Dessign LLC, WordPress Themes both Free and Premium are under GPLv2 License
The GPL grants users the ability to modify and use the theme on as many sites as they wish, whether it be personal or commercial, and that they may even resell or redistribute the themes.
The license under which the WordPress software is released is the GPLv2 (or later) all current and future Dessign LLC WordPress Themes both Free and Premium are 100% GPL compatible.