Technically the discs of the Planet Earth and Life series are RegionFree, BUT the LIFE discs are encoded (or at least parts are) as 1080i50Hz which by all reports will not play of Region A (US/North American) Blu Ray players. There are other US players that can handle these discs, but the US/NA PS3 is not one of them. There were rumors that firmware update was supposed to change this, but those rumors proved false. Again when FW 3.5 was released there was hope, but so far no confirmed reports that this has changed. The Region B and most international PS3 handle the 50Hz material without problem so the units at least have that potential, but nobody will confirm if this is a software or hardware limitation.