1. A computer program product comprising a non-transitory computer-usable medium having computer-readable program codes embodied in the medium, wherein the program codes when executed cause a computer to function as: an instruction module that instructs each of a plurality of printer drivers to generate an image pattern to be embedded in print image data; an acquisition module that acquires the plurality of image patterns generated by the printer drivers; an embedding module that embeds the acquired plurality of image patterns in the print image data; and a print instruction module that transmits the print image data in which the plurality of image patterns are embedded, to an image forming apparatus.