"Qt 4.5 upwards is licensed under the LGPL license; also, commercial licenses are available from Nokia." Since new version of Qt 5 is realsed and Licenced under Digia. So i am fixing this issue . i am going to write it as PyQt5 is licensed on all platforms under a commercial license and the GPL v3. Your PyQt5 license must be compatible with your Qt license. If you use the GPL version then your own code must also use a compatible license. Note:-PyQt5, unlike Qt, is not available under the LGPL. You can purchase a commercial PyQt5 license here.