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Since Windows 10 (or earlier?). It has become standard to store the license product key in the UEFI/BIOS.

I am in the market for buying a new (custom build, individual parts) PC with a new Windows 10 License.

However I was wondering (and can't find clear information on this subject). What the differences between the licenses are when it comes to OEM and Retail.

If in the far future I were to sell this PC:

  1. Would the license (whether OEM or Retail), be stored in the UEFI/BIOS, where it could be used by the new owner?
  2. If so, can I remove the license key from the UEFI/BIOS?

I want to know this because I don't want to buy Windows 10 every single time I buy a new PC (since no new versions of Windows will be created, only updates).

JSmith
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4 Answers4

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I have an oem license from Microsoft. Not the oem end-user but an OEM hardware manufacturers license. This is what I did.

Right click the desktop and go through your settings and set your computer as a developer.
You will need an IDE. Visual Studio Community is free. Download and install the Software development Kit (SDK) and the Windows Assessment and Deployment Kit (ADK).

You are a Computer manufacturer and your company name is [whatever] mine was Used-Parts Custom Computers and Tailor Made Winstallations.

The process of making (or learning about making or deploying) a branded Custom Windows for your own Company that makes a hardware device requires you to be an OEM. This is the workaround as recommended by Microsoft in their ADK tutorial Creating a Custom Windows for Deployment tutorial at msdn (i think). Whether it's limited in duration or scope, or or not, doesn't matter. You now have an OEM license that passes the Microsoft screening.

As to whether you can access the table to alter or edit the Product key? I just found out about the product key in the eufi, we'll have to wait and see. I will follow up. The key is injected at the mfg not in Redmond so I'm thinking the mfg gets a tool. I will ask for one. But the oem should be based on GUID. if you add, remove, or replace any hardware device that is in the GUID, the computer will get a new GUId. This probably only applies to people who want to escape their OEM product key. I think the sound card, graphics card and network card and processor make up the guid. Just change one of them for a new number and you should be able to escape out of the OEM label.

If you want to "add" to the uefi to escape having to put in the key every time you install Windows, just make a system image of your windows and designate a hdd as a Backup location. Make the image after all the updates, drivers, and software have been installed. Making a second one at a network location is a good idea also. This will automate the entire installation. A send option is You can edit the wim file and stream in your product key. I think the file name is install.wim? not sure. I've heard of it but never tried. Third option is to make a deployment using an answer file. Basically the installation refers to a file that you prepare that holds all the information the Windows install needs. You can include other stuff as part of the install. The answer key is where you add the product key.

S1Niz7el2
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3

Windows doesn’t embed the key, the OEM has to do that. I guess a built-to-order PC won’t have a key embedded. It’s unlikely a hardware shop has the tools required to do it.

Simply put: If there isn’t a key now, there still won’t be one after installing whatever Windows version you procure.

As for the second question: You can’t remove it. The ACPI tables (location of key) are provided within the (UEFI) firmware which you cannot update yourself.

user219095
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OEM licences live and die on the machine that they were installed on by the manufacturer. If you were to sell the machine then the licence goes with it.

Retail licences are yours. You can uninstall (format) the machine it was on and move it to another machine.

To clarify though, OEM licences were stored in UEFI/BIOS, but now you have "digital entitlement" where your licence is stored online with Microsoft along with a hash of the details of the machine hardware.

Mokubai
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An OEM / System Builder License can be purchased but you cannot write the product key to the UEFI. The biggest difference is the support you would receive.

TroyPilewski
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