>>96320427
nta, the original unhelpful and retarded replier. Expanding on what I said here
>>96320222

Sanitizing a test pdf left me with only
>xmpMM:DocumentID
>xmpMM:InstanceID
metadata, with different values for the uuids, running it through privmeta then added some blank/fake meta data such as a creation date of 1970 and again changed the uuids. Since sanitizing allegedly removes hidden layers, embedded files and JavaScript I believe that would only leave watermarks which you'd have to find yourself looking at each page, but again, brief look down the rabbit hole.

I did also look into a plebbit post about hashes hidden inside meta data and using ExifTool to strip the hash then linearize it with QPDF but it seemed like overkill outside of sharing libgen scientific materials