LumenLumen is an independent 3rd party research project studying cease and desist letters concerning online content. The Copyright topic area includes discussions of traditional copyright, fair use, reverse engineering, and the additions to copyright law made by the the Digital Millennium Copyright Act (DMCA). Under the DMCA topic heading, we discuss the ISP "safe harbor" and its necessary conditions (notice and takedown), as well as the anticircumvention provisions of section 1201.