the tools (including your changes) under a compatible license, one which guarantees these four freedoms too</strong>. Thus, <strong>you can neither sell the tools, nor keep the source code private</strong>. You must list all the authors of the free software you share and change too. In short, the tools, with or without changes, must stay free.</p>
<p>If you include any part of the source code of our tools – even a short part – in your own tools, they must be released under a free software license too. <