PDF Hub · 5 min read · Aug 10, 2026 · By PDF Hub Team
PDF Security Guide: Passwords, AES-256 Encryption & Redaction
How to protect sensitive contracts with AES-256 passwords, set owner permissions against printing or copying, and remove unneeded pages offline.
Legal contracts, financial statements, and medical records require strict access controls before distribution. Understanding PDF security algorithms helps you safeguard documents against unauthorized access.
User Passwords vs Owner Passwords
• **User Password (Open Permission)**: Requires the recipient to enter a password before viewing the document content.
• **Owner Password (Permissions Lock)**: Prevents recipients from printing, copying text, or editing pages even if they can view the file.
100% In-Browser Encryption
PolyForge PDF Hub encrypts your documents locally using AES-256 cryptographic standards. Your password and document content never leave your machine memory.