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The informal goal of a watermarking scheme is to "mark" a digital object, such as a picture or video, in such a way that it is difficult for an adversary to remove the mark without destroying the content of the object. Although there has been considerable work proposing and breaking watermarking schemes, there has been little attention given to the formal security goals of such a scheme. In this work, we provide a new complexity-theoretic definition of security for watermarking schemes. We describe some shortcomings of previous attempts at defining watermarking security, and show that security under our definition also implies security under previous definitions. We also propose two weaker security conditions that seem to capture the security goals of practice-oriented work on watermarking and show how schemes satisfying these weaker goals can be strengthened to satisfy our definition.

From Weak to Strong Watermarking