An image data processing device allowing both of user side and provider side to obtain benefits, leading to market expansion, is disclosed. When an image content is copied, an additional watermark is inserted into the copied image content. When an additional watermark is detected from input image content...http://www.google.es/patents/US20020061122?utm_source=gb-gplus-sharePatente US20020061122 - Image data protection technique
Número de solicitud: 10/036,040 Número de publicación: US 2002/0061122 A1 Fecha de presentación: 26 Oct 2001 Patente emitida: US7050604 ( Fecha de emisión 23 May 2006)
