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Hi, i tried your solution before saving the pdf, but it did not work. My exact requirement is that i want to make the annotation just like text so that if someone opens it in pdf reader and they won't be able to delete that annotation. Right now, if i save it and open it on laptop, i can remove the annotation but text i can not remove.
You can call Page.FlatAnnots -> this will make the annotations part of the page content and cannot be removed.
but it will flatten all the annotations contained in this page
This method requires the premium license.