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In this tutorial, Kumar demonstrates how to encrypt a PDF file using Adobe Acrobat Pro. To do this, you need to install Adobe Acrobat Pro on your system and open the PDF file you want to encrypt. By going to file properties and selecting password security, you can set a password for the document to prevent unauthorized access. Additionally, you can impose restrictions on printing, changes, and copying. By entering a password to enable these restrictions, you can ensure the security of your PDF file.