it it legal to use COA from scrap PC form ebay?

[cryptotooth]

I've seen a lot of listings on ebay that advertise a scrap or crushed PC for £5 with a COA for windows. You apparently buy the whole machine and they send you the COA in an envelope to use on your PC without the machine it came from. Is it legal to do this? Apparently the key is valid as long as you get the right version for your machine, so a Dell COA for a Dell PC and as long as that key is only being used on that machine it is OK. Personally I don't believe this and think that MS would prohibit this, but is it actually legal to use the key you bought form them?

 

[PsyKhiqZero]

No, OEM copies are licensed to the original machine it's installed on. With that said the keys typically do work. Windows 10 now registers the key online and binds it to the motherboard. So if it's a windows 10 key I doubt it will work.

Disclaimer. I've never dealt with a third party COA dealer. So I'm not saying their keys will work.