Represents an access control list (ACL) that is applied to a site collection, Web site, list, or list item.
Assembly: Microsoft.SharePoint (in Microsoft.SharePoint.dll)
An SPReusableAcl object is an opaque object that an application can use to return a Microsoft SharePoint Foundation object that represents an access control list. The SPReusableAcl object can be stored and passed back to SharePoint Foundation for permission checks, and therefore, the object is considered "reusable."
Use the ReusableAcl property of the SPWeb, SPList, or SPListItem class to return the ACL for a Web site, list, or list item. For any class that implements the ISecurableObject interface, you can use the ReusableAcl property to return the ACL. To return the ACL for a site collection, use either the GetReusableAclForScope or GetAllReusableAcls method of the SPSite class.