<p><strong>Freedom 1: </strong>The freedom to study how the program works, and change it so it does your computing as you wish. Access to the source code is a precondition for this.</p>
<p><strong>Freedom 2: </strong>The freedom to redistribute copies so you can help others.</p>
<p><strong>Freedom 3: </strong>The freedom to distribute copies of your modified versions to others. By doing this you can give the whole community a chance to benefit from your changes. Access to the source code is a precondition for this.</p>
<p>A lot of free software uses the <ahref="https://www.gnu.org/licenses/gpl-3.0.en.html">GNU General Public License (GPL)</a>. By using it, you support the free software movement and empower people through software.</p>
<p>Free software uses the <ahref="https://www.gnu.org/licenses/licenses.html#GPL">GNU General Public License (GPL)</a>. Many legacy programs use <ahref="https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html">GPLv2</a> while most new free software uses the <ahref="https://www.gnu.org/licenses/gpl-3.0.en.html">GPLv3.</a> By using it, you support the free software movement and empower people through software.</p>
<p>This is just the tip of the iceberg. To read more about free software, start with the <ahref="https://www.gnu.org/philosophy/free-sw.en.html">"What is Free Software?"</a> page on <ahref="https://www.gnu.org/">GNU's website.</a></p>