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.