An information processing device allows for user recognition of the difference between a print product (original) and a copy product of the print product. The information processing device includes a receiving unit which receives a character string which is concealed on a print product and appears on a copy product of the print product; a generating unit which generates printing data in which dots are concentrated into masses in a first area and dots are distributed in a second area and in which either of the first area and the second area is based on the received character string, such that the print product is produced by an image forming device; and a display controlling unit which controls display of first image data and second image data, wherein the second image data is different from the first image data, and the received character string appears in the second image data.