Ключевые слова: alarm, architecture, background, big brother, building, business, cam, camera, circuit, city, control, electrical, electronic, equipment, exterior, guard, industry, lens, monitoring, office, old, optical, outdoors, privacy, private, protect, protection, record, safe, safety, secrecy, secure, security, shadowing, spy, stair, staircase, street, surveillance, system, technology, television, urban, videcam, video, view, visual, wall, watching,