This whole thing got me curious so I decided to take look at the guts of one of the most recent pdfs I could get my hands at (Ernisch's 465) to check about our options.
Despite the pdf having an AES 128 protecting it, the password is obviously a blank since we can open preview its contents at all. This allows trivial decryption.
So I wrote a small and dirty POC in bash that does just that and then immediately tries to strip everything xmp it can, tags and metadata, before outputting the finalized pdf.
I used exifinfo, pdfinfo, qpdf and pdftk as tools in a Unix evironment and I'm attaching a zip of the bash.
It might be ported to windows if it proves to be efective, so I'm uploading the cleaned comic in clear to my MEGA acc and I'm placing my bets in that if the file name and the hash have both been changed, then MEGA won't be able to comply with the DCMA unless there happens to STILL be means of tracking the file (pixel tracking for instance).
MEGA to the cleaned comic:
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