1. An image processing device comprising: an acceptance section that accepts image data to be processed; an information acquisition section that acquires first information relevant to a first copy-restriction image that is detectable by a first copying device and not relevant to a second copying device or used by the second copying device for copy restriction, and second information relevant to a second copy-restriction image that is detectable by the second copying device and not relevant to the first copying device or used by the first copying device for copy restriction, the first copying device preventing copying of a target image when the first copying device detects the first copy-restriction image embedded in the target image, and the second copying device preventing copying of the target image when the second copying device detects the second copy-restriction image embedded in the target image; a generating section that generates an output image by embedding, in the image data, the first copy-restriction image corresponding to the first information acquired by the information acquisition section and the second copy-restriction image corresponding to the second information acquired by the information acquisition section; and an output section that outputs the output image generated by the generating section.