There are different Video Standards around the world - please choose the right one when ordering your Tricktionary DVD:

NTSC is used by many countries on the American continent as well as many Asian countries including Japan.

PAL is used in most European countries.

NTSC DVD's will play on 90% of all PAL DVD-Players.
PAL DVD's are usually not playable on NTSC DVD-Players.
SECAM countries can read PAL DVD's
Computers can usually display anything - PAL or NTSC.

A detailed list of countries HERE