Kimmo Huosionmaa Have you ever hear term "grey project"? This term means that in some aircraft or some other project the information, what is given is selective, and in those cases the project itself is public. But many important things in it would be hidden from the public. Almost all drone projects are that kind of military projects. The robot itself is seen in the pictures, but the materials, computer programs and electronic components of this drone have kept classified. Also, important parts of the drones or aircraft motors are kept in secret. And if somebody makes copies of that aircraft, this actor doesn't actually make anything about it. If those systems are made by using the wrong components, the aircraft or other equipment would be destroyed immediately, when it goes to the battlefield. Many of space probes are actually so-called "grey projects". The probes like Mars-cars or planet orbiting probes are very public, and we can see the pictures...