An image processing apparatus records an input image signal into another recording medium or displays the input image signal on a display device. When a digital image signal having superimposed thereupon an electronic watermark is input, an identification circuit identifies the method employed to superimpose the electronic watermark. A decode circuit decodes the electronic watermark by employing the electronic watermark superimposing method identified by the identification circuit.

 
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> System and method for authentication of JPEG image data

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