In order to isolate one part of the software as "the bad bits", you need either clear specific language in the law or a clearly established relevant legal precedent. Neither of these things currently exist in the context of DMCA 1201.

If you're curious, here's the most relevant parts of the text:

> No person shall manufacture, import, offer to the public, provide, or otherwise traffic in any technology, product, service, device, component, or part thereof, that [...] has only limited commercially significant purpose or use other than to circumvent a technological measure that effectively controls access to a work protected under this title;[...]

> As used in this subsection—[...]a technological measure “effectively controls access to a work” if the measure, in the ordinary course of its operation, requires the application of information, or a process or a treatment, with the authority of the copyright owner, to gain access to the work.

FYI: I am not a lawyer, but you can listen to a lawyer explain the above at the following link https://youtu.be/wROQUZDCIMI?t=868