More fun publisher surveillance:
Elsevier embeds a hash in the PDF metadata that is *unique for each time a PDF is downloaded*, this is a diff between metadata from two of the same paper. Combined with access timestamps, they can uniquely identify the source of any shared PDFs.

@jonny this is the same technique that was being used in the OS designed in North Korea called Red Star OS. It was in the Chaos Congress talk about it.

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social.coop

A Fediverse instance for people interested in cooperative and collective projects.