DVD Region Locking is a system used to control which DVD movies play
on which DVD Players.
The different DVD regions are broken down as follow:

Region 1 - The U.S., U.S. territories and Canada
Region 2 - Europe, Japan, the Middle East, Egypt, South Africa, Greenland
Region 3 - Taiwan, Korea, the Philippines, Indonesia, Hong Kong
Region 4 - Mexico, South America, Central America, Australia, New Zealand,
Pacific Islands, Caribbean
Region 5 - Russia (okay, former Russia), Eastern Europe, India, most
of Africa, North Korea, Mongolia
Region 6 - China
Region 7 - Unused
Region 8 - Airlines, Cruise Ships
This means that movies from Region 1 (USA & Canada)
WILL NOT play on a DVD drive intended for regions 2-6. Effectively,
you can only play Region 1 discs on
Region 1 DVD drives, Region 2 discs on Region 2 DVD drives
and so on.