I think you're right. You can always sell your PC and that includes the license (and for OEMs, Microsoft ties that license to the hardware; typically the UEFI serial or the CPU ID). That can technically be enforced at the hardware level.
But before they did that, you could peel off your case serial number, install Win XP on another machine and sell your old one blank. Is this violating your license? I'm honestly not sure, but we did it all the time.
Also if we didn't have an XP key, we'd often go to Staples and write them down off the store units.
But before they did that, you could peel off your case serial number, install Win XP on another machine and sell your old one blank. Is this violating your license? I'm honestly not sure, but we did it all the time.
Also if we didn't have an XP key, we'd often go to Staples and write them down off the store units.