诸如apache等Web服务器提供的授权类型可以称为粗粒度访问控制，因为它只提供了一个外部安全层。
The kind of authorization provided by a Web server like Apache might be called coarse-grained access control because it provides only an outer layer of security.
DIFC这种安全手段，让应用程序的作者能够控制应用的组成部分与外部世界之间数据如何流动。
Decentralized Information flow control (DIFC) is an approach to security that allows application writers to control how data flows between the pieces of an application and the outside world.
用户和组的身份验证是在DB 2外部的一个设施中，例如操作系统、域控制器或Kerberos安全系统中进行管理的。
User and group authentication is managed in a facility external to DB2, such as the operating system, a domain controller, or a Kerberos security system.
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