방송의 디지털화가 가속화 되면서 디지털 콘텐츠에 대한 접근과 보호에 대한 중요성이 증대되고 있으며, 특히 케이블 및 IPTV와 같은 유료 방송 서비스를 제공하는 매체의 경우 제한수신시스템의 효과적 운용 여부에 따라 사업의 성패가 좌우될 것이다. 이러한 상황에서 기존 임베디드 CAS 및 CableCARD에서 나타난 여러 가지 문제점들을 해결함은 물론 방송 사업자, 제조업체, 가입자의 새로운 요구 사항들을 수용할 수 있는 다운로더블(Downloadable) 제한수신 기술에 대한 연구가 최근 국내외에서 활발히 진행되고 있다. 본 고에서는 케이블 매체를 기반으로 개발중인 다운로더블 제한수신 기술에 대하여 소개하고, 이와 관련한 국내외 기술개발 동향 및 ITU-T에서의 표준화 동향에 대하여 기술하고자 한다.
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