Github pull request:
In case Proprietary Relicensing happens, copyleft is effectively wiped out.
What remains is a fallback license of sorts, which should at least require
attribution I think...
I wonder if this is enough, I can't figure out well enough what would
happen when all the
fun questions would be asked (compatibility...)
Reference: https://github.com/richardfontana/copyleft-next/pull/17
copyleft-next@lists.fedorahosted.org