VMS Help TCPIP Services, Programming Interfaces, RPC Client Routines, auth_destroy, Description  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Frees the memory associated with the AUTH data structure created
    by the authnone_create, authunix_create, or authunix_create_
    default routine. Be careful not to reference the data structure
    after calling this routine.