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/*!
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\page opensourceedition.html
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\title TQt Open Source Edition
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Open source software (also called "free software") is software that comes
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with a license that gives users certain rights. In particular the right to
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use the software, to modify it, to obtain its source, and to pass it on
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(under the same terms).
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Trolltech supports the open source software concept by providing the TQt Open Source
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Edition. You can use this edition of TQt to create open source software, i.e.
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software that is licensed under the GNU GPL or a similarly recognized
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open source license. Trolltech's support of open source with the TQt Open Source
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Edition has enabled large successful software projects like KDE, to
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thrive, with thousands of developers around the world using the TQt Open Source
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Edition at no cost to themselves. The TQt Open Source Edition is available for
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Unix/X11 and Macintosh.
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The Open Source Edition can be downloaded from here:
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\l http://www.trolltech.com/download/.
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It is also possible to develop commercial software using Qt, but to do
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so you must buy a commercial license for the \link
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commercialeditions.html Professional or Enterprise Edition\endlink. If
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you buy a commercial edition of TQt you can sell your software for any
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price and with any license you like. Thousands of commercial companies
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use commercial editions of TQt to develop the products they sell.
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If you use the TQt Open Source Edition, there are certain licensing
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conditions that the GNU GPL imposes on you, to ensure that your users
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enjoy the freedoms guaranteed by the GPL. Users are entitled to:
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\list 1
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\i Run your software for any purpose.
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\i Obtain and study your software's source code, and adapt it to their
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needs.
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\i Redistribute your software and its source code to others (under the
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same terms).
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\i Improve or modify your software, and release these changes to the
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public.
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\endlist
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These freedoms apply to all the source code for all the modules your
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software is based on, regardless of whether they have been written by
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you or by others. The freedoms also apply to any associated interface
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definition files, and even include the scripts and control files used
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to control compilation and installation of the executable; otherwise
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users could not exercise their rights.
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This means that you cannot use the TQt Open Source Edition if your software
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must be built with any modules that impose conditions on you that
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contradict the conditions of the GNU GPL, including, but not limited
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to, software patents, commercial license agreements, copyrighted
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interface definitions or any sort of non-disclosure agreement. In
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these circumstances you must use a commercial edition of Qt.
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See the \link faq.html FAQ \endlink for answers to frequently
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asked questions on TQt Open Source Edition licensing and its implications.
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More information on open source software is available online:
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\list
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\i GNU GPL: \l http://www.gnu.org/
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\i Open source licensing: \l http://www.opensource.org/
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\endlist
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Information about TQt Commercial License Agreements is available at
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\l http://www.trolltech.com/pricing.html. You can also email
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<a href="mailto:sales@trolltech.com">sales@trolltech.com</a>.
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If you are in doubt what edition of TQt is right for your project,
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please contact
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<a href="mailto:info@trolltech.com">info@trolltech.com</a>.
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*/
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