The way it works :
DVD hardware ( the player itself ) either has a region code ( randing from 1 to 5 ) or is region-free. If it's not region free you can make it region free yourself !
Go here and follow the instructions :
Unlock your DVD player
Now, the discs themselves also have region codes on them. You can remove these also by copying them using sofware on your PC. But only 1 of the 2 ( either the player or the disc ) needs to be region free. So just keep it simple : Make your player region-free using the tip above and you will have no problems.