Represents a user or group that can be assigned permissions to control security.
Assembly: Microsoft.SharePoint.Client (in Microsoft.SharePoint.Client.dll)
When a user or group is added to a site, the user or group is the principal. The object can represent one of the following types of users or groups:
Non-Windows user (provided through ASP.NET membership provider)
Non-Windows group (provided through ASP.NET roles provider)