HandBrake License Most files in HandBrake are under the GNU General Public License Version 2 (GPLv2) license; read the file COPYING for details. Some files are under the GNU General Public License Version 2 or any later version (GPLv2+), the GNU Lesser General Public License Version 2.1 or any later version (LGPLv2.1+), or BSD/MIT/X11-style licenses. In combination, the GPLv2 license applies to HandBrake. The Fraunhofer AAC library (fdk-aac) is under a license incompatible with the GPLv2 license. Since both licenses cannot be satisfied simultaneously, binaries resulting from the combination of HandBrake and fdk-aac are neither free nor redistributable. As a result, fdk-aac is by default not included in HandBrake. If you wish to include fdk-aac in your personal build of HandBrake, you may do so by passing --enable-fdk-aac to configure and making sure not to distribute any resulting binaries. Please read the fdk-aac license for details.