Hi,
Also, DVD and Blu-ray have different parameters:
DVD Region 0-8
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 region 16 flags set.
1 Canada, United States; U.S. territories; Bermuda
2 Europe (except Russia, Ukraine and Belarus); Middle East; Egypt; Japan, South Africa, Swaziland, Lesotho; French overseas territories; Greenland
3 Southeast Asia; South Korea; Taiwan; Hong Kong; Macau
4 Mexico; Central and South America; Caribbean; Australia; New Zealand; Oceania
5 Ukraine; Belarus; Russia; Africa (except Egypt, South Africa, Swaziland, Lesotho and French overseas territories); Central and South Asia; Mongolia; North Korea
6 People's Republic of China; Hong Kong
7 Reserved for future use (found in use on protected screener copies of MPAA-related DVDs and "media copies" of pre-releases in Asia)
8 International venues such as aircraft, cruise ships, etc.
Blu-Ray
'A', 'B' and 'C'.
Region A includes most North, Central and South American and Southeast Asian countries plus Taiwan, Hong Kong, Japan and Korea.
Region B includes most European, African and southwest Asian countries plus Australia and New Zealand.
Region C contains the remaining central and south Asian countries, as well as China and Russia.
Cheers!