Canonical seems to provide Bazaar under different licenses as well, if
needed, which may include proprietary ones, see http://bazaar-
Upstart can only be licensed under GPL-compatible terms, since it links
with udev, as far as I can tell. Most of the other projects (those using
APT, e.g. via python-apt) can also be only licensed under the GPL because
APT and python-apt are GPL-licensed.