Library /sys$common/syshlp/acledt.hlb NOPROP_FLAG  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    OPTION=NOPROPAGATE

    Indicates that the ACE cannot be copied by operations that
    usually propagate ACEs. For example, the ACE cannot be copied
    by the SET SECURITY/LIKE or SET SECURITY/DEFAULT commands.