Just for those that use Open Office and or need to Edit PDF files, below is an Extension Add-on that lets you Edit the files in Open Office Draw. Works like a charm and it's free. You'll need to have Open Office installed of course!
How to Edit PDF files in Open Office(2 posts)
From that link,
"Please notice: Use this extension cautiously as editing PDF files is not a trivial task. Encouraged by the huge number of positive comments and the improved quality of this extension, we decided to remove the Beta tag from this release. Of course we will continue to work on this extension to reflect user needs and any changes to the PDF standard. To further improve this extension, please continue sending us feedback at firstname.lastname@example.org."
Now would it work in Libre Office ?