toxicTom: I have the boxed US version of Black Mirror, that now is utterly unusable since it tries to install some horrible copy protection (StarForce) that is not compatible with 64 bit or Vista or higher. I think it needed 3 (!) fucking serial numbers.
As a curious side note: The game is rated M in the US and 12+ in Germany (PEGI 16+).
Even the German boxed version did have this copy protection. You have to reboot the PC, enter a serial AND have the CD inside to let the game check. I wonder why it is not taking a blood test. Anyway - it does not work on WinXP either (maybe it needed comp. mode but I tried that and the copy protection told me to turn off th ecomp. mode - ARGH).
So I bought all three games in a sale on Steam including German audio for <10 Euro all DRM-free. If I had the opportunity to buy them all on GOG I would have done that but I did not want to wait any longer and in this case as I said the games were DRM-freem, too.