I read the licensing terms and you are still allowed to install the one copy you buy across as many computers as you own (for personal use). For business use you can install it on one computer that multiple users have access to (e.g. a shared workstation/library) or you can install it on all the computers that one employee uses (e.g. desktop + laptop).

So I guess it's more of a technical/sign-in limitation than a licensing limitation.