you can play them if you get your player made into a multi region player you can do this yourself in a few ways, look your make and model up on the net and you may find it listed to do this

region 1 signifies that it for the US anongst other countries market and region 2 is for the european market

if you cant find any codes, post the make and model on here and we can look it up for you. good luck :D