GPL.

debian/copyright

@@ -4,13 +4,41 @@ Upstream-Contact: Oliver Jowett <oliver@mutability.co.uk>
 Source: https://github.com/mutability/dump1090
 
 Files: *
-Copyright: Salvatore Sanfilippo, Malcom Robb, Oliver Jowett and other contributors.
-License: BSD-3-Clause
+Copyright: Copyright 2012 Salvatore Sanfilippo <antirez@gmail.com>
+           Copyright 2013,2014 Malcolm Robb <Support@ATTAvionics.com>
+           Copyright 2014,2015 Oliver Jowett <oliver@mutability.co.uk>
+License: BSD-3-Clause and GPL-2+
+
+Files: demod_2400.c demod_2400.h demod_2000.h crc.h 
+Copyright: Copyright 2014,2015 Oliver Jowett <oliver@mutability.co.uk>
+License: GPL-2+
 
 Files: debian/*
-Copyright: 2014 Oliver Jowett
+Copyright: 2014,2015 Oliver Jowett <oliver@mutability.co.uk>
 License: BSD-3-Clause
 
+License: GPL-2+
+ This program is free software; you can redistribute it
+ and/or modify it under the terms of the GNU General Public
+ License as published by the Free Software Foundation; either
+ version 2 of the License, or (at your option) any later
+ version.
+ .
+ This program is distributed in the hope that it will be
+ useful, but WITHOUT ANY WARRANTY; without even the implied
+ warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ PURPOSE.  See the GNU General Public License for more
+ details.
+ .
+ You should have received a copy of the GNU General Public
+ License along with this package; if not, write to the Free
+ Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ Boston, MA  02110-1301 USA
+ .
+ On Debian systems, the full text of the GNU General Public
+ License version 2 can be found in the file
+ `/usr/share/common-licenses/GPL-2'.
+
 License: BSD-3-Clause
  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions