1. A method for a printing system to print an image based on image data received from a source comprising: determining if the source of the image data is a secure or non-secure source; if the source is determined to be a secure source, printing the image using the image data as received; if the source is determined to be a non-secure source, modifying the image data to alter a graphic security feature included in the image data; and printing the image using the modified image data.