<i>&gt; Be nice or don&#x27;t use my software. You can&#x27;t sue people who use or share this software</i><p>Would such a rule even be enforcable? If so, what&#x27;s the penalty if a company sues users anyway?<p>I like how the GPL(v3) makes such rules enforcable by trackling them &quot;from behind&quot;. For example, the patent protection does <i>not</i> work by saying &quot;you must not sue people with your patents&quot;, which one would naively write into one&#x27;s license. Rather, they say (roughly) &quot;if you distribute the software, this includes a free patent license to all receivers.&quot;  And this is just one example. There is very clever legal stuff in the GPL, especially v3.<p>So I guess that the GPLv3 already does exactly what you want. It just doesn&#x27;t express this as directly as you would, but more &quot;from behind&quot;. However, this is for very good reasons, as it is necessary to do it that way, to make all this stuff enforcable within the legal framework of copyright law.