Comment 9 for bug 1769267

wrt. the license issue

as duplicity is licensed
"
# Duplicity is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version.
"
note the _any later version_ option, we can easily include GPL3 code, which will make the whole then a GPL2 and GPL3 mixture. totally legal ;)
the other way around won't work though, basing GPL2'd code on GPL3 code.

..ede/duply.net