Not all blu-ray discs are region-coded. Warner Bros don't region code any of their releases, for example.
Other studios used to enforce region coding early on but most appear to have toned down on that nowadays.
That limitation is very easily bypassable.
Only a few players can be unlocked via remote control. Kogan and Soniq are the only companies I know of that sell such units, though not all Soniq models are region changeable.Blu-Ray discs may been region coded but you can unlock some Blu-Ray players with a simple code.
*Pets my region changeable Soniq unit*