지상파DTV 방송프로그램에 대한 보호에 대한 요구가 커짐에 따라, 지상파 방송프로그램에 대한 보호를 위한 여러 가지 조치가 시도되고 있다. 최근 ATSC의 RC 기술자를 기반으로 방송프로그램의 저작권 보호를 위한 방송프로그램 보호 기술규격이 표준화가 진행 중이다. 본 논문에서는 방송프로그램 보호신호(Program Protection Information:PPI)에 기반한 지상파 방송프로그램 보호 셋탑 장치를 제안한다. 제안하는 보호 셋탑 장치는 PSIP/PSI 신호를 해석하여 ATSC의 RC 서술자에 포함된 PPI 신호를 추출, 해석한다. PPI 신호에 정의된 정보를 기반으로 저작권 정보가 표시된 방송프로그램은 A/V 정보가 암호화되어 저장되며, 다른 장치와의 호환성을 유지하기 위해, 암복호화 정보는 파일과 함께 패키징되어 저장된다. 본 논문에서 제안한 지상파 방송프로그램 보호셋탑은 방송프로그램 보호신호에 따라, 방송프로그램을 보호할 뿐 아니라, 사용자의 사적이용을 지원하기 위한 제한적인 배포 기능을 제공한다.
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