'if you bought a Full retail copy of Windows 8.1, then you can but otherwise, no.'
SR71 Says any o.e.m. C.O.A. of W8 can be moved, and he posts microsofts terms and conditions on here to prove it. I am not saying I read them of course, as I am a lazy git but I dont think he is as it would be pointless to make summat like that up while the pub is open..