Why? Why is this a thing? Oh noes, piracy! It's the reason why we have to have such a draconian protection system in place. Please.
Quality games get lots of cash, even when massively pirated. Look at any of the GTA games. GTAV alone made $800 million and is in the Guinness Book of Records for breaking six different records. It was also one of the more popular games to pirate.
Look, everyone that makes something legitimate hates pirates for stealing their stuff. I understand it. But all you're doing is punishing those who bought your game with this system that doesn't allow them to play offline. Does your server go offline? Tough shit, you're not playing the game you bought. It's ridiculous. You're not going to stop pirates from pirating a game. They'll always figure a way to do it. Instead of trying to crack down on it, try figuring out a way that's beneficial for them to buy the game. Take a look at Batman: Arkham Asylum for an awesome idea.
At least Steam and Origin allow you to play a game offline should you lose your internet connection or their servers fail to load.