Ключевые слова: air, aircraft, anti, area, aviation, background, ban, camera, caution, communication, compound, concept, conceptual, control, danger, design, drone, drone free, fence, flight, fly, forbidden, icon, information, keeping people safe, law, message, no, no drone zone, no drones, no fly, notice, outdoor, policy, prohibit, prohibited, prohibition, red, restricted, safety, security, sign, stop, surveillance, symbol, technology, text, travel, warning, zone,