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In this tutorial, Kumar demonstrates how to encrypt a PDF file using DocHub Pro. To do this, you need to have DocHub Pro installed on your system and open the file in Adobe Acrobat Pro. Once the file is open, go to file properties and select password security. You can then set a password for the PDF file and add restrictions for printing, changes, and copying. Make sure to set a password for the restrictions as well. This will require a password to open the PDF file and apply any specified restrictions.