<p>ChibiOS/RT is a <ahref="http://www.gnu.org/licenses"target="_top">GPL3</a>-licensed product but it offers a linking exception in its stable releases.<br/>
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 <aclass="el"href="lic_faq.html#exception_text">GPL Exception Text</a> under "Approved Interfaces" for details.</li>
<li>Improvements on modifiable OS code as described in the "approved interfaces" section of the <aclass="el"href="lic_faq.html#exception_text">GPL Exception Text</a>.</li>
<li><b>Is the exception applicable to any ChibiOS/RT version ?</b><br/>
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>
<li><b>I don't want to be bound by any of the above restriction, is this possible?</b><br/>
You may contact us about a commercial license.</li>
<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>
<oltype="1">
<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>
<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>
<li>The combined work is not itself an RTOS, scheduler, kernel or related product.</li>
<li>The combined work is not itself a binary library intended for linking into other software applications.</li>
<li>The files of Non-GPL Code may include the unmodified ChibiOS/RT distribution header files contained under:<ul>
<li>./os/kernel/include</li>
<li>./os/hal/include</li>
<li>./os/hal/platforms</li>
<li>./os/various</li>
</ul>
without causing the resulting work to be covered by the GNU General Public License.</li>
<li>The files of Non-GPL Code may link to the unmodified ChibiOS/RT distribution files contained under:<ul>
<li>./os/kernel/src</li>
<li>./os/hal/src</li>
<li>./os/hal/platforms</li>
<li>./os/various</li>
</ul>
without causing the resulting work to be covered by the GNU General Public License.</li>
<li>The files of Non-GPL Code may link to, or include, the modified or unmodified ChibiOS/RT distribution files contained under:<ul>
<li>./os/kernel/templates</li>
<li>./os/hal/templates</li>
<li>./os/ports</li>
<li>./boards</li>
<li>./demos</li>
</ul>
without causing the resulting work to be covered by the GNU General Public License.</li>
</ol>
<p>Only the copyright holder of ChibiOS/RT may make changes or additions to the list of Approved Interfaces.</p>
<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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