Major academic publishers, including Elsevier and Springer Nature, are trying to unmask the operators of several shadow libraries including Anna’s Archive, Z-Library and Libgen. They're also targeting SLUM, a third-party uptime monitor for these unofficial libraries. A DMCA subpoena, issued by a D.C. federal court, requires Cloudflare to hand over identifying user data for possible legal action.
Most curious in this case is that they are trying to get Cloudflare to provide info about a website that does not host any infringing content:
As the name suggests, SLUM provides a status overview of various Shadow Library domains and relevant hyperlinks. However, as far as we can see, it doesn’t link to any specific infringing content.In fact, the site itself states that its goal is to provide neutral technical status monitoring and historical analysis. It does not host, mirror, or distribute any copyrighted material.
Copyright holders seem to believe their copyrights grant them such expansive authority they are able to demand identifying information about third-party websites that monitor uptime for copyright infringing websites.
Apparently the court clerk agrees with the publishers.