▁as ▁video ▁formats , ▁i . e ., ▁N T SC ▁and ▁P AL ). ▁ ▁A ▁regional ▁lock out ▁may ▁be ▁enfor ced ▁for ▁several ▁reasons , ▁such ▁as ▁to ▁st agger ▁the ▁release ▁of ▁a ▁certain ▁product , ▁to ▁avoid ▁losing ▁sales ▁to ▁the ▁product ' s ▁foreign ▁publish er , ▁to ▁maxim ize ▁the ▁product ' s ▁impact ▁in ▁a ▁certain ▁region ▁through ▁local ization , ▁to ▁h inder ▁grey ▁market ▁imports ▁by ▁enfor cing ▁price ▁disc rim ination , ▁or ▁to ▁prevent ▁users ▁from ▁accessing ▁certain ▁content ▁in ▁their ▁territory ▁because ▁of ▁legal ▁reasons ▁( e ither ▁due ▁to ▁c ensor ship ▁laws , ▁or ▁because ▁a ▁distrib utor ▁does ▁not ▁have ▁the ▁rights ▁to ▁certain ▁intellectual ▁property ▁outside ▁their ▁specified ▁region ). ▁ ▁Mult imedia ▁ ▁Disc ▁regions ▁ ▁The ▁DVD , ▁Bl u - ray ▁Disc , ▁and ▁U MD ▁media ▁formats ▁all ▁support ▁the ▁use ▁of ▁region ▁coding ; ▁DVD s ▁use ▁eight ▁region ▁codes ▁( Region ▁ 7 ▁is ▁reserved ▁for ▁future ▁use ; ▁Region ▁ 8 ▁is ▁used ▁for ▁" intern ational ▁ven ues ", ▁such ▁as ▁air plan es ▁and ▁cru ise ▁ships ), ▁and ▁Bl u - ray ▁Dis cs ▁use ▁three ▁region ▁codes ▁corresponding ▁to ▁different ▁areas ▁of ▁the ▁world . ▁Most ▁Bl u - ray s , ▁however , ▁are ▁region - free . ▁ ▁On ▁computers , ▁the ▁DVD ▁region ▁can ▁usually ▁be ▁changed ▁five ▁times . ▁Windows ▁uses ▁three ▁region ▁coun ters : ▁its ▁own ▁one , ▁the