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What is the Qt Non-Commercial Edition for
Microsoft Windows?
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The Non-Commercial Edition is the Qt for
Windows toolkit, licensed for private
development of non-commercial software in a
non-commercial setting.
A non-commercial setting means that you must
not use the package in the course of your
employment or whilst engaged in activities
that will be compensated.
A non-commercial application is an
application that cannot be sold, leased,
rented or otherwise distributed for
recompense.
You may freely use Qt Non-Commercial Edition
for:
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Running software legally developed by
others
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Developing non-commercial software
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What is the idea behind having both a commercial
and a non-commercial version of Qt?
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The idea is to have a free of charge,
downloadable, Qt version on Windows that enables
private users to teach themselves Qt programming
skills and contribute to the ever growing pool of
free software based on Qt.
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Why didn't you release Qt for Windows under
GPL?
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The GNU GPL and the Trolltech QPL are
open-source, respectively Free Software licenses.
Note the capital "F". We are not
talking "free" as in "free
beer", but "Free" as in
"Free Speech". We released Qt/X11
under those licenses, because it runs as major
component on totally Free operating systems, such
as GNU/Linux and FreeBSD. We released Qt/Mac
under the GPL since an Open Source community
with the help from Apple is
emerging on the Mac OS X platform. Once Microsoft Windows
is completely open source, we will reconsider.
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Is Qt Non-Commercial Edition free software?
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Qt Non-Commercial Edition is freely downloadable,
and freely redistributable. However, usage is
restricted to the noncommercial private space,
source code is not included. Thus Qt
Non-Commercial Edition does not qualify as Free
Software in the sense of the Free Software
Foundation.
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Can I make software with the Qt Non Commercial
Edition and release it under the GPL, BSD, or
Artistic license?
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BSD and Artistic shouldn't be a problem.
GPL however is. One of the key features of
the GPL license is that it does not permit the
distribution of software linked to non-system
libraries that are distributed under different
licensing terms. The README in the Non-Commercial
download explains this thoroughly.
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Can I use the Non-Commercial Edition at work for
running this Qt-based application I just
downloaded?
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Yes, if the application was legally developed
with Qt.
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Using the Non-Commercial Edition, can I make
software for internal use in my
company/organization?
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No. As long as you are on the payroll of the
company/organization or are compensated
otherwise, this is not a non-commercial setting.
You need to buy a Qt Professional or Enterprise
Edition license for this.
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Does your licensing allow Qt be put on a
shareware distribution (CD/ftp archive etc.) free
of charge?
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Yes. Anyone may redistribute Qt Non-Commercial
Edition free of charge.
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I want to use Qt to develop commercial
software.
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You need to buy a Qt Professional or Enterprise
Edition license for this.
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Is there a shareware license for Qt?
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No. The administration costs of offering one are
too high. If your software is truly competitive
against the free software on offer, you could
consider making it a truly commercial
product.
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How can I license my cool free widget library
based on Qt Non-Commercial Edition?
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In the same way as you would license an
application developed with Qt Non-Commercial
Edition, i.e. pick a license compatible with
the Qt Non-Commercial License, for example
BSD or LGPL.
Please note that users of your library will
also be Qt Non-Commercial users, and Qt
Non-Commercial's licensing applies. This
applies to wrapper libraries as well, of
course. If you write Ada or Perl bindings,
fine. But anyone who uses your bindings will
be using Qt as well, and Qt's licensing
applies.
Send us a mail about your software if you
want us to include it on our web list of
Free Software Based on
Qt.
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Can I use Qt Non-Commercial Edition for research
projects at academic insitutions?
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No. Since you get paid for research projects this
is not a non-commercial setting. However we do
have an education program and academic discounts
are available, for more information look at Trolltech's educational
program.
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I can't install the Visual Studio integration
plugin on Windows NT
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This is because Visual Studio will not register
the plugin into the registry unless you have the
appropriate rights. All you need to do is log in
as adminstrator (or someone with the appropriate
rights) and copy the qmsdev.dll file from the
%QTDIR%\bin (QTDIR being where you installed Qt)
and copy it into %MSDEVDir%\AddIns (MSDEVDir is
the location of the MSDev98 folder which is part
of the Visual Studio installation). Then start
Visual Studio, and activate the plugin as
described in the readme file.
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I get an error message that says can't find
c:\program.obj
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This is because you have installed Qt into a
folder with a space in the folder name (e.g.
c:\Program Files). We recommend that you
reinstall Qt into a folder without a space in the
name.
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