DATA-UPDATE APPARATUS, REPRODUCTION APPARATUS, DATA- ADDITION APPARATUS, DATA-DETECTION APPARATUS AND DATA- REMOVAL APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a data-update apparatus which greatly reduces the amount of operation required for adding, detection, removal and update of data (electronic watermark) in a plurality of signals and which realizes rigid copyright protection. SOLUTION: The data-update apparatus comprises: a channel selection means that selects and outputs part of the channels of the input signal; a detection means that detects the electronic watermark that is embedded in the signal of the channel selected by the channel-selection means; a judgment means, to which the data detected by the detection means is input, and that determines whether or not to update the electronic watermark; an update-signal-generation means to which an update instruction is input from the judgment means and to which the signal of the channel selected by the channel-selection means is input, and that outputs an update signal for updating the detected data; and a channel-selection-addition means that selects part of the channels of the input signal and adds the update signal to the selected channels. COPYRIGHT: (C)2003,JPO