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In this tutorial, the speaker demonstrates how to use VBA to encrypt PDF files. Before starting, download the encrypt PDF.exe file, a command line tool created using Python for this purpose. The Excel spreadsheet contains file paths and passwords for the PDF files. Backing up the files is recommended before running the macro. To access the VBA window, open the Visual Basic tab in Excel. Create a new module and declare variables for file names and row numbers. Reference the worksheet as "ws" and proceed with the encryption macro.