VMS Help CMS, SET, ACL, Qualifiers, /DEFAULT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Creates an ACL for one or more specified objects as if the object
    were newly created. The /DEFAULT qualifier propagates the DEFAULT
    option ACEs in the ACL of the entity list to the ACL of the
    specified object. This qualifier can be used only with an object
    that is a library entity, that is, either an element, class, or
    group.