I just got it from Amazon and it's not R1, R2, R3, R4 like the other seasons, but only R1, R4. So it won't work on a R2 player (like European DVDs) and it's necessary a region free one. Since it's dual coded R1 & R4, it is not necessary to have a region free DVD player if you do have a R4 DVD player (e.g. Australia & New Zeland are R4).
On www.dvdrhelp.com click on "dvd hacks"
www.dvdrhelp.com/dvdhacks
Here it's possible to look for region code hacks for DVD players. If you are lucky your DVD player's hack might be just pressing some buttons with its remote. If you change the region of your DVD player to "region free", the warranty might not be valid anymore. Some hacks are reversible.
E.G.
Philips 634
open the cd tray press "1111" and then "0" for all regions
And with 1111,2 it would be back to region 2.
Sebastiano