数字版权管理系统（当值议员）的手段，指派访问数字内容。
Digital Rights Management systems (DRMs) are means of assigning access to digital contents.
苹果的数字版权管理系统叫FairPlay，应用最为广泛。
Apple's DRM system, called FairPlay, is the most widespread.
IP条件接收系统和数字版权管理系统是目前这个领域内两种主要的内容保护技术解决方案。
IP CAS and IP DRM are two primary Content Protection technologies in this field at present.
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