Ключевые слова: 3d, access, background, business, close, closed, code, computer, concept, data, design, door, element, encryption, guard, icon, illustration, internet, isolated, key, keyhole, lock, locker, metal, object, open, padlock, password, privacy, private, protect, protection, realistic, render, safe, safeguard, safety, secret, secure, security, shape, sign, simple, steel, symbol, system, technology, unlock, web, white, yellow,