DRM will be this (unless Stardock changes policy)
You activate it online on install- and patches require serial verification. Activation will be manual is done via website, automatic if done with Stardock Central (or Impulse/Steam).
You can activate on any many machines as you wish.
No DRM on launching the game itself.
If you buy a Stardock game via disk (though this is download only)- there is no activation for install.
My opinion on this policy: it's perfectly fair. If you're buying online, you're online, and an online activation (which takes like 1-2 seconds) is perfectly reasonable. Patches make sense also, especially since Stardock's patch quality (Stardock patches have traditionally heavily improved their games) is part of how they protect their IP. DRM is annoying when it's on launch, and Stardock doesn't do that.
One thing I did notice, I clicked to look on the price, and it said I get the game free (since I bought in 2010). That's good, but there seemed to be no way (I had no intention to, but others might) to buy the game for someone else as of yet. That might need to be fixed, or that might be a problem that I think someone else will have, but they don't.