[PyQt] License question...

Phil Thompson phil at riverbankcomputing.co.uk
Fri Jan 11 08:59:04 GMT 2008

On Thursday 10 January 2008, Laurent Dufrechou wrote:
> Hello,
> I've recently done a little widget and a little app for IPython for the Wx
> toolkit.
> I've released it under BSD license.
> Now I would like to port it to QT. If possible I would like to avoid GPL
> because professional user will not be able to use it (they would prefer
> LGPL for example).
> Is BSD license is ok with PyQT free open source licensing?
> If not, is there a way to develop free(and open source) qt widget without
> buying a pyqt license?(no money for QT+pyQT for the moment as it is just
> hobby dev)
> Something in fact, that could be reused by pyqt license buyer without being
> forced to release their code under GPL?

The Qt and PyQt exceptions to the GPL allow you to release your code under 
other specific licenses which include the BSD license.

However, those exceptions impose additional GPL-like conditions, ie. the 
viral-like conditions that are fundamental to the GPL. This effectively means 
that you are releasing your code under the GPL anyway.

See http://trolltech.com/products/qt/gplexception for the details.


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