Maximal Discretionary Access Control (MDAC) is the access control policy of owner-centric file sharing mechanism in grid environment, we define MDAC based on the method of BLP model.

• 完全自主型访问控制(MDAC)是所有者为中心的共享机制实现网格环境访问控制的策略,本文用BLP模型的方法对MDAC进行了定义。