How to remove 'anti-piracy' footers from complex PDFs? - sh.itjust.works

I have some sewing patterns that I would like to share (and hopefully swap) but all of the PDFs have a >“This was purchased by John Doe [email protected] [[email protected]] #ordernumber - if you are not John Doe, please dob in the person you got this from to [email protected] [[email protected]] so we can sick our lawyers on them” sorta footer on every single page. Obviously for privacy reasons (and because I don’t actually want lawyers sicked onto me), I need to remove this footer. These are often complex PDFs with more than a hundred pages and multiple layers. I managed to successfully remove the editing password (not user/viewing password, just can’t edit without password) with qpdf --decrypt. But removing that footer has left me at a dead end. I have even tried manually removing every single instance of those footers using Master PDF Editor but saving the file flattened it and you are no longer able to show/hide layers which is essential for correct printing. (Please don’t ask me how many different PDF editors I have tried because it has been so so SO many I have lost count). Not that I really want to have to manually edit this out on what could amount to over a thousand pages but searching for a command to remove a certain phrase has come up empty. Even Master PDF Editor doesn’t seem to have a bulk remove or search and replace function (just search). I use Linux btw.