/sys$common/syshlp/helplib.hlb SET, VOLUME, Qualifiers, /PROTECTION  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /PROTECTION=(ownership[:access][,...])

    Specifies the protection to be applied to the volume. The
    following rules apply:

    o  Specify the ownership parameter as system (S),  owner (O),
       group (G),  or world (W).

    o  Specify the access parameter as read (R),  write (W), create
       (C),  or delete (D).

    The default protection is all types of access by all categories
    of user.