For multiple reasons I've settled on using Windows 10 Enterprise LTSB.
Apart of getting a fake key or getting a legitimate key revoked, what are the dangers of purchasing / applying an unknown product key to your windows system ?
Edit: I'm willing to take the risk of getting a non-working cd key, on the other hand I'm afraid of having my system compromised by a malicious vendor. Do they have any sort of control on your system via the license / key ?