Yes, but if I buy a PC with Windows I have the right to install Linux on it.
Linux is, unlike bookeen firmware, free (in both sence of the terem). While firmware from bookeen or pocketbook are proprietary. Devlopers from pocketbook need to be paid right ? (Oh, yeah, I forgot, firrmware are devloped just by snapping yourr fingers, no need to pay peaple for that...)