US Patent 7952732 Image processing apparatus

A digital multi-function peripheral appends, according to the predetermined specific image information appending conditions, the image data which meets the appending conditions with the specific image information in a form which is set in accordance with the appending conditions when image data which is read at an image reading portion or image data which is externally entered via a FAX modem or communication portion is used for image formation at a printing portion. It is set so that the specific image information is appended to high secrecy image data. When trying to copy the printed image in which the specific image information is embedded, the copy machine which has detected the specific image information will not output the copied image or output a copy sheet having thereon characters such as “Copy Prohibited”.