"Moderate" copy protection to stop casual pirates is trivial - game companies have been making uncopyable CDs for nearly as long as they have been publishing games on CD. This is already very effective against casual copying.

Current copy protection systems go much, much further than that. They're not trying to stop casual copying any longer, they're trying to stop all kinds of internet piracy. This is doomed to fail, and in the process they are creating immense troubles for their legitimate users.