1 8 ▁the ▁Sound Ex change ▁subs idi ary ▁S X Work s ▁launched ▁NO I ▁( Not ice ▁of ▁Int ention ) ▁Look up . ▁ ▁It ▁allows ▁song writ ers ▁and ▁publish ers ▁to ▁search ▁a ▁U . S . ▁copy right ▁database ▁which ▁indexes ▁" Address ▁Un known " ▁not ices , ▁the ▁term ▁used ▁when ▁a ▁music ▁service ▁files ▁an ▁intention ▁to ▁use ▁a ▁musical ▁work , ▁but ▁claims ▁that ▁they ▁cannot ▁locate ▁the ▁copy right ▁owner . ▁A ▁free ▁tool , ▁it ▁allows ▁copy right ▁own ers ▁to ▁identify ▁their ▁work . ▁In ▁ 2 0 1 7 , ▁an ▁average ▁ ▁of ▁ 2 . 5 ▁million ▁month ly ▁address ▁unknown ▁NO I ▁fil ings ▁were ▁submitted ▁to ▁the ▁US ▁Copy right ▁Office ▁by ▁music ▁services . ▁ ▁Crit ic ism ▁A ▁ 2 0 0 7 ▁royal ty ▁rate ▁increase ▁was ▁reported ▁as ▁establish ing ▁a ▁rate ▁that ▁would ▁" render ▁Internet ▁radio ▁uns ust ain able , ▁or ▁at ▁the ▁very ▁least , ▁more ▁ad - lad en ▁than ▁terrest rial ▁radio ." ▁ ▁Crit ics ▁charged ▁that ▁in ▁negoti ating ▁the ▁royal ty , ▁Sound Ex change ▁was ▁concerned ▁primarily ▁with ▁major ▁labels ▁and ▁their ▁artists . ▁Th ous ands ▁of ▁internet ▁broad c aster s ▁participated ▁in ▁a ▁" day ▁of ▁silence " ▁protest ▁by ▁can cell ing ▁their ▁programming ▁on ▁June ▁ 2 6 , ▁ 2 0 0 7 . ▁ ▁See ▁also ▁Performance ▁rights ▁organization ▁Copy right ▁Royal ty ▁Board