...LICENSE
The Haytham is released under a dual license:
FREE VERSION:
The source code is released under GPL version 3.0. In short, it means that any distributed project that includes or links any portion of Haytham source code has to be released with the source code under a license compatible with GPLv3.
COMMERCIAL VERSION:
If you want to use the Haytham in a closed source commercial product, you must purchase the license. ...