https://www.compdf.com/blog/flatten-pdfs-in-objective-c
How to Flatten PDFs in Objective-C | ComPDF
Flattening makes annotations become part of the document content and cannot be edited. It enables file security, sharing, printing, etc.
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https://updf.com/mac/flatten-pdf-mac/
How to Flatten PDFs on Mac? - The Ultimate Guide | UPDF
Need a simple way to flatten PDFs on Mac? Here, we will introduce the effective methods to you to flatten PDFs on Mac easily.
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