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Welcome back to the Real Python course on working with PDFs in Python. In part 5, you will learn how to add a watermark and encrypt PDFs. A watermark is an identifying image or pattern on documents. Watermarking is important for protecting intellectual property. You can use PyPDF2 to add a watermark to a PDF file by importing PDF file writer and reader from PyPDF2, defining a function to create the watermark, and applying it to the PDF document.
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