APPARATUS FOR INSERTING A WATERMARK TO A CONTENT AND DETECTING THE INSERTED WATERMARK AND A METHOD THEREOF

摘要

PURPOSE: An apparatus for inserting a watermark to a content and detecting the inserted watermark is provided to improve the reliability of watermark detection. CONSTITUTION: A method for inserting a watermark to a content and detecting the inserted watermark comprises steps of: phase shifting for a bandwidth spread denotation to a predetermined shift amount by a first bet group value which is included in a data corresponding to the watermark; and selectively changing conversion factor of a content by the bit value of each bit sequence including the shifted bandwidth spread denotation.