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97 lines
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<html><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
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<title>ChibiOS/RT: License and F.A.Q.</title>
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<td style="width: 80px;"><img alt="ChibiOS/RT Logo" src="logo_small.png"></td>
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<td><big><big>ChibiOS/RT</big></big><br><br>Architecture - Reference Manual - Guides</td>
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<td style="width: 80px;"></td>
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<div class="tabs">
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<ul>
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<li><a href="main.html"><span>Main Page</span></a></li>
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<li><a href="modules.html"><span>Modules</span></a></li>
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<li><a href="annotated.html"><span>Data Structures</span></a></li>
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<li><a href="files.html"><span>Files</span></a></li>
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<div class="navpath"><a class="el" href="main.html">ChibiOS/RT</a>
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<div class="contents">
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<h1><a class="anchor" id="lic_faq">License and F.A.Q. </a></h1><p>ChibiOS/RT is a <a href="http://www.gnu.org/licenses" target="_top">GPL3</a>-licensed product but it offers a linking exception in its stable releases.<br/>
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This article contains some answers about the exception.</p>
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<h2><a class="anchor" id="faq">
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Frequently Asked Questions</a></h2>
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<ul>
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<li><b>Is ChibiOS/RT free ?</b><br/>
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Yes, free as both in free beer and freedom.</li>
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<li><b>Can I use it in my commercial embedded product?</b><br/>
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Yes, you just have to advertise that you are using ChibiOS/RT by putting a link to the project somewhere on your web site or documentation.</li>
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<li><b>Am I forced to release the source code of my product?</b><br/>
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The exception to the GPL allows you to use ChibiOS/RT in your commercial application without have to release your source code under certains conditions. See the <a class="el" href="lic__faq.html#exception_text">GPL Exception Text</a> under "Approved Interfaces" for details.</li>
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<li><b>What I have to contribute back?</b><br/>
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In general you have to offer changes done on existing files (where allowed) or new developments done using the OS template files. As example:<ul>
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<li>Ports to new architectures because a new port uses copyrighted OS template files.</li>
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<li>New, HAL-style, device drivers because device drivers use copyrighted template files.</li>
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<li>Improvements on modifiable OS code as described in the "approved interfaces" section of the <a class="el" href="lic__faq.html#exception_text">GPL Exception Text</a>.</li>
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</ul>
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</li>
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<li><b>Is the exception applicable to any ChibiOS/RT version ?</b><br/>
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The exception is valid only for ChibiOS/RT releases marked as <em>stable</em>. Beta, unstable or development versions are covered by the GPL3 alone because are meant for testing only.</li>
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<li><b>I don't want to be bound by any of the above restriction, is this possible?</b><br/>
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You may contact us about a commercial license.</li>
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</ul>
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<h2><a class="anchor" id="exception_text">
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GPL Exception Text</a></h2>
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<center><b>GPL Exception Text for ChibiOS/RT 1.4.x</b></center><p>In addition, as a special exception, the copyright holder of ChibiOS/RT, gives You the additional right to link the unmodified code of this Program with code not covered under the GNU General Public License ("Non-GPL Code") and to distribute linked combinations including the two, subject to the limitations in this paragraph.</p>
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<ol type="1">
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<li>Non-GPL Code permitted under this exception must only link to the unmodified code of this Program through those well defined interfaces identified as "Approved Interfaces".</li>
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<li>Every copy of the combined work is accompanied by a written statement that details to the recipient the version of ChibiOS/RT used and an offer by yourself to provide the ChibiOS/RT source code should the recipient request it.</li>
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<li>The combined work is not itself an RTOS, scheduler, kernel or related product.</li>
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<li>The combined work is not itself a binary library intended for linking into other software applications.</li>
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</ol>
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<center><b>The Approved Interfaces</b></center><ol type="1">
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<li>The files of Non-GPL Code may include the unmodified ChibiOS/RT distribution header files contained under:<ul>
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<li>./os/kernel/include</li>
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<li>./os/hal/include</li>
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<li>./os/hal/platforms</li>
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<li>./os/various</li>
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</ul>
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without causing the resulting work to be covered by the GNU General Public License.</li>
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<li>The files of Non-GPL Code may link to the unmodified ChibiOS/RT distribution files contained under:<ul>
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<li>./os/kernel/src</li>
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<li>./os/hal/src</li>
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<li>./os/hal/platforms</li>
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<li>./os/various</li>
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</ul>
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without causing the resulting work to be covered by the GNU General Public License.</li>
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<li>The files of Non-GPL Code may link to, or include, the modified or unmodified ChibiOS/RT distribution files contained under:<ul>
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<li>./os/kernel/templates</li>
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<li>./os/hal/templates</li>
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<li>./os/ports</li>
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<li>./boards</li>
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<li>./demos</li>
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</ul>
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without causing the resulting work to be covered by the GNU General Public License.</li>
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</ol>
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<p>Only the copyright holder of ChibiOS/RT may make changes or additions to the list of Approved Interfaces.</p>
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<p>You must obey the GNU General Public License in all respects for all of the Program code and other code used in conjunction with the Program except the Non-GPL Code covered by this exception. </p>
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</div>
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<hr size="1"><address style="text-align: right;"><small>
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Generated on Sun Jul 11 13:13:09 2010 for ChibiOS/RT by <a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.6.3</small></address>
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