“One of the GPLv3’s (GNU General Public License version 3) goals
was be more compatible with other open-source licenses. There is
some concern, however, that this goal has not been achieved in
relation to the Apache License 2.“As Allison Randal, president of The Perl Foundation, pointed
out in a recent article on O’Reilly Radar, the rationale document
for the latest GPLv3 draft, states ‘We regret that we will not
achieve compatibility of the Apache License, Version 2.0, with
GPLv3, despite what we had previously promised…'”