Ensuring transport safety and security is one of the EU’s main priorities, as spotlighted in WHITE PAPER–Roadmap to a Single European Transport Area, which sets out a strategy leading to reach a safer, more efficient and more sustainable civil road, rail, air and waterborne transport. Drone applications are considered as potentially capable of revolutionizing the world around us. Nevertheless, security issues make impossible to fly drones in most situations, due to drone guidance and control-related technologies have not reached enough readiness level to guarantee safe operations in most of low altitude scenarios. To face these issues, SESAR has created U-SPACE, a new framework designed to integrate safely, securely and efficiently drone operations at low level into EU airspace. Active geofencing is one of the main drone emerging technologies outlined in the U-Space Blueprint. However, although geofencing is a useful technology to avoid drones presence in restricted places, it is not prepared to face the