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Kumar, a technology support aid, demonstrates how to encrypt a PDF file using docHub Pro. To begin, ensure you have docHub Pro installed on your system. Open the PDF file in docHub Pro, then go to file properties and select password security. Set a password for the document to require it each time the file is opened. Restrictions for printing, changes, and copying can also be set using the same password. An example is given, showing how to set a password for opening the PDF file.