Method to log whether a known document image has been used by a system
Publication Date: 2004-Dec-23
The IP.com Prior Art Database
This invention is an application of US 6687385, "Method for steganographic encoding." For each document image that passes through a system, a function is estimated that maps the document image to a message. The function alone cannot be used to determine the message nor the image with which it was derived. Each document image produces a unique function and that function is archived for each image. The message may contain a machine or software serial number, a time stamp, or a user id. At some point, when one wants to know whether a given system component was used on a known image, each function in the archive is applied to the image and the one generating a message is considered a "hit."