Is it legal to use Windows 10 OEM Key on a custom built computer?

[SadatNafis]

Hi I am planing to buy a new computer. But a catch with it is that I need to get an Windows 10 key.


I saw sites like Kinguin and G2A where they sell Windows 10 OEM keys for 15-20$.


I just wanted to be sure if getting those keys and activating on my custom built pc is legal or not.

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