DVD regions

DVD region codes are a digital rights management technique designed to allow film distributors to control aspects of a release, including content, release date, and price, according to the region.

This is achieved by way of region-locked DVD players, which will play back only DVDs encoded to their region (plus those without any region code). The commercial DVD player specification requires that a player designed to be sold in a given place play only discs encoded for that region (plus those without any region code).

Regions - 

code	Area
0	Informal term meaning "worldwide". Region 0 is not an official setting; discs that bear the region 0 symbol either have no flag set or have regions 1–6 flags set. Region 0 is commonly referred to as "Region Free", especially when talking about DVD and Blu-ray Disc players.
1	United States, Canada, Bermuda, Caribbean, U.S. territories
2	Europe, Middle East, Egypt, Japan, South Africa, Swaziland, Lesotho, Greenland, French Overseas departments and territories
3	Southeast Asia, South Korea, Taiwan, Hong Kong, Macau
4	South America, Central America, Mexico, New Zealand, Australia, Papua New Guinea and much of Oceania
5	Bangladesh, India, Nepal, Afghanistan, Sri Lanka, Ukraine, Belarus, Russia, Kazakhstan, Pakistan, Africa (except Egypt, South Africa, Swaziland, Lesotho), Central Asia, Mongolia,North Korea
6	China
7	Reserved for future use, MPAA-related DVDs and "media copies" of pre-releases in Asia
8	International venues such as aircraft, cruise ships, spacecraft, etc.
ALL	Region ALL discs have all eight flags set, allowing the disc to be played in any location, on any player.