System, method and medium for utilizing digital watermarks in instructional material

摘要

A system, method and medium that embeds an imperceptible or substantially imperceptible watermark in an image on a page of instructional material. Upon using an optical reading device to read the watermark, a computer can launch, for example, an application program used to provide, for example, context sensitive information, one or more learning assessment activities, and/or information for the physically impaired, and/or redirect a user to an educationally relevant web page as directed by the watermark.