Here is my theory on why BF uses a DM.I think BF use the DM to help stop people from downlaoding and playing a game multiple times. The old way you can re-downlaod the same game and then play it again if you do it right, otherwise, it will just show up that you free trial version has expired. But, with the DM, it knows if you've downloaded it or not becuase games you've already downloaded (even if expired) stay part of the manager. Again, just a theory.