If you work with PDFs in, you will at some point want to know how to add or remove a watermark in Acrobat. A watermark is an image or text added in front or behind the contents of a document.
You can't edit a PDF directly. You will need to open the PDF in Illustrator (whioch uses PDF as its native format, I believe) and then add the logo, and save as PDF. If you don't have the original ...
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