License

[tiagocampo]

http://blog.codinghorror.com/pick-a-license-any-license/

https://www.gnu.org/licenses/license-list.html

The best one:
http://www.wtfpl.net/

I think that all libraries that we use is under BSD.

[dpizetta]

PySide has been published as a response to the lack of suitably licensed Qt bindings for Python. PySide is licensed under the LGPL version 2.1 license, allowing both Free/Open source software and proprietary software development.

PyQt is available under the following licenses.
GNU General Public License v2
GNU General Public License v3
PyQt Commercial License
PyQt Embedded License
PyQt, unlike Qt, is not available under the LGPL.
If you use the GPL version of PyQt then any code you develop with it must be distributed under a compatable license. Like the GPL version of Qt, PyQt grants an exception to the GPL that specifies the list of licenses that you may use. The full text of the exception can be found in the PyQt source package.
If you are unable to distribute your code under the terms of the GPL then you must purchase a commercial license.

[dpizetta]

http://choosealicense.com/licenses/

[dpizetta]

Put anything you want.