view and modify the region code of DVD drives

 Regionset is a small utility which displays and sets
 the region/zone setting of a DVD drive, allowing it to decrypt
 the DVD's sold in this geographical zone. Hardware vendors
 often limit the number of such modifications, but it is
 necessary to set it at least once with a brand new drive.
 .
 URL: http://linvdr.org/projects/regionset/