▁on ▁FO U O ▁information . ▁ ▁On ▁March ▁ 6 , ▁ 2 0 2 0 ▁the ▁Do D ▁replaced ▁Do DM ▁ 5 2 0 0 . 0 1 ▁Volume ▁ 4 ▁with ▁Do DI ▁ 5 2 0 0 . 4 8 . ▁The ▁term ▁" FO U O " ▁had ▁been ▁defined ▁in ▁Do DM ▁ 5 2 0 0 . 0 1 ▁Vol ▁ 4 . ▁It ▁is ▁no ▁longer ▁in ▁the ▁replacement ▁document ▁Do DI ▁ 5 2 0 0 . 4 8 ▁except ▁as ▁reference ▁as ▁to ▁not ▁requiring ▁a ▁" U " ▁mark ing ▁in ▁the ▁b anner ▁or ▁footer ▁sign ifying ▁un class ified ▁information ▁as ▁was ▁required ▁with ▁the ▁" old ▁FO U O ▁mark ing " ▁( para ▁ 3 . 4 . b .( 1 )). ▁ ▁Australia ▁For ▁Official ▁Use ▁Only ▁( FO U O ) ▁is ▁one ▁of ▁five ▁categories ▁of ▁the ▁D iss em ination ▁Lim iting ▁Mark er ▁( DL M ) ▁defined ▁by ▁the ▁Australian ▁Government ▁Information ▁Security ▁Management ▁Gu idel ines . ▁The ▁gu idel ines ▁state ▁that ▁FO U O ▁should ▁only ▁be ▁used ▁on ▁un class ified ▁information , ▁when ▁its ▁comprom ise ▁may ▁cause ▁limited ▁damage ▁to ▁national ▁security , ▁Australian ▁Government ▁ag encies , ▁commercial ▁entities ▁or ▁members ▁of ▁the ▁public . ▁However ▁unlike ▁the ▁United ▁States ▁usage , ▁the ▁presence ▁or ▁absence ▁of ▁an ▁FO U O ▁marker ▁express ly ▁does ▁not ▁provide ▁any ▁information ▁about ▁the ▁document ' s