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

 object-name

    Specifies the name of an object whose security profile is to
    be displayed. If the object class is SECURITY_CLASS, you can
    specify an asterisk (*) as object-name to see a display of
    all security class objects. An object name of the FILE class
    (explicitly or implicitly specified) can include the asterisk
    (*)  and the percent sign (%) wildcard characters; however,
    wildcard characters are not allowed in any class other than FILE
    or SECURITY_CLASS.