Recent documents revealed by Edward Snowden show that the US NSA and the UK Secret Service (GCHQ) have violated the UAV (drones) Israeli airborne feeds.
Like most military aircraft these days, drones are equipped with videocameras. These cameras are used for recording material but also for remote control of the aircraft.
The data collected by the aircraft cameras are coded and sent to satellites. They are then transferred to military bases or other special ground stations.
According to documents leaked by Snowden, the US and United Kingdom they had created such a ground station in the Troodos location in Cyprus, in 1998, especially to collect the videos from the Israeli drones.
The secrets services of the US and UK started by using a wide net to eavesdrop on the video feeds, but eventually narrowed the scope when they discovered the individual frequency of each drone. The technique is similar to what one uses to listen to her radio frequencies polices.
1997, however, Israel has discovered that Hezbollah managed to kill 12's commanders after he passed the feeds without encryption by a drone. Since then, Israel has reportedly implemented encryption for all drone video feeds.
This did not prevent US and UK agents, who 2008 discovered that by intercepting periodic snapshots of encrypted video feeds, they could use a C library called AntiSky to decode the aircraft's camera record.
Edward Snowden's revelations and the leaked NSA documents exist at TheIntercept.
