I never quite got how all this stuff was disc locked when the servers host the maps.
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The levels and all the objects in the game are on the disc or your console, that's why you have to download the updates when there's new content or changes. The server just keeps track of where the objects are located and everyone's health.
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All the maps and files for the game are either on the disc or downloaded in to your xbox/playstation. That's why you have to download updates when there's new content. The servers just keep track of where everything is located and what objects' status are. That's why when you lose connection the screen doesn't just black out; you'll shoot a few enemies or other players and it will have no affect on them, and then after a few seconds it will tell you your connection is lost.