You didn't give us enough info to give you a straight answer. Did you buy a retail copy of Windows 8, e.g. a boxed copy? Or is that a copy of Windows that came w/ a computer?
But just so you know:
Retail licenses of Windows are licensed for one computer at a time, but it can be moved to another computer if you wanted (uninstall the first one, then install/activate on the new one).
OEM licenses of Windows are only licensed for that one device it came with *ever*. No installing on additional computers, no moving the activation to another computer.
You could also just read the terms yourself: