

Two replies there that came to my attention, while I’m unable to get back to sleep at 5am. An old one mentioning https://github.com/kanzure/pdfparanoia which seems to be an old tool that removes watermarks, hasn’t been updated in 5 years, but neither has the PDF spec?
The other is this paste of text:
if it helps anyone, here’s what I do to prepare a pattern for uploading to make sure it is ‘clean’:
Check over the PDF files for any reference to my name/email address (usually this is in a footer on each page, and not every pattern company does this)
If my personal details are present, I unlock the files using a site like ILovePDF - There are other sites but this one has no daily limits
Open the unlocked PDF in Adobe Professional or another PDF editor of your choice and delete the footer box. You can just delete the box on the first page it appears, or the first page it is a standalone box, then save the pdf, close and reopen it - usually it will now be gone from all pages.
Repeat for any other PDF files (obviously)
Run PDF and jpeg files through an exif cleaner
Double check and upload.
The one that hits us in self hosted is https://auth.docker.io/