Qt itself is LGPL now, so it no longer requires you to open-source code linked to it. Some of the language bindings that aren't maintained by Digia are still G

Qt itself is LGPL now, so it no longer requires you to open-source code linked to it. Some of the language bindings that aren't maintained by Digia are still GPL, though. An example of this is PyQt, and the PyQt team's intransigence on the GPL is why PySide exists.