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In this tutorial, Kumar from technology support explains how to encrypt a PDF file using Adobe Acrobat Pro. First, ensure you have Adobe Acrobat Pro installed on your system. Open the PDF file in Adobe Acrobat Pro, then go to file properties and select password security. Here, you can set a password for the document and apply restrictions such as printing, copying, and changes. Once the password is set, the document will require a password to open.
