An image forming apparatus for forming an image based on data received from a plurality of data sources of different kinds includes a receiver for receiving data from each of the plurality of data sources; a memory for storing data received by the receiver; a recording unit for forming an image based...http://www.google.com/patents/US6342949?utm_source=gb-gplus-sharePatent US6342949 - Image forming apparatus that prevents recording in an undesired image formation mode
