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In this tutorial, Kumar demonstrates how to encrypt a PDF file using DocHub Pro. You need to have DocHub Pro installed on your system. Open the PDF file in DocHub Pro, go to file properties, and select password security. You can set a password for the document to require to open, as well as restrictions for printing, copying, and making changes. Make sure to also set a password for these restrictions if desired. This will ensure your PDF file is secure and protected.