
This is an email thread in which Qing Liu officially GPL's genus2reduction and
grants me (William Stei) permission to be the official maintainer/distributor. 
I've included the GPLv2+ license in the distribution accordingly.
(Note that since genus2reduction derives from PARI it would have to be licensed 
GPL anyway.)

Forwarded conversation
Subject: genus2reduction
------------------------

From: William Stein <wstein@gmail.com>
Date: Sun, Feb 17, 2008 at 3:04 PM
To: Qing.Liu@math.u-bordeaux1.fr


Hi Liu,

Sage is getting "big" and your package genus2reduction is of
course still part of Sage.  There are a bunch of people working
now to make Sage a part of Debian, and for this to happen we
need clear license statements for every component of Sage.

Would you be willing to officially release genus2reduction
under the GPL license?

Here's an interesting article about the GPL:
  http://www.dwheeler.com/essays/gpl-compatible.html

   -- William

   ---------------------------------------------------------------------
   From Qing.Liu@math.u-bordeaux1.fr Sat Jul 16 23:33:18 2005
   Return-path: <Qing.Liu@math.u-bordeaux1.fr>

   Hi William,

   It will be a pleasure for me that you include genus2reduction in SAGE.
   Note however that the program is not maintained anymore.  Please
   feel free to make any technical modifications to make it compile
   in recent systems.

   Best regards,

   Liu
   ---------------------------------------------------------------------



   --

   William Stein
   Associate Professor of Mathematics
   University of Washington
   http://wstein.org

   ----------
   From: Qing Liu <Qing.Liu@math.u-bordeaux1.fr>
   Date: Sun, Feb 17, 2008 at 3:51 PM
   To: William Stein <wstein@gmail.com>


   William Stein a écrit : Hi William,


   Yes I'd like to put the program under GPL.

   Best,

   Liu Institut de Mathématiques de Bordeaux
   Université Bordeaux 1
   http://www.math.u-bordeaux1.fr/~liu/



   ----------
   From: William Stein <wstein@gmail.com>
   Date: Sun, Feb 17, 2008 at 3:57 PM
   To: Qing Liu <Qing.Liu@math.u-bordeaux1.fr>


   Thanks!

   William

   - Show quoted text -
