Electronic-watermark control apparatus and method, information control apparatus and method, and storage medium capable of being read by a computer

摘要

An information control apparatus includes a superposition circuit for superposing a plurality of elements, each having electronic-watermark information, to provide a set of data, a determination circuit for determining, prior to superposition, a state of respective sets of electronic-watermark information after the superposition, and a notification circuit for notifying of the determined state.