An authorization service is the method that the SSP uses to authorize access to a remote procedure. SSPs can provide more than one authorization service. However, they usually select one as a default.
Your application can use the default authorization method for the current SSP, or it can specify one. At present, Microsoft RPC supports two methods of authorization. One is for the server to provide authorization based on the name of the client program. The other is for the server to compare the client's authentication credentials against the server's access control list (ACL).
For a list of authorization services, see Authorization-Service Constants.
Note It is recommended that developers use RPC_C_AUTHZ_NONE.