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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 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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