This document has come to light after reports that insurgents in Iraq and Afghanistan have been intercepting video feeds from US Predator drones, or Unmanned Arial Vehicles (UAV). Not only can they capture and save images and videos but also any mission control data that is carried in the same stream. The video is compressed using an MPEG algorithm with the data embedded in the stream. Amazingly the transmission is not encrypted. Pure military genius!
Check out the pdf file.