본 논문에서는 불법으로 복제된 컨텐츠의 근원지를 확인할 수 있는 핑거프린팅 기법을 제안하고 있다. 판매자와 구매자의 키로 만들어진 균일 랜덤 신호를 시간축 웨이블릿 변환에 의해 얻어진 계수 중에서 배포 받을 사용자의 영역에 삽입하여 핑거프린팅을 수행하게 된다. 제안기법은 핑거프린팅된 컨텐츠에 대한 공모공격과 MPEG2 압축에도 유일한 핑거프린팅 정보를 감지할 수 있다. 특히, 핑거프린팅 정보를 삽입할 사용자의 영역 지정을 위해서 시간축 웨이블릿 변환의 특성을 이용한다. 실험에서는 비디오 컨텐츠의 불법 배포를 추적할 수 있음을 보이고, 다양한 공모공격과 MPEG2 압축에 대해 강인(robustness)함을 보인다.
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