Where in the BIOS does MS store the Win10 key

I have had my BIOS locked with a password ever since I started testing Windows 10 Builds.
I have not had to enter the password and have updated to the latest CB build. How does MS do this?
or if it can do this How?
I run a ASUS P9X79 LE motherboard.

This is not new. Bios embedded keys were introduced in Window 8. They are hard coded into the bios (like a permanent ROM) and even a bios firmware update would not affect it.

I run a ASUS P9X79 LE motherboard.

You do not have a Windows key in your BIOS. Only OEM boards have that.

MS does not update BIOS with a Win10 key.
The "Win10 license" is saved on a Microsoft Activation Server, for that PC/device.

Here are some tutorials that might help:
Activate Windows 10 - Windows 10 blog
Activation of Windows 10 - Check - Windows 10 blog

MS does not update BIOS with a Win10 key.
The "Win10 license" is saved on a Microsoft Activation Server, for that PC/device.

Thanks for the info.
So what is it that MS uses to differentiate one VM from another?

Thanks for the info.
So what is it that MS uses to differentiate one VM from another?

There are various details about a hardware computer or virtual machine that are unique and can uniquely identify it. I doubt that the details have been published.

As far as i know each unique VM would be considered a "different device" on the MS Activation Server.
Others may know for sure, and correct me if i'm wrong.

As far as i know each unique VM would be considered a "different device" on the MS Activation Server.
Others may know for sure, and correct me if i'm wrong.

You are exactly correct.

Hi,

This is not new. Bios embedded keys were introduced in Window 8. They are hard coded into the bios (like a permanent ROM) and even a bios firmware update would not affect it.

Vista actually.

Cheers,

That's news to me.
Win 7 and earlier use a COA sticker for the license.
Win 8 and later don't have a COA sticker, and use the key in the bios.