证书令牌会确定用户对于特定的文档拥有什么样的权限，从而被用于管理对文档的访问。
The credential token establishes what rights one has over a specific document and it is used to manage access to documents.
对文档的灵活访问，不管是网络上的，还是下载还是本地使用，都可以节省硬盘的存储空间。
Flexible access to documentation, either on the web or to download and use locally, which can save hard drive storage space.
Content Manager (CM)需要通过自身内置的用户库来向用户授予对文本文档、视频文件、图片和其他存储在系统中的数据的访问权。
Content Manager (CM) needs its own built-in user repository to grant users access to text documents, video files, pictures, and whatever else is stored in the system.
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