（在本例中，我只能通过编程方式访问它，因为与所有内容关联的默认访问控制被设置为拒绝任何未授权访问）。
And in this case, I can only access it programmatically, because the default access controls associated with everything are set to deny any noncredentialed access to it.
自由访问控制(DAC)是大多数操作系统保护机制的核心，DAC的安全性研究关注对象的权限是否被泄漏给未授权主体。
Discretionary access control (DAC) is the kernel of most protection mechanism, and the research on safety of DAC concerns whether rights can be leaked to unauthorized subjects.
由PIN控制的安全性帮助防止对您的敏感的UPS递送信息的未授权的访问。
PIN-controlled security helps prevent unauthorized access to your sensitive UPS delivery information.
目的：确保工厂执行了有效果的实体安全和访问控制，预防对建筑物，运输工具进行未授权的访问。
Purpose: To ensure that the facility has implemented effective physical security and access controls to prevent unauthorized access to the premises, buildings, and conveyances.
目的：确保工厂执行了有效果的实体安全和访问控制，预防对建筑物，运输工具进行未授权的访问。
Purpose: To ensure that the facility has implemented effective physical security and access controls to prevent unauthorized access to the premises, buildings, and conveyances.
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