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\begin{abstract}
Software retains most of the know-how required fot its development. Because nowadays software can be easily cloned and spread worldwide, the risk of intellectual property infringement on a global scale is high. One of the most viable solutions to this problem is to endow software with a watermark. Good watermarks are required not only to state unambiguously the owner of software, but also to be resilient and pervasive. In this thesis we base resiliency and pervasiveness on trace semantics. We point out loops as pervasive programming constructs and we introduce loop transformations as the basic block of pervasive watermarking schemes. We survey several loop transformations, outlining their underlying principles. Then we exploit these principles to build some pervasive watermarking techniques. Resiliency still remains a big and challenging open issue.
\end{abstract}


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