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It depends what kind of edits you’re aiming for and what your setup is.
I have opted to go all-in and run Stirling pdf, which is a server solution and then you can do a shitload of things via web browser.
If quick and dirty is fine than inkscape is a surprise candidate - although it’s aimed at vector graphics editing you can easily create overlays for PDFs as well.
Both langchain as well as ollama run locally and are open source.
To be very frank: your post sounds like fear mongering without having even clicked on the link.