Authorization refers to the process by which Windows SharePoint Services provides security for Web sites, lists, folders, or items by determining which users can perform specific actions on a given object.
The authorization process assumes that the user has already been authenticated, which refers to the process by which Windows SharePoint Services identifies the current user.
Windows SharePoint Services does not implement its own system for authentication or identity management, but instead relies solely on external systems, whether Microsoft Windows or non-Windows authentication.
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