FLARToolKit is available for download and use under two licenses:
FLARToolKit can be used for free under the GNU General Public License, v3. Source code of applications using FLARToolKit under the GPL must be provided free of charge on request.
Source code of FLARToolKit applications can be protected with a commercial license, offered exclusively by ARToolworks. Applications using the commercial license do not have to provide source code, but must pay a licensing fee. Contact ARToolworks at firstname.lastname@example.org for more information.