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This video tutorial demonstrates how to encrypt a PDF document using Nuance Power PDF. If you don't have the software, you can install it using the Oxford installer program or contact your IT department for a free copy. To encrypt a PDF, open the document, click on security in the prepare section, go to settings, and modify the security method to password security. Set the compatibility to AES-256 encryption and allow document opening only by password. Enter a strong password of at least 12 characters, confirm it, and save the changes.