▁by ▁the ▁author , ▁or ▁it ▁may ▁be ▁left ▁to ▁the ▁dis cret ion ▁of ▁the ▁user , ▁based ▁on ▁individual ▁per ception s ▁of ▁the ▁software ' s ▁value . ▁Since ▁don ation ware ▁comes ▁fully ▁oper ational ▁( i . e . ▁not ▁cri pp le ware ) ▁with ▁payment ▁optional , ▁it ▁is ▁a ▁type ▁of ▁fre ew are . ▁ ▁Nag ware ▁ ▁Nag ware ▁( also ▁known ▁as ▁beg ware , ▁anno y ware ▁or ▁a ▁n ags creen ) ▁is ▁a ▁pe jor ative ▁term ▁for ▁share ware ▁that ▁persist ently ▁rem inds ▁the ▁user ▁to ▁purchase ▁a ▁license . ▁It ▁usually ▁does ▁this ▁by ▁po pping ▁up ▁a ▁message ▁when ▁the ▁user ▁starts ▁the ▁program , ▁or ▁inter mitt ently ▁while ▁the ▁user ▁is ▁using ▁the ▁application . ▁These ▁messages ▁can ▁appear ▁as ▁windows ▁obsc uring ▁part ▁of ▁the ▁screen , ▁or ▁as ▁message ▁boxes ▁that ▁can ▁quickly ▁be ▁closed . ▁Some ▁nag ware ▁keeps ▁the ▁message ▁up ▁for ▁a ▁certain ▁time ▁period , ▁forcing ▁the ▁user ▁to ▁wait ▁to ▁continue ▁to ▁use ▁the ▁program . ▁Un lic ensed ▁programs ▁that ▁support ▁printing ▁may ▁super im pose ▁a ▁wat erm ark ▁on ▁the ▁printed ▁output , ▁typically ▁stating ▁that ▁the ▁output ▁was ▁produced ▁by ▁an ▁un lic ensed ▁copy . ▁ ▁Some ▁titles ▁display ▁a ▁dialog ▁box ▁with ▁payment ▁information ▁and ▁a ▁message ▁that ▁pay ing ▁will ▁remove ▁the ▁notice , ▁which ▁is ▁usually ▁displayed ▁either ▁upon ▁startup ▁or ▁after ▁an ▁interval ▁while ▁the ▁application ▁is