Method of preventing multimedia contents from illegally distributing and apparatus using thereof

PURPOSE: A method for preventing illegal distribution of multimedia contents on the Internet and a device using the same are provided to protect rights of a content maker, a service provider, and a legal user by protecting CONSTITUTION: A content filter(210) performs a filtering process by installing to an ISP(Internet Service Provider) center. The content filter comprises a packet analyzer(212), a watermark extractor(214), and a content filtering part(216). The packet analyzer analyzes/discriminates that a currently distributed packet is the contents. The watermark extractor extracts watermark information from a multimedia content packet. The content filtering part filters the multimedia content packet by the extracted information.