Abstract
Whereas the maximal amount of information that a certain algorithm
can ``hide\" (while keeping the data within allowable distortion bounds)
is certainly related to the ability to assert ownership in court,
it is not directly measuring its ``power of persuasion\",
in part also because it doesn\'t consider directly the existence and
power of watermarking attacks.
In this paper we show why,
due to its particularities, watermarking requires a different metric,
more closely related to its ultimate purpose, claiming ownership in
a court of law. We define one suitable metric ({\\em watermarking power}) and
show how it relates to
derivates of hiding capacity. We prove that there are cases where
considering hiding capacity is sub-optimal as a metric in evaluating
watermarking methods whereas the metric of {\\em watermarking power}
delivers good results.
