[citation][nom]nottheking[/nom]Uh, serial numbers didn't stop StarCraft II from being pirated 2.3 million times in 90 days. All the serial numbers really do is raise piracy concerns for the legit buyers. That's more or less the same problem with any DRM, in that it doesn't stop piracy, and only burdens the legitimate buyers. Pirated copies just have a hack to disable that check, just like games of old had hacks to disable the game checking for the CD.[/citation]
True, however, if done right then it could eliminate. By done right take a look at Guild Wars. Yes it is an MMO, but the base concept can work for solo games.
Install game, log into account, add key to account, play. No login, no play.
Oh wait, steam works more or less like that...
There are no excuses for piracy, I have pirated games in the past (I now have the legal copies of all of them), but after having major issues and then after patching to try and find a crack for latest version (then finding there isn't one yet), just became more effort than it was worth. Now I buy my games (mostly on Steam now) and I don't have issues with patches and cracks. It is a choice each one has to make for him/her self.