tex2lyx pulls in a few files in the src/ directory together with the src/support library. I reckon that changing the license of tex2lyx to the GPL will require the agreement of these people:
Alejandro Aguilar Sierra Alfredo Braunstein André Pönitz Angus Leeming Asger Alstrup Baruch Even Claus Hentschel Dirk Niggemann Georg Baum Herbert Voß Ivan Schreter Jean-Marc Lasgouttes John Levon João Luis M. Assirati Jürgen Vigna Lars Gullik Bjønnes Martin Vermeer Matthias Ettrich Ruurd A. Reitsma That's based on the '\author' field in the header of each file. As a first step, shall I drop off an email to all those people listed in the CREDITS file explaining that we'd like to use the GPL without this great big hole in it? Is this a good idea, or shall I just drop the whole thing? Perhaps we should have a page analogous to http://www.boost.org/more/blanket-permission.txt where we keep a record of those people that are happy with a change in licence. Something like: The following people hereby grant permission to replace all existing licenses on their contributions to LyX with the Gnu General Public License version 2 or later. -- Angus