See DVD, CSS and Blu-ray region codes. Region Code Location 0 Unrestricted 1 U.S. and territories, Canada, Bermuda 2 U.K., Western Europe, Greenland, Japan, Middle East, Egypt, ...

I purchased a dvd advertised as region free from australia, and everytime I put it in the DVD player it tells me "Check DVD". It plays fine on my PC (my DVD drive is set to region 1).