A method of configuring a printing system includes providing a document key having an initial image and providing a printing system that includes a memory storing a first system setting. Unlike prior digital asset management platforms which could enforce encryption or other protection simply around the entire object, the invention permits individualized control over separate media components, to permit distribution for example of some parts, such as text passages, while preventing unauthorized access or copying of audio, photographic, video or other files or content. The current-sense circuit generates a current-sense signal in response to an output current of the power supply. An image operation is performed on gray scale image data to identify intensity transitions of a first digital image.