It was the starforce protection that took years to be cracked(but still worked due to alcohol)and Microsoft's new product activation technology didn't even last a month.A group called Razor1911 has come up with a crack for Microsoft's Halo 2 product activation.The crack,as the info i received said,allows players to even play online.However it won't be long before Microsoft comes up with some banning techniques.Also u do not need an activation key to play online.