I tried to change the desktop background on my wife's netbook, failingly. Googling for some help, I found this. Who would've thought, that changing the desktop background could break the license?
On a related note, I'm buying a new PC for myself. Or, more precisely, I'm buying a heap of parts, which, when properly combined, will be my new machine. Back in the olden days that would've qualified me for OEM discounted Windows. Not anymore. Since none of the Steam catalog is available for linux, I guess I just pay the retail. I'm mildly peeved. Well, it's not a huge sum, but I don't like my privileges taken away.