<p>Yaffs is available under the GNU General Public Licence, v.2&nbsp; and under commercial terms.</p>

<p>For testing and experiment you can grab Yaffs under the GPL free of charge right now&nbsp;<strong><a href="/download-yaffs-using-git">from our GIT repository</a>&nbsp;</strong>and we strongly recommend you also read <strong><a href="/documents/how-yaffs-works">How Yaffs Works</a></strong>.</p>

<p>The GIT summary page shows <strong>the <a href="http://aleph1.co.uk/gitweb?p=yaffs2.git;a=summary">changes that have been made over time</a> </strong>in the base code.</p>

<h3>LICENSES FOR YAFFS</h3>

<p>Yaffs is the property of Aleph One Limited.</p>

<p>Yaffs is available free of charge under the terms of the GNU General Public&nbsp;License version 2, GNU GPL2 &nbsp; given at:-&nbsp;<a href="http://www.gnu.org/licenses/gpl-2.0.html">http://www.gnu.org/licenses/gpl-2.0.html</a></p>

<p>See especially Sections 3.a and 3.b.&nbsp; These and the following sections describe the&nbsp;obligations placed on those who distribute source and/or object code&nbsp;embodying or associated with GPL code, and therefore <strong>apply to all who&nbsp;use Yaffs under GPL</strong>.</p>

<p>Linking Yaffs to other software creates a derived work and our&nbsp;interpretation of linking includes dynamic and runtime linking.&nbsp; The&nbsp;derived work has the usual GPL obligation to release source code to&nbsp;anyone who asks. This remains true if you use Yaffs with another, or&nbsp;no, OS.</p>

<h4>Commercial licensing</h4>

<p>Aleph One, as owners of Yaffs, sell commercial Licences for the use of Yaffs which&nbsp;do <em>NOT</em> carry the obligations of GPL.</p>

<p>Contributing modifications of Yaffs code to the mainline code does not&nbsp;alter its Licence status.</p>

<p>Commercial Yaffs licences are non-exclusive, perpetual, world-wide, royalty-free and paid for with a single fee for one product. A commercial Licence entitles you to most further development and improvement of the Yaffs code.</p>

<p>The base price for a Licence for a single Product is GB£10,000. Sterling</p>

<p>You can find further information about Licences in these documents:</p>

<ul>
	<li><a href="yaffs-gpl">Yaffs under GPL</a></li>
	<li><a href="yaffs-licence-faqs">Yaffs licensing FAQ</a></li>
	<li><a href="/licences-more-background-and-detail">Further licensing background and detail</a></li>
	<li><a href="/yaffs-licence-sample">Sample commercial licence</a></li>
</ul>

<p>If you have any questions, or would like to buy a commercial licence, please contact us either at&nbsp;+44 (0)1223 811679 or email&nbsp; sales@aleph1.co.uk&nbsp; or see our Contacts page:-&nbsp; <a href="http://www.aleph1.co.uk/contact">http://www.aleph1.co.uk/contact</a></p>
