Last modified: 2014-11-06 00:35:10 UTC
Flow.php has the MIT license (or a close variant) at the top. However, Flow.alias.php has GPLv2 (or later) and the COPYING file is GPLv2 (the latter automatically appears at https://en.wikipedia.org/wiki/Special:Version/License/Flow too). I'm assuming it's supposed to be GPLv2 or later.