Lenovo G480 Remove Windows License

Hi
I have a Lenovo laptop model G480 20149 core I3, and he comes whith Windows 8 STD SGL serial on bios.
I wanna to know if a can remove this serial for installing othrer version of Windows, like Windows 8.1 using the UEFI, secure boot and GPT partition options.
I hope you can uderstand my poor english. Sorry.
Thanks.