Elsevier embeds a hash in the PDF metadata that is unique for each download

Submitted ⁨⁨10⁩ ⁨months⁩ ago⁩ by ⁨bot@lemmy.smeargle.fans [bot]⁩ to ⁨hackernews@lemmy.smeargle.fans⁩

https://social.coop/@jonny/107685726645817029