Watermarking protocols, in conjunction with digital watermarking technologies, make it possible to trace back digital copyright infringers by identifying who has legitimately purchased digital content and then illegally shared it on the Internet. Although they can act as an effective deterrent against copyright violations, their adoption in the current web context is made difficult due to unresolved usability and performance issues. This paper aims at providing researchers with the basics needed to design watermarking protocols suited to the web context. It is focused on two important aspects. The first concerns the basic requirements that make a protocol usable by both web users and content providers, whereas the second concerns the security primitives and how they have been used to implement the most relevant examples of watermarking protocols documented in the literature. In this way, researchers can rely on a quick guide to getting started in the field of watermarking protocols.
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