Provided is an image processing system capable of simply executing image processing for encryption and decryption without causing a user to perform a time-consuming operation of generating a processing target image, the system including: a rendering information input accepting unit 21 accepting an input of rendering information for depicting a content of electronic data; a digital image generating unit 15 generating a digital image defined on the basis of the accepted rendering information; a definition information acquiring unit 23 acquiring definition information containing area designating information for specifying an encrypting target partial area in the generated digital image and key information used on the occasion of encrypting the partial area; an encrypting unit 11 generating an encrypted image by converting the image of the partial area on the basis of the key information; and an output unit 12 outputting the encrypted image.