The latest decade witness an unprecedented development of the Unmanned Aerial Vehicles (UAV), as well as for the infrastructure necessary to integrate these items into the societal life. There are several millions of UAVs ranging from large size for military applications, to small dimensions used for commercial purpose and all of them are waiting for the moment when our society would be able to integrate them in a controlled manner in our life. This chapter presents several possible technologies to unique identify the UAVs and thus to create the proper environment for proper register and monitor them.