DVD regions are defined as:
Region 1 - 1: U.S., Canada, U.S. Territories
Region 2 - Japan, Europe, South Africa, and Middle East (including Egypt)
Region 3 - Southeast Asia and East Asia (including Hong Kong)
Region 4 - Australia, New Zealand, Pacific Islands, Central America, Mexico, South America, and the Caribbean
Region 5 - 5: Eastern Europe (Former Soviet Union), Indian subcontinent, Africa, North Korea, and Mongolia
Region 6 - Peoples Republic of China
Region 0 DVDs can be played in any DVD player regardless of their Region Coding, but the system format (PAL/NTSC see below) must still be supported.
PAL/NTSC VIDEO
Most U.S. DVD players only support NTSC video while most European players supports both NTSC and PAL. In order to play a disc the player needs to support both the region and the video format. This means that most players in the USA can't play a European PAL release. Region Free NTSC DVD players can output a PAL signal, but unless the player has an internal PAL to NTSC converter or you have a standalone PAL to NTSC converter, the video output cannot be viewed correctly.
