网际安全（cyber security）的主要任务是构建可信系统（trusting system）,即真伪鉴别的认证系统。认证系统中一般采用两种技术,一种是数字签名,一种是密钥交换。
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ODRL可用于可信和非可信系统中的数字和实体形式的资源。
ODRL can be used within trusted and untrusted systems for both digital and physical assets.
能够跟踪谁说了什么是构建可信系统的必要条件，但只有这一条件，通常还不够。
Being able to trace who said what is a necessary condition for building a system of trust, but this is not generally sufficient by itself.
计算机需要通过域控制器的身份验证，然后才会被视为可信系统，从而得以与域的其他部分进行交互。
The machines need to authenticate with the domain controller, before they're considered trusted systems and allowed to interact with the rest of the domain.
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