New
#30
Once again, it doesn't say "key", it says "license". And what they mean by "consume" is that you cannot take that you cannot (legally) take that Windows 7 or 8.x disk and install it on another computer at the same time you are running Windows 10 that was upgraded from that license.
You are still free to go back to Windows 7/8.x if you delete your Windows 10 installation. In other words, the new license is tied to the old license. That doesn't mean the old license is invalid, just that it's either 7/8.x or 10, but not both.