Do you know about DVD regions encoding?

DVD Region Encoding

Global region codes identify specific DVDs that are compatible with the players typically sold in that region. The majority of all current titles play in only one specific region unless otherwise noted. 

Standard DVDs:

(1) U.S., U.S. Territories, Canada, and Bermuda

(2) Japan, Europe, South Africa, and the Middle East, including Egypt 

(3) Southeast Asia, East Asia, including Hong Kong 

(4) Australia, New Zealand, Pacific Islands, Mexico, Central America, South America, and the Caribbean 

(5) Former Soviet Union, Indian subcontinent, Africa, North Korea, and Mongolia 

(6) China 

Blu-Ray DVDs:

A/1: North America, Central America, South America, Japan, North Korea, South Korea, Taiwan, Hong Kong and Southeast Asia. 

B/2: Europe, Greenland, French territories, Middle East, Africa, Australia and New Zealand. 

C/3: India, Nepal, Mainland China, Russia, Central and South Asia. 

There is also region codes for VHS tapes:

60 Hz, NTSC format used in North America and Japan. NTSC videotapes will not work on most videocassette players in countries that use PAL, SECAM, or other video standards.

PAL-format VHS tapes will work on most players in Europe, Australia, China, and parts of the Middle East.

SECAM-format VHS tapes will work on players in France.

/source Amazon