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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 snovv_crash on Wednesday January 26, 2022 @08:42AM (#30085226)
Randomly choose 3 big paragraphs in the entire ebook to add an extra newline in the middle of at the end of a random sentence. This would be my choice if I had to do some kind of invisible watermarking, at least.
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Re:Elsevier embeds a hash in the PDF metadata that is unique... by hdjjhhvvhga on Wednesday January 26, 2022 @08:55AM (#30085378)
This is one of the many things that could be trivially detected and fixed when you have multiple watermarked copies of the same file.
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