<!--#include virtual="/server/header.html" --> <!-- Parent-Version:1.771.96 --> <!-- This page is derived from /server/standards/boilerplate.html --> <!--#set var="TAGS" value="essays licensing copyleft" --> <!--#set var="DISABLE_TOP_ADDENDUM" value="yes" --> <title>Why Copyleft? - GNU Project - Free Software Foundation</title> <!--#include virtual="/philosophy/po/why-copyleft.translist" --> <!--#include virtual="/server/banner.html" --> <!--#include virtual="/philosophy/ph-breadcrumb.html" --> <!--GNUN: OUT-OF-DATE NOTICE--> <!--#include virtual="/server/top-addendum.html" --> <div class="article reduced-width"> <h2>Why Copyleft?</h2><p> <cite>“When<div class="important"> <p><em>When it comes to defendingthe freedom of others,everyone's freedom, to lie down and do nothing is an act of weakness, nothumility.”</cite> </p>humility.</em></p> </div> <p> In the GNU Project we usually recommend people use <ahref="/copyleft/copyleft.html">copyleft</a>href="/licenses/copyleft.html">copyleft</a> licenses like GNU GPL, rather than permissive non-copyleft free software licenses. We don't argue harshly against the non-copyleft licenses—in fact, we occasionally recommend them in special circumstances—but the advocates of those licenses show a pattern of arguing harshly against the<acronym<abbr title="General PublicLicense">GPL</acronym>.License">GPL</abbr>. </p> <p> In one such argument, a person stated that his use of one of the BSD licenses was an “act of humility”: “I ask nothing of those who use my code, except to credit me.” It is rather a stretch to describe a legal demand for credit as“humility”,“humility,” but there is a deeper point to be considered here. </p> <p> Humility isabnegatingdisregarding your ownself interest,self-interest, butyou andtheone who usesinterest you abandon when you don't copyleft your codeare not the only ones affected by your choice of which free software license to use foris much bigger than yourcode.own. Someone who uses your code in a nonfree program istrying to denydenying freedom to others,andso if youlet him do it,allow that, you're failing to defendtheirthose people's freedom. When it comes to defendingthe freedom of others,everyone's freedom, to lie down and do nothing is an act of weakness, not humility. </p> <p> Releasing your code under <a href="/licenses/bsd.html"> one of the BSDlicenses,licenses</a>, or some other lax, permissivenon-copyleftlicense, is not doing wrong; the program is still free software, and still a contribution to our community. But it is weak, and in most cases it is not the best way to promote users' freedom to share and change software. </p> <p> Here are specific examples of nonfree versions of free programs that have done major harm to the free world.</p> <ul> <li>Those who released LLVM under a non-copyleft license <a href="https://www.anandtech.com/show/5238/nvidia-releases-cuda-41-cuda-goes-llvm-and-open-source-kind-of">enabled nVidia to release a high-quality nonfree compiler</a> for its GPUs, while keeping its instruction set secret. Thus, we can't write a free compiler for that platform without a big reverse engineering job. The nonfree adaptation of LLVM is the only compiler for those machines, and is likely to remain so.</li> <li>Intel uses <a href="https://www.tomshardware.com/news/google-removing-minix-management-engine-intel,35876.html">a proprietary version of the MINIX system</a>, which is free but not copylefted, in the Management Engine back door in its modern processors.</li> </ul> </div> </div><!-- for id="content", starts in the include above --> <!--#include virtual="/server/footer.html" --> <divid="footer">id="footer" role="contentinfo"> <div class="unprintable"> <p>Please send general FSF & GNU inquiries to <a href="mailto:gnu@gnu.org"><gnu@gnu.org></a>. There are also <a href="/contact/">other ways to contact</a> the FSF. Broken links and other corrections or suggestions can be sent to <a href="mailto:webmasters@gnu.org"><webmasters@gnu.org></a>.</p> <p><!-- TRANSLATORS: Ignore the original text in this paragraph, replace it with the translation of these two: We work hard and do our best to provide accurate, good quality translations. However, we are not exempt from imperfection. 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