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.
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.
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