http://u.qdnx.org/file/fsf-20171119T211412-g5ujxtg.html
The US Copyright Office shouldn't require proprietary software to register for DMCA safe harbor protection. But they do. Luckily, we have a workaround: https://www.fsf.org/blogs/licensing/you-can-now-register-as-a-dmca-agent-without-using-nonfree-javascript