Ключевые слова: access, background, business, communication, concept, confidentiality, correspondence, detail, document, document security, encryption, envelope, filing, financial, focus, letter, lock, locked, locked system, mail, mail security, message, metallic, office, organization, padlock, paperwork, prevention, privacy, professional, protected, protection, risk management, safe, safety, sealed, sealed envelope, secure, security, stack, storage, unopened, white,