DayZ is a mod for the ARMA 2/OA game. That game is made by Bohemia Interactive, the same company which employed Dean "Rocket" Hall. This "free" mod is made by someone who works for Bohemia Interactive and every copy of ARMA 2/OA that is sold puts money in Rocket's pocket. To say that the mod is free is just retarded when you are just giving money to Rocket, the developer of this mod. Edit: Don't even try and say that you bought ARMA 2/OA for ARMA 2 and not for DayZ. No one in the right mind would buy this train wreck of a game if it wasn't for DayZ.