Copyright © 2012-2015 Kouhei Sutou <firstname.lastname@example.org>
port of Python’s difflib.
Copyright © 2001-2008 Python Software Foundation; All Rights Reserved Copyright © 2008-2011 Kouhei Sutou; All Rights Reserved
It is free software, and is distributed under (the new Ruby license or BSDL) and the PSF license.
Copyright © 2008-2017 Kouhei Sutou <email@example.com>