Open a Command prompt (Admin) and enter slmgr /dlv [press return] and post a screenshot of the result. This will check the current licence.
Is it a branded device, HP, Dell etc.
Sorry I see a ROG is an Asus. The licence should be embedded in the bios. To see the product key provided by Asus using the same Command prompt as before enter
wmic path SoftwareLicensingService get OA3xOriginalProductKey [press return] it should show the 25 character key provided by Asus.