| http://www.w3.org/ns/prov#value | - For the authors, the purpose is to protect copyright over the content of the information and so the watermark must have robustness with respect to editing by various types of users, while for the users, it must be possible to use the content of the information while being unaware of the watermark and so it must not be possible to sense any deterioration of images that have undergone watermark proc
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