文档库定义两个域角色：Editors被授权修改文档库的内容，而Readers只能查看这些内容。
The document library defines two domain roles: Editors are permitted to modify the contents of the document library, whereas Readers can only view the contents.
每个数据库管理系统都必须能保护数据不会受到未授权访问和修改。
Every database management system must be able to protect data against unauthorized access and modification.
授权的用户可以修改如清单1所示的一些服务参数—例如，配置的带宽。
Authorized users are allowed to modify some of the service parameters shown in Listing 1 -for example, the deployed bandwidth.
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