Ключевые слова: access, archive, background, ban, book, business, chain, chrome, closed, concept, confidential, data, document, education, expertise, forbidden, guard, hardcover, identity, information, intellectual, intelligence, knowledge, law, learning, literature, lock, metal, mystery, padlock, privacy, protect, protection, read, reading, safe, safeguard, safety, secrecy, secret, secure, security, single, steel, strength, study, studying, symbol, textbook, wisdom,