Film companies need to keep track of what sells where and control film releases around the world. To do this, they divide the world into several Blu-ray regions. If you buy a Blu-ray player in one part of the world, you can only play films coded for that same region. Movies bought in a different country may not work on your player.
The region split is slightly different to that of DVD, so it's important to double-check the area your player covers.
This map shows how the Blu-ray region split works:
A/1 the Americas (except Greenland), and their dependencies, East Asia (except the Peoples Republic of China and Mongolia), and South East Asia.
B/2 Africa, Middle East, Southwest Asia, Europe,(except Belarus, Russia and Ukraine), Australia, New Zealand and their dependencies.
C/3 Central Asia, East Asia, (China and Mongolia only), South Asia, Eastern Europe and their dependencies.
Some home players will be labelled "Region Free" which means they may play discs from anywhere in the world, and there are many discs from around the world that don't have any region coding. Many specialist Blu-ray internet forums can give you more information on these discs. Your computer's Blu-ray drive will be locked to play region 2 discs, although you will have the chance to change regions (see knowhow article on this) a limited number of times.