* The file libavcodec/i386/idct_mmx.c is distributed under the GNU General
Public License. It is strictly an optimization and its use is optional.
+* The file libavcodec/ac3dec.c is distributed under the GNU General Public
+ License. In order for (E-)AC-3 decoding to work you need to enable GPL
+ components.
+
* The file libavdevice/x11grab.c is distributed under the GNU General
Public License. X11 grabbing is optional.