and they weigh close to nothing since they're just stored data… super duper ultralight.
http://www.wired.com/2015/02/white-house-drone/
"With all the attention surrounding the White House landing, DJI felt it had to take action. So last Thursday it pushed a “mandatory firmware update” for its Phantom 2 that would prevent the drone from flying in a 15.5 mile radius of the White House. So far it’s the only drone-maker installing what’s known as GPS geofencing
The technique is not new to DJI. The company first added no-fly zones to its firmware in April of last year to deter newbie pilots from zipping into the restricted airspace over airports, where they might interfere with departing and arriving aircraft"
