I have no idea what a "multi region" blu ray player is/means
I'll try n simplify it for ya bud...
Any blu-ray players that you buy at Walmart, Best Buy, etc. here in Canada or the States can only play Region 1 DVD's or Region A blu-rays as that's how our discs are regionally encoded or locked. So if you tried to play a Region 2 DVD or a Region B blu-ray (from England) in a store bought North American player...the disk wouldn't play as it would be "locked" regionally and only playable on a blu-ray player from wherever non North American country that disk was from.
However, my multi-region blu-ray/DVD player is a blu-ray/DVD player that has been professionally hacked/modded (with a chip I think) to play any DVD or blu-ray regardless of whatever region the disk is from.
I.E. I can play Region B blu-rays from Germany/the U.K. for instance despite being here in Canada.