The music industry is already facing the backlash of users who bought DRM - loaded tracks that can not be played anymore because activation servers are no longer... active. (news.softpedia.com)
If you're «genuine» (that is, properly activated), the Windows activation server generates a Windows 10 license certificate (Microsoft calls it a «digital entitlement») and stores it in conjunction with your installation ID and the version you just activated (Home or Pro). (zdnet.com)
That's because the activation for the free offer of Windows 10 is registered on the Microsoft activation servers for the PC when you upgrade Windows 8.1 or Windows 7. (thewindowsclub.com)