As I’ve been working in the States twice in the last two years and spent most of the last season working with video I’ve had to change my DVD region several times, which is limited to 5-6 changes by default. So for entirely legitimate purposes I need to change regularly.
At last (turns out it was written in February) someone has put together a reasonable tutorial for the procedure of converting an RPC-2 (non ‘malleable’, region locked) drive into an RPC-1 (you can unlock and change regions) drive. Check it out here:
http://forums.mactalk.com.au/29/39845-solved-region-free-dvd-playing-macbook-pro.html