> It's lawful if you have a good faith belief that it's a circumvention tool.

Is it? Isn't Section 512 the takedown section that applies to infringing works (e.g. notices require "Identification of the copyrighted work claimed to have been infringed", 512(c)(3)(A)(ii)) and Section 1201 the separate anti-circumvention section which has government-imposed criminal penalties but no private takedown provision?