Ключевые слова: abstract, access, background, black, blackboard, border, business, chalk, chalkboard, code, communication, concept, copy space, data, element, equipment, frame, icon, information, internet, isolated, key, lock, network, online, open, padlock, password, privacy, private, protection, safe, safeguard, safety, secure, security, service, shape, sign, solution, storage, symbol, system, technology, text, unlock, white, wood, word, work,