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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 download it using the Oxford installer program. To encrypt the document, go to security, then prepare, click settings, and modify the security method to password security. Choose the compatibility setting for strong AES-256 encryption. Set to allow document opening only by password, enter a strong password, confirm it, and click OK. The document is now encrypted and can only be opened with the password.