Windows 7 COA licence key from ebay

I have a windows XP dell pc on which I've installed Windows 7 professional.

I would like to buy the cheapest legal licence available and have found these two on ebay:

Dell OEM:

Intended for distribution with a refurbished PC:

My questions:
1. Are either of these types legal for my scenario?
2. What is the difference between the 'OEM' and the 'Intended for distribution...' one?
3. If OEM is only desinged to be activated on one system (identied by the motherboard) and the OEM key is from a decommissioned PC (i.e its already been activated once), how is it going to activate again on my system - in practial terms and legal terms?
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Brian KirschCommented:
OEM licenses live and die with the machine they are attached too.  It is not legal to "move" and OEM to another machine.  While you may replace internal pieces in the case you cannot move the "sticker" to another machine.

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JohnBusiness Consultant (Owner)Commented:
You can purchase Microsoft Windows 7 OEM from Software King. I have purchased from them before.

You can purchase an OEM license (not a vendor OEM license), use it on your machine and then it is tied to that machine.
leo135Author Commented:
Thanks Brian

What about the second link?
Active Protection takes the fight to cryptojacking

While there were several headline-grabbing ransomware attacks during in 2017, another big threat started appearing at the same time that didn’t get the same coverage – illicit cryptomining.

Brian KirschCommented:
I would not purchase from that site, Microsoft terms are very clear regarding OEM licenses.
JohnBusiness Consultant (Owner)Commented:
I have purchased OEM packages from full Microsoft Partner vendors. So long as you install it on your own machine and keep it there, you should be fine. The key is that you can't move or reinstall the license.
leo135Author Commented:
Thanks for clarifying regarding the OEM licence.

The second link is not an OEM licence. It seems to be another sort of licence with 'Intended for distribution with a refurbished PC' written on the disc. Could you explain what this is?
Brian KirschCommented:
You are suppose to be a OEM system builder to use a OEM license,

Considering the fines from the BSA that can start over 100k per violation I prefer not to risk it.
I agree with Brian.  You're only way to go is to buy retail  license.
It depends on where you live. At least from your links you are in the UK, and the UK belongs to the EU. In the EU and closely linked countries like Switzerland, you can move OEM versions of Windows 7 to another PC, at least if they are unbranded OEM versions. You just have use the activation by phone routine.

In all other countries m$ won't reactivate an OEM version of Windows if you move it to another PC or change the mainboard to another model.

You can never be sure when you buy software from online sellers whether they are legitimate or not, it is always your risk.
David Johnson, CD, MVPOwnerCommented:
Microsoft also has System Builder (think it was retired) and the System Refurbisher program. These keys are not supposed to be sold via the internet you are 'Supposed' to refurbish a pc and then sell it as a complete package.
leo135Author Commented:
I'm sorry guys, I'm still not 100% certain based on your answers.
Is something like this legal (in the UK):

Its from Microsoft Authorized Refurbisher (MAR) program. Is it allowed to sold separately with a PC?
David Johnson, CD, MVPOwnerCommented:
Technically not legal, will it work probably.  The seller is violating his agreement with Microsoft.
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