Nay to DRM!
When my old mother (cue violins) got a new laptop to replace her ancient, irreparably busted PC, do you think her favourite DOS game would run on XP?
Of course not.
Not because of the game itself (the demo version worked), but because of the fscking CD copy-protection.
I certainly learned my lesson and haven't shelled out for any copy-protected SW for my PC, or my mum's, since.