Is anyone #onhere an open source software lawyer? :P
@Gargron This was one of Michael's talks (about free software licencing): https://wiki.fsfe.org/Events/Rhein-Main%202016-03-02?action=AttachFile&do=view&target=Lizenzen-2015.odp
This is the homepage of his law office: http://www.rechtsanwalt-stehmann.de/
I think you could simply approach him directly, if you're interested. Say hello to him from Stefanie Schulte, if you like.