This function notifies the security system that credentials are no longer required. An application calls this function to free the credential handle acquired in the call to the AcquireCredentialsHandle function. When all references to this credential set have been removed, the credentials themselves can be removed.
[in] Pointer to a CredHandle structure representing the handle to the credentials. This handle is obtained by using the AcquireCredentialsHandle function. For information on CredHandle, see SSPI Handles.