[snowpanda]

Does only Crossref do this?

I'm asking because a friend of mine who's enrolled in 2 colleges, just downloaded the same scholarly PDF (one that's also available through sci-hub) with 2 different college credentials and they had the same sha256sum.

Then when he tried it through sci-hub, he also got the same sha256sum.

[afandian]

Crossref doesn't do anything at all in relation to SciHub or watermarking PDFs. We don't host content. (I'm happy to talk about what we do do, but it's off-topic)

Sorry if my disclaimer wasn't clear. I was just pointing out affiliation as standard on HN.