Ключевые слова: background, chain, chain lock, close, closed, computer, concept, cyber, danger, defense, door, door lock, entrance, escape, estate, gate, guard, hand, heart, heart shape, home, house, iron, key, lock, lock bunch, locked, locker, locking, locksmith, love, lovers, many, metal, metal lock, object, padlock, privacy, protect, protection, safe, safety, secure, security, symbol,