Upstream Source =============== Location: Libav ----- Most files in Libav are under the GNU Lesser General Public License version 2.1 or later (LGPL v2.1+). Read the file COPYING.LGPLv2.1 for details. Some other files have MIT/X11/BSD-style licenses. In combination the LGPL v2.1+ applies to Libav. Some optional parts of Libav are licensed under the GNU General Public License version 2 or later (GPL v2+). See the file COPYING.GPLv2 for details. None of these parts are used by default, you have to explicitly pass --enable-gpl to configure to activate them. In this case, Libav's license changes to GPL v2+. Specifically, the GPL parts of Libav are - libpostproc - optional x86 optimizations in the files libavcodec/x86/idct_mmx.c - the X11 grabber in libavdevice/x11grab.c Distribution Packaging ====================== Copyright (C) 2012 Joseph Flynn his 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 3 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. On this system, a copy of the GNU General Public License may be found at .