▁The ▁intention ▁was ▁to ▁provide ▁the ▁list ▁to ▁I SP s ▁to ▁allow ▁un block ing . ▁ ▁Ex amples ▁of ▁over block ed ▁categories ▁reported ▁include : ▁▁ ▁sex ▁education ▁and ▁advice ▁on ▁sexual ▁health ▁ ▁help ▁with ▁sex ▁and ▁por n ography ▁add iction ▁ ▁support ▁services ▁for ▁ra pe ▁and ▁domestic ▁ab use ▁ ▁child ▁protection ▁services ▁ ▁suic ide ▁prevent ion ▁ ▁libraries ▁ ▁parliament , ▁government ▁and ▁polit icians ▁ ▁drug ▁advice ▁ ▁The ▁identification ▁of ▁over block ed ▁sites ▁is ▁made ▁particularly ▁difficult ▁by ▁the ▁fact ▁that ▁I SP s ▁do ▁not ▁provide ▁checking ▁tools ▁to ▁allow ▁website ▁own ers ▁to ▁determine ▁whether ▁their ▁site ▁is ▁being ▁blocked . ▁In ▁July ▁ 2 0 1 4 ▁the ▁Open ▁Rights ▁Group ▁launched ▁an ▁independent ▁checking ▁tool ▁blocked . org . uk , ▁a ▁rev amp ▁of ▁their ▁mobile ▁blocking ▁site ▁to ▁report ▁details ▁of ▁blocking ▁on ▁different ▁fixed ▁line ▁I SP s ▁and ▁mobile ▁prov iders . ▁The ▁tool ▁revealed ▁that ▁ 1 9 % ▁of ▁ 1 0 0 , 0 0 0 ▁popular ly ▁visited ▁websites ▁were ▁being ▁blocked ▁( with ▁significant ▁variation ▁between ▁I SP s ) ▁although ▁the ▁percentage ▁of ▁sites ▁hosting ▁legal ▁por n ographic ▁material ▁is ▁thought ▁to ▁be ▁around ▁ 4 %. ▁▁ ▁Sign ific ant ▁under block ing ▁has ▁also ▁been ▁discovered , ▁with ▁I SP s ▁failing ▁to ▁block ▁up ▁to ▁ 7 % ▁of ▁adult ▁sites ▁tested . ▁A ▁study ▁commission ed ▁by ▁the ▁European ▁Commission ' s