| http://www.w3.org/ns/prov#value | - As a result, even if it is not clear which electronic watermark superimposing method was employed to embed an electronic watermark in a given set of image data when handling a plurality of kinds of image data in the image data storage apparatus 1, the image data storage apparatus 1 automatically identifies the electronic watermark superimposing method to enable the verification of the electronic w
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