Ключевые слова: abstract, arcanum, background, banner, blackboard, blank, board, chalk, chalkboard, confidence, confidential, design, frame, hook, icon, iron, key, label, lock, lockstitch, metal, object, open, pad, padlock, pattern, protection, reflection, safe, safety, secret, secure, security, shackle, shining, shiny, sign, steal, steel, striped, stronghold, symbol, tag, texture, top, undercover, unlock, white,