Ключевые слова: behind the scenes, blackboard, book, chalk, chalkboard, classification, classified, concept, conceptual, confidence, confidential, confidentiality, definition, dictionary, document, esoteric, ethical, ethics, forbidden, frame, hushed, hushhush, ideas, important, inside, intimacy, intimate, nonpublic, off the record, page, paper, principle, privacy, private, privy, protection, secrecy, secret, secretive, security, symbol, text, textbook, top secret, trust, whispering, white chalk, word,