but it's a new mobo,where did it come from?

but then again, isn't it one key for each pc...since this a new system it shoule require a new key or transfered from old mobo

i'm gonna try and check with microsoft, this is really weird and i feel like they're spying on me . i mean certain changes in hardware is one thing, this a whole new system. the only thing that i use back is the ssd and it's totally formatted before fresh install.