The software was originally developed by Robert Woodcock <rcw@debian.org>.
It was also debianized by Robert Woodcock on Sun, 21 Feb 1999 18:50:34 -0800.

It is available at: https://abcde.einval.com/wiki/

Copyright:

Copyright (c) 1998-2001 Robert Woodcock <rcw@debian.org>
Copyright (c) 2003-2009 Jesus Climent <jesus.climent@hispalinux.es>
Copyright (c) 2009-2012 Colin Tuckley <colint@debian.org>
Copyright (c) 2012-     Steve McIntyre <steve@einval.com>
Copyright (c) 2015-     Andrew Strong <andrew.david.strong@gmail.com>

and many other contributors

This code is hereby licensed for public consumption under either the
GNU GPL v2 or greater, or Larry Wall's Artistic license - your choice.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.

An earlier abcde copyright included the text:

  Copyright for this work is to expire January 1, 2010, after which it
  shall be public domain.

However, later versions (2.6 onwards) have been developed solely using
the GPL. Earlier versions are still available in various places if
you'd rather have the public domain code.

See /usr/share/common-licenses/GPL-2

