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| 6 | <title>Qt Open Source Edition</title>
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| 18 | <td valign=center>
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| 19 | <a href="index.html">
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| 20 | <font color="#004faf">Home</font></a>
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| 21 | | <a href="classes.html">
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| 22 | <font color="#004faf">All Classes</font></a>
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| 23 | | <a href="mainclasses.html">
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| 24 | <font color="#004faf">Main Classes</font></a>
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| 25 | | <a href="annotated.html">
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| 26 | <font color="#004faf">Annotated</font></a>
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| 28 | <font color="#004faf">Grouped Classes</font></a>
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| 30 | <font color="#004faf">Functions</font></a>
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| 31 | </td>
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| 32 | <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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| 33 |
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| 34 |
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| 35 | <p>
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| 36 | <p> Open source software (also called "free software") is software that comes
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| 37 | with a license that gives users certain rights. In particular the right to
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| 38 | use the software, to modify it, to obtain its source, and to pass it on
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| 39 | (under the same terms).
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| 40 | <p> Trolltech supports the open source software concept by providing the Qt Open Source
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| 41 | Edition. You can use this edition of Qt to create open source software, i.e.
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| 42 | software that is licensed under the GNU GPL or a similarly recognized
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| 43 | open source license. Trolltech's support of open source with the Qt Open Source
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| 44 | Edition has enabled large successful software projects like KDE, to
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| 45 | thrive, with thousands of developers around the world using the Qt Open Source
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| 46 | Edition at no cost to themselves. The Qt Open Source Edition is available for
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| 47 | Unix/X11, Macintosh, and embedded Linux.
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| 48 | <p> The Open Source Edition can be downloaded from here:
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| 49 | <a href="http://www.trolltech.com/download/">http://www.trolltech.com/download/</a>.
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| 50 | <p> It is also possible to develop commercial software using Qt, but to do
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| 51 | so you must buy a commercial license for the <a href="commercialeditions.html">Professional or Enterprise Edition</a>. If
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| 52 | you buy a commercial edition of Qt you can sell your software for any
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| 53 | price and with any license you like. Thousands of commercial companies
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| 54 | use commercial editions of Qt to develop the products they sell.
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| 55 | <p> If you use the Qt Open Source Edition, there are certain licensing
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| 56 | conditions that the GNU GPL imposes on you, to ensure that your users
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| 57 | enjoy the freedoms guaranteed by the GPL. Users are entitled to:
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| 58 | <p> <ol type=1>
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| 59 | <li> Run your software for any purpose.
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| 60 | <li> Obtain and study your software's source code, and adapt it to their
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| 61 | needs.
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| 62 | <li> Redistribute your software and its source code to others (under the
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| 63 | same terms).
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| 64 | <li> Improve or modify your software, and release these changes to the
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| 65 | public.
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| 66 | </ol>
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| 67 | <p> These freedoms apply to all the source code for all the modules your
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| 68 | software is based on, regardless of whether they have been written by
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| 69 | you or by others. The freedoms also apply to any associated interface
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| 70 | definition files, and even include the scripts and control files used
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| 71 | to control compilation and installation of the executable; otherwise
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| 72 | users could not exercise their rights.
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| 73 | <p> This means that you cannot use the Qt Open Source Edition if your software
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| 74 | must be built with any modules that impose conditions on you that
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| 75 | contradict the conditions of the GNU GPL, including, but not limited
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| 76 | to, software patents, commercial license agreements, copyrighted
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| 77 | interface definitions or any sort of non-disclosure agreement. In
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| 78 | these circumstances you must use a commercial edition of Qt.
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| 79 | <p> See the <a href="faq.html">FAQ</a> for answers to frequently
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| 80 | asked questions on Qt Open Source Edition licensing and its implications.
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| 81 | <p> More information on open source software is available online:
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| 82 | <p> <ul>
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| 83 | <li> GNU GPL: <a href="http://www.gnu.org/">http://www.gnu.org/</a>
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| 84 | <li> Open source licensing: <a href="http://www.opensource.org/">http://www.opensource.org/</a>
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| 85 | </ul>
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| 86 | <p> Information about Qt Commercial License Agreements is available at
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| 87 | <a href="http://www.trolltech.com/pricing.html">http://www.trolltech.com/pricing.html</a>. You can also email
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| 88 | <a href="mailto:sales@trolltech.com">sales@trolltech.com</a>.
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| 89 | <p> If you are in doubt what edition of Qt is right for your project,
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| 90 | please contact
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| 91 | <a href="mailto:info@trolltech.com">info@trolltech.com</a>.
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| 92 | <p>
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| 93 | <!-- eof -->
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| 94 | <p><address><hr><div align=center>
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| 95 | <table width=100% cellspacing=0 border=0><tr>
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| 96 | <td>Copyright © 2007
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| 97 | <a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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| 98 | <td align=right><div align=right>Qt 3.3.8</div>
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| 99 | </table></div></address></body>
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| 100 | </html>
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