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Watermarked PDF

Punkty: 150
Rozwiązań: 36

I bought an issue of PoC||GTFO magazine. My colleague also did so, but we realized that our files' size differ by few bytes. Most probably these are somehow watermarked. We've also found a license testing endpoint which works for these PDFs. Could you craft a PDF licensed to a doggy dog?

Format flagi: ecsc{litery_cyfry_i_znaki_specjalne}.

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