Most cheap ass DVD systems made in China don't have the region code restiction. Buy a no name DVD player for $100 or less and you can watch any DVD's from anywhere. Or you can get someone to modify your current system. Mine plays all.
Also, if you have a DVD player on your computer you can play both PAL and NTSC versions of DVD's. You can also change the regions codes.
'02 C32 AMG / '07 C280 / '07 CLS550 / '15 JKU Rubicon