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This video tutorial demonstrates how to encrypt a PDF document using Nuance Power PDF. If you do not have Nuance Power PDF, contact your local IT department for a free copy or use the Oxford installer program. To encrypt the PDF, go to security, click on prepare, then settings and modify the security method to password security. Set compatibility to strong AES-256 encryption and allow document opening only by password. Create a strong password of at least 12 characters, confirm it, and save the changes.