[TheFluff]

Use a proper player that uses DeCSS or something similiar and you won't ever have to care. BTW, DeCSS is quite legal in Norway.

Proper players that don't cost money include, but is not limited to:
MPC
MPlayer
VLC (not really proper, but it does play DVD's)

I have a perfectly normal DVD player in my computer and I haven't ever had to switch regions for it. DVD region lockin is just a part of CSS, and CSS was cracked years ago. It's not even illegal (not in most European countries at least) to use region free DVD players or use a program that circumvents CSS for your own watching purposes.