[BangPypers] Suggestion for GUI

Pradeep Gowda pradeep at btbytes.com
Mon Jan 10 06:08:00 CET 2011

On Sun, Jan 9, 2011 at 11:39 PM, Narendra Sisodiya
<narendra at narendrasisodiya.com> wrote:
> On Mon, Jan 10, 2011 at 7:55 AM, Pradeep Gowda <pradeep at btbytes.com> wrote:
>> On Sun, Jan 9, 2011 at 6:22 PM, Narendra Sisodiya
>> <narendra at narendrasisodiya.com> wrote:
>> > On Mon, Jan 10, 2011 at 3:54 AM, Vivek Khurana <hiddenharmony at gmail.com
>> >wrote:
>> >
>> >> On Mon, Jan 10, 2011 at 3:44 AM, Narendra Sisodiya
>> >> <narendra at narendrasisodiya.com> wrote:
>> >> > At the same time, I do not want to use any restricted Libraries.. Can
>> >> > somebody explain license of PyQT ?
>> >> >
>> >>
>> http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/pyqt4ref.html#licenseAll
>> >> > I want my code to be GPLv3.
>> >> >
>> >>
>> >>  If you want the code to be in GPL, then where is the problem/confusion
>> ?
>> >>
>> >
>> > Ok, So why that commercial license they have listed, for what purpose one
>> > should need that license..?
>> > I mean, I can code using PyQT and give to my customer and he can install
>> all
>> > the needed libraries..
>> 1. Some companies don't want anything associated with with Free
>> software, they would rather
>> pay money to keep their entire software stack "clean".
>> 2. Allows Riverbank to make money from users who want to ship closed
>> source software developed
>> using PyQt.
> That's exactly I want to understand. Let take a fictitious example
> I purchased a book on PyQt. I wrote an excellent close software which is
> based on PyQt. I am start selling this proprietary software in market.
> people started purchasing this software from my website. They download PyQT.
> and they run my close software.
> Now in this process, neither I no my customer paid any money to PyQT. So
> this is OK or me or my customer are making copyright infringement.
> I want to understand the benefit/advantage of buying commercial license for
> PyQT.

If I understand the GPL correctly, the situation you are describing is
in violation
of the GPL terms because your code depends on PyQt code to run.

Compare this to the Library/Lesser GPL, where the license explicitly
allows you to link
against LGPL'd libraries without having to provide the code of your

I believe  it is only fair (and legally required) to pay a licensing
fee to riverbank
if you are selling the software without disclosing source. After all
even they have
to make money for investing their time and expertise that provides
value to you and
the customer.


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