默认情况下，会创建一个ProtectionDomain，并作为“特殊”情况处理，即属于这个域的代码被认为是受信任的并可以获得特殊的权限。
One ProtectionDomain is created by default and is treated "special," in that the code belonging to this domain is deemed trusted and can be granted special privileges.
在以服务为核心的网格计算体系结构中，为了实现信任域之间安全任务调度，服务和用户被赋予信任度标签，利用置信度策略成为解决网格计算资源调度安全的一种手段。
In order to achieve the safe task schedule, the application strategy of confidence-degree endowed by service and user is a way to study in service-centered grid-computing architecture.
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