when the coalition is of a larger size $s$ $(> t)$, the decoder still provides partial information by tracing one of the groups containing a guilty user. We establish sufficient conditions for a code to possess the two-level traceability property. In addition, we also provide constructions for two-level fingerprinting codes and characterize the corresponding set of achievable rates.

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N. Prasanth Anthapadmanabhan, Alexander Barg. 2009-05-04. Two-Level Fingerprinting Codes. https://arxiv.org/abs/0905.0417

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