VMS Help DIRECTORY, Qualifiers, /SECURITY  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Controls whether information about file security is displayed;
    using the /SECURITY qualifier is equivalent to using the /ACL,
    /OWNER, and /PROTECTION qualifiers together. ACEs that were
    created with the hidden option are displayed only if the SECURITY
    privilege is turned on.

    For further information, refer to the OpenVMS Guide to System
    Security.