SYSTEM FOR PREVENTING AND TRACKING ILLEGAL DUPLICATE OF COPYRIGHT IN POWER LINE COMMUNICATION HOME NETWORKING ENVIRONMENT

摘要

A system for preventing and tracking illegal copy is provided to stop a copying process in a PLC(Power Line Communication) home network environment if the illegal copy is discriminated by extracting watermark information from a copy source, comparing an extracted watermark with an original watermark, and discriminating a relation level of both watermarks, and track the illegal copy by transmitting a location information signal through a power line. A copyrighted article(20) includes the watermark information. An illegal copy determiner(30) extracts the watermark information from a copyrighted article, compares the extracted watermark with the original watermark, and transmits an alarm signal if both the relation level of both watermarks is over a threshold in case that the copyrighted article is copied by using a copier. A PLC modem(40) transmits the alarm signal of the illegal copy determiner through the power line. A supervisory reader(60) decodes and tracks the encoded alarm signal transmitted from the PLC modem. The illegal copy determiner includes a memory(31), an extractor(32), a comparator(33), a turbo encoder(34), a modulator(35), an encryptor(36), and a transmission band pass filter(37).