Well what is the specific of the transmission between the Wiimote and the Wii?
is it like:
left 2 sec, A, B,
or:
Wii code 1, Wii code 2, Wii code 3.
cause the fact that you can use it on PC only means you can write a software to read the code, that doesn't make it legal if it's the code too that is patented. And seeing as there are no other devices that has the same range of functions and buttons as the Wiimote, i'd be sure there is something in there where the code is specific to the Wii and patented... Thus making it illegal to hijack the Wiimote for other uses.
Now if they did do their Xmote and the device happends to be hackable to read Wiimotes signal, then there is nothing MS would be responsible for... but just the Wiimote, no.
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