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

       /PROTECTION[=(code)]

    Output Save-Set Qualifier

    Defines the protection you want applied to a save set on a disk
    or to a magnetic tape volume. The code indicates the type of
    access (read, write, execute, and delete) available to the four
    categories of users (system, owner, group, and world).

    Protection information applies to all save sets stored on a
    tape. If you write the save set to either a Files-11 disk or a
    sequential disk without using the /PROTECTION qualifier, the
    default is the process default protection.

    To initialize a magnetic tape with the correct protection,
    specify the output save-set qualifier /REWIND with the
    /PROTECTION qualifier. If you do not specify /REWIND with
    /PROTECTION, the protection information, if any, in the volume
    header record is not changed. However, specifying /PROTECTION
    without /REWIND ensures that continuation volumes receive the
    correct protection.