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101 lines
4.9 KiB
101 lines
4.9 KiB
14 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/doc/freeeditions.doc:1 -->
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>Qt Open Source Edition</title>
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<style type="text/css"><!--
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--></style>
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</head>
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<body>
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<table border="0" cellpadding="0" cellspacing="0" width="100%">
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<tr bgcolor="#E5E5E5">
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<td valign=center>
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<a href="index.html">
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<font color="#004faf">Home</font></a>
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| <a href="classes.html">
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<font color="#004faf">All Classes</font></a>
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| <a href="mainclasses.html">
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<font color="#004faf">Main Classes</font></a>
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<font color="#004faf">Annotated</font></a>
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<font color="#004faf">Grouped Classes</font></a>
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<font color="#004faf">Functions</font></a>
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</td>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Qt Open Source Edition</h1>
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<p>
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<p> 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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<p> Trolltech supports the open source software concept by providing the Qt Open Source
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Edition. You can use this edition of Qt 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 Qt 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 Qt Open Source
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Edition at no cost to themselves. The Qt Open Source Edition is available for
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Unix/X11, Macintosh, and embedded Linux.
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<p> The Open Source Edition can be downloaded from here:
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<a href="http://www.trolltech.com/download/">http://www.trolltech.com/download/</a>.
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<p> 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 <a href="commercialeditions.html">Professional or Enterprise Edition</a>. If
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you buy a commercial edition of Qt 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 Qt to develop the products they sell.
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<p> If you use the Qt 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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<p> <ol type=1>
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<li> Run your software for any purpose.
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<li> Obtain and study your software's source code, and adapt it to their
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needs.
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<li> Redistribute your software and its source code to others (under the
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same terms).
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<li> Improve or modify your software, and release these changes to the
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public.
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</ol>
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<p> 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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<p> This means that you cannot use the Qt 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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<p> See the <a href="faq.html">FAQ</a> for answers to frequently
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asked questions on Qt Open Source Edition licensing and its implications.
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<p> More information on open source software is available online:
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<p> <ul>
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<li> GNU GPL: <a href="http://www.gnu.org/">http://www.gnu.org/</a>
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<li> Open source licensing: <a href="http://www.opensource.org/">http://www.opensource.org/</a>
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</ul>
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<p> Information about Qt Commercial License Agreements is available at
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<a href="http://www.trolltech.com/pricing.html">http://www.trolltech.com/pricing.html</a>. You can also email
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<a href="mailto:sales@trolltech.com">sales@trolltech.com</a>.
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<p> If you are in doubt what edition of Qt 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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<p>
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<!-- eof -->
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<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>Qt 3.3.8</div>
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</table></div></address></body>
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</html>
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