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From: Vito De Tullio <vito.detullio@gmail.com>
Subject: Re: pyqt4 & qt license
Date: Sun, 10 Mar 2013 05:45:56 +0100
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Xref: csiph.com comp.lang.python:40999

D. Xenakis wrote:

> Can someone develop a closed source but NON-commercial software, by using
> PyQT4 GPL license?

no, by definition of GPL: if you are using a GPL library, you must 
distribute your software as GPL.

(the GPL does not care about commercial / non commercial)

http://www.gnu.org/licenses/gpl-faq.html#IfLibraryIsGPL

-- 
ZeD