Legality of Using Non-Polish Windows 10 Pro OEM Licenses from Allegro in Poland

Hello

I want to buy a Windows 10 license for a new computer that I ordered for the office. OEM licenses sold on Allegro are a multitude at various prices. I skip offers with Dreamspark / MSDN keys from abroad and without invoices. The Microsoft license says clearly that you can't move a system once activated to another computer, even after previous uninstallation, and buying a non-Polish version of the system and using it in Polish is also a violation of license terms (regarding Windows Home and Pro). However, the EP directive on copyright and its Polish implementation says otherwise (Article 51 (3)), according to which these Microsoft provisions are unlawful.

So when buying the system at, for example, this auction: (http://allegro.pl/microsoft-windows-10-pro-pl-microsoft-partner-coa-i6775066860.html), will it be legal? I will have a key on the invoice so "some" guarantee that this one was not installed on a computer other than mine.

There is no this at the auction but CoA, the sticker added to this key is removed from Dell and Toshiba computers and I have a computer I have made myself. In this case, does it come under the EEA directive?

The key on the invoice for me is not a guarantee that the system is legal. According to Microsoft, it will still be illegal, which does not mean that you will feel it somehow.
They have drawn this partnership with Microsoft, probably in this "saving" documentation. If you have any doubts about this, you can always ask Microsoft, they will answer you that they do not trade keys, and certainly not at such a price and in this form.
I am not a lawyer, so I do not know how European Union law relates to it, which is quite extensive. Probably, if you have an invoice to buy a license, no one will prove you illegal. The question is, will it not stop the equipment if in doubt. It's hard to define. You might as well print the invoice about the purchase of the system from Mr. Fred and take the invoice data from the net (rather a very risky play, because the penalty for forging invoices is several years in prison, but I gave an example, deserving of a Darwin award, but different things do).

Because regarding Microsoft support or the installation of the system, there are rather no problems, even with clever codes for PLN 100, bought on various websites that offer them.

Please remove the topic and it adds nothing and I have already bought a completely new one. I can't risk it and the law is quite confusing, I don't have time to delve into it. To a complex computer with apricots, I bought a system for PLN 300 with stickers and a carrier. I will be sure it is 100% legal. Regards.