BEWARE PS3 Multi region problems

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Just a quick note to  all , whilst the PS3 can play any game from any any region...the downloadable content is region locked,we found this out when downloading COD4 map pack,It will not work with the US version of the game we have! This is a problem  that keeps being asked on the forums etc, remember ,you have to pay for map packs,so stick to your own region!
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