This Has Been around For a while but not alot of people know about it..
All the following DLC is DRM - Free ..
This allows you to just to download and put on your harddrive or usb stick and still be able to use...
Not all dlc is like this..
You can do this with a usb stick over 1gb

------------FALLOUT 3-------------

Mothership Zeta...........
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Operation Anchorage.......
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The Pitt..................
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Broken Steel..............
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Point Lookout.............
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*All FAllout 3 Dlc is to Put in folders On your USb Stick Or Hard drive Under...
Content000000000000000425307D50000002

----------BorderLands DLC-----------

Mad Moxxi's Underdome Riot...........
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The Zombie Island Of Dr Ned..........
(download all parts before extracting)
part 1- [ Register or Signin to view external links. ]
part 2- [ Register or Signin to view external links. ]
part 3- [ Register or Signin to view external links. ]

*All BorderLands DLC is to Put in folders On your USb Stick Or Hard drive Under...
Content000000000000000545407E70000002

----------Oblivion DLC-----------

Shivering Isles...........
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Knights Of The Nine.......
(download all parts before extracting)
part 1- [ Register or Signin to view external links. ]
part 2- [ Register or Signin to view external links. ]

*All Oblivion DLC is to Put in folders On your USb Stick Or Hard drive Under...
Content000000000000000425307D10000002

----------Mass Effect DLC-----------

Bring Down The Sky.........
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*All Mass Effect DLC is to Put in folders On your USb Stick Or Hard drive Under...
Content0000000000000004D5307E80000002


I tried this with the fallout 3 DLC and it's 100% Legit
If you have any questions PM me