Licensing Issues
GTK+ is released under the GNU Lesser General Public License (LGPL). To avoid any confusion or misinterpretation, I am going to quote directly from http://www.gtk.org/:
GTK+ is an Open Source Free Software GUI Toolkit, primarily developed for use with the X Window System. Everything about GTK+ from the object-oriented design to the Free Software LGPL licensing allows you to code your project with the most freedom possible. You can develop open software, free software, or even commercial non-free software without having to spend a dime for licenses or royalties.[1]
According to the GNU Web page on licensing, the GNU LGPL “is a free software license” that “permits linking with non-free modules.”[2]
[1] Amundson, Shawn T. “The Gimp ...
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