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A comment on Elsevier embeds a hash in the PDF metadata that is unique for each download. Parent comment

Re:Elsevier embeds a hash in the PDF metadata that is unique... by NKosmatos on Wednesday January 26, 2022 @07:20AM (#30084634)
The tweet author also mentions these tools than can help in cleaning PDFs: exiftool: https://exiftool.org qpdf: https://qpdf.sourceforge.io dangerzone (GUI, render PDF as images, then re-OCR everything): https://dangerzone.rocks mat2 (render PDF as images, don't OCR): https://0xacab.org/jvoisin/mat2
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