Ключевые слова: 3d, advertising, alertness, brother, camera, connection, control, crime, electronics, emergency, eye, guard, horizontal, image, indoor, instrument, lens, looking, monitor, network, no people, observe, office, online, optical, outside, police, power, privacy, private, property, protection, record, safe, safety, screen, secrecy, security, skyscraper, spy, surveillance, system, target, tech, television, thief, video, watching,