Ключевые слова: 3, abstract, advertisement, agent, arm, artwork, closed, code, collage, composite, confidential, contemporary, creative, data, design, documentation, effect, envelope, exchange, files, graphics, hand, hidden, hold, illustration, important, inaccessible, info, information, keyhole, letter, lock, material, message, metaphor, montage, mystery, offer, paper, password, private, riddle, safety, sealed, secret, spy, transfer, trend, visual, wrist,