Copyright gleaned from 
* Anything newer than or the same commit as 4084bb5 's setup.py is GPL
* Anything older than setup.py 4084bb5 is copyright unknown, unless it was committed by Matthew Wampler-Doty who's choice it was to GPL project (unless he corrects this), any public domain material since is considered to be part of the GPL-covered project
* Anything with its own license is that license
* Copyright is of stated authors and anyone who committed to respective files