(dick greenhaus here)Just to keep things straight. THe original Child collection is in the public domain; the Dover edition isn't (at least Dover's intro and editing aren't.) Bronson is not; it's owned by Princeton University Press.
I've been working sporadically with the idea of an electronic edition of Bronson. The problem isn't just transcribing the music---hell, that could be photocopied. Fitting the words to the music is a major problem, and is the one that's been slowing me down. Unfortunately, IMO at least, it's an essential part of the job (I have a few hundred processed so far). I'm also in touch with Princeton to investigate publishing rights.
Ideally, his project would be cross-referenced with an electronic edition of Child, but that's asking a hell of a lot.