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Hello everyone! In this tutorial, I will show you how to encrypt a PDF file using Adobe Acrobat Pro. First, make sure you have Adobe Acrobat Pro installed on your system. Open the PDF file in Adobe Acrobat Pro, go to File, then Properties, and select Password Security. Here, you can set a password for the document to require it to open. You can also set restrictions for printing, changes, and copying. Make sure to enter the password for these restrictions as well.