CONTENT SERVER, CONTENTS RECEIVER, NETWORK SYSTEM, AND METHOD FOR ADDING INFORMATION TO ITS DIGITAL CONTENT

摘要

PROBLEM TO BE SOLVED: To embed electronic watermarks different for each access in digital contents without increasing the load of a content server as much as possible. SOLUTION: This content server is provided with an electronic watermark embedded content storing part 13 in which a plurality of digital contents embedded with different electronic watermarks are stored and a finger print executing part 14 for reading the plurality of digital contents from the electronic watermark embedded content storing part 13, and for switching and compounding the digital contents for each specific part to add the very beginning information to the digital contents by using a bit string formed by the electronic watermark embedded in every portion of the digital contents. COPYRIGHT: (C)2004,JPO