This is the reference implementation of FLIF, copyright (C) 2016 Jon Sneyers and Pieter Wuille.

It is released under the terms of the GNU Lesser General Public License version 3 or later (LGPLv3+).
The license terms can be found in the files LICENSE_GPL and LICENSE_LGPL.

The code of the FLIF decoder (not the encoder!) is released under the terms of the Apache 2.0 license.
The library libflif_dec is available under these terms.
A copy of the Apache 2.0 license is available in the file LICENSE_Apache2.