You use the free upgrade on your old computer. That gives you a Windows 10 license for the old computer which is valid for the life of that old computer. You can clean install it as many times as you want on the old computer. (Such as hard drive replacement or hard drive upgrade). Now, 1 1/2 years from now you build a new computer and you purchase a Windows 10 retail license for it. Now what do you have? You have your old computer with a still valid license and you have a new computer with a license. All you did by buying your license today is cheated yourself out of the free license you would have gotten from MS. Your initial post is pretty much babble.
Back in the day, I purchased a special Windows 8 upgrade from the Navy Exchange that was good for three computers - with only one key. I upgraded 3 computers with it and then upgraded those to Windows 10 for free. Now I have three licenses for Windows 10 that are good for as many times as I want to install it for the life of and on those computers.
Is this why my friend and me have the same CD-Key when we upgraded?
Literally, it's the same.
Lets start with looks like windows 10...well that would imply that it's still windows 8 or 7....So you think I don't have DX 12 that's cute, I hope you keep thinking that when you realise many features in Windows 10 simply could never work in windows 8 let alone windows 7 as they simply don't have the back end coding to support them.
The limited rights you refer to are to do with upgrade rights, The windows 10 we install is free to transfer to another PC providing we do it within in the upgrade year and preinstall windows 7-8 then install windows 10 upgrade then clean install windows 10 on top of that making it a clean install on a valid licence key.
I think it's pretty obvious we will have to buy a new copy of windows 10 outside of that upgrade year if we want to upgrade our PC's. Seems like a really obvious thing to do given the major changes coming to the PC industry over the next few years that will mean everything we think is great now will look like crap in a few years.
I expect better on this forum.
That is why most Windows 10 upgrades will have the same license key - it isn't really used for activation - it's just there to fill a legacy spot. The Hardware ID has replaced the license keys for activation. And that is also why Windows 10 will activate even on a computer where the user isn't using a Microsoft user account - it's tied to the computer hardware ID, not an account.
The only people who will have issues are those that want to move their license from one computer to another because the hardware ID will be different. But Microsoft has made that pretty simple too. You call them, enter in the code that Windows gives you for activation, answer a recorded voice prompt that your windows (or office) license is installed on only computer, and it activates with the new hardware ID generated from the new computer.