What people in this thread who think that this means they can copy "their" software as much as they want can't seem to get through their head is the idea of "Intellectual Property" vs owning a COPY of software.
Yes, according to this ruling, if you buy Windows 7, and later down the road you decide to sell it to your homeslice Giancarlo because you're l33tsauce and moved over the some obscure linux distro, then you are ok to do so, at least according to the precedence this case sets.
You do not, on the other hand, own the actual code on the disk. You own the copy of the code and use of that copy of the code. All this means is that they can't put restrictions on the software like MS does with say OEM versions of the OS vs Retail. Where they say "you can only install this on one computer, and if you ever replace that computer, you have to buy another "license" of the software."
Companies are still perfectly within their rights to put registrations codes and cdkeys, etc, that limit and ensure you're only using the software once.