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

       /OWNER_UIC=uic

    Specifies an owner user identification code (UIC) for the volume.
    The default is your default UIC. Specify the UIC using standard
    UIC format as described in the OpenVMS Guide to System Security.

    For magnetic tapes, no UIC is written unless protection on the
    magnetic tape is specified. If protection is specified, but no
    owner UIC is specified, your current UIC is assigned ownership of
    the volume.