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+<!--#include virtual="/server/header.html" -->
+<!-- Parent-Version: 1.79 -->
+<title>Why Free Software needs Free Documentation
+- GNU Project - Free Software Foundation</title>
+
+<!--#include virtual="/philosophy/po/free-doc.translist" -->
+<!--#include virtual="/server/banner.html" -->
+
+<h2>Why Free Software needs Free Documentation</h2>
+
+<blockquote class="announcement"><p>
+<a href="http://defectivebydesign.org/ebooks.html">Join our mailing list
+about the dangers of eBooks</a>.
+</p></blockquote>
+
+<ul>
+<li><a href="/copyleft/fdl.html">The GNU Free Documentation License</a></li>
+</ul>
+
+<p>
+The biggest deficiency in free operating systems is not in the
+software&mdash;it is the lack of good free manuals that we can include
+in these systems. Many of our most important programs do not come
+with full manuals. Documentation is an essential part of any software
+package; when an important free software package does not come with a
+free manual, that is a major gap. We have many such gaps today.</p>
+
+<p>
+Once upon a time, many years ago, I thought I would learn Perl. I got
+a copy of a free manual, but I found it hard to read. When I asked
+Perl users about alternatives, they told me that there were better
+introductory manuals&mdash;but those were not free (not
+freedom-respecting).</p>
+
+<p>
+Why was this? The authors of the good manuals had written them for
+O'Reilly Associates, which published them with restrictive
+terms&mdash;no copying, no modification, source files not
+available&mdash;which made them nonfree, thus excluded them from the
+Free World.</p>
+
+<p>
+That wasn't the first time this sort of thing has happened, and (to
+our community's great loss) it was far from the last. Proprietary
+manual publishers have enticed a great many authors to restrict their
+manuals since then. Many times I have heard a GNU user eagerly tell
+me about a manual that he is writing, with which he expects to help
+the GNU Project&mdash;and then had my hopes dashed, as he proceeded to
+explain that he had signed a contract with a publisher that would
+restrict it so that we cannot use it.</p>
+
+<p>
+Given that writing good English is a rare skill among programmers, we
+can ill afford to lose manuals this way.</p>
+
+<p>
+Free documentation, like free software, is a matter of freedom, not
+price. The problem with these manuals was not that O'Reilly
+Associates charged a price for printed copies&mdash;that in itself is
+fine. (The Free Software Foundation
+<a href="http://shop.fsf.org/category/books/">sells printed
+copies</a> of free <a href="/doc/doc.html">GNU manuals</a>, too.) But
+GNU manuals are available in source code form, while these manuals are
+available only on paper. GNU manuals come with permission to copy and
+modify; the Perl manuals do not. These restrictions are the problems.</p>
+
+<p>
+The criterion for a free manual is pretty much the same as for free
+software: it is a matter of giving all users certain freedoms.
+Redistribution (including commercial redistribution) must be
+permitted, so that the manual can accompany every copy of the program,
+on line or on paper. Permission for modification is crucial too.</p>
+
+<p>
+As a general rule, I don't believe that it is essential for people to
+have permission to modify all sorts of articles and books. The issues
+for writings are not necessarily the same as those for software. For
+example, I don't think you or I are obliged to give permission to
+modify articles like this one, which describe our actions and our
+views.</p>
+
+<p>
+But there is a particular reason why the freedom to modify is crucial
+for documentation for free software. When people exercise their right
+to modify the software, and add or change its features, if they are
+conscientious they will change the manual too&mdash;so they can provide
+accurate and usable documentation with the modified program. A manual
+which forbids programmers from being conscientious and finishing the job, or
+more precisely requires them to write a new manual from scratch if
+they change the program, does not fill our community's needs.</p>
+
+<p>
+While a blanket prohibition on modification is unacceptable, some
+kinds of limits on the method of modification pose no problem. For
+example, requirements to preserve the original author's copyright
+notice, the distribution terms, or the list of authors, are OK. It is
+also no problem to require modified versions to include notice that
+they were modified, even to have entire sections that may not be
+deleted or changed, as long as these sections deal with nontechnical
+topics. (Some GNU manuals have them.)</p>
+
+<p>
+These kinds of restrictions are not a problem because, as a practical
+matter, they don't stop the conscientious programmer from adapting the
+manual to fit the modified program. In other words, they don't block
+the free software community from making full use of the manual.</p>
+
+<p>
+However, it must be possible to modify all the <em>technical</em>
+content of the manual, and then distribute the result through all the usual
+media, through all the usual channels; otherwise, the restrictions do
+block the community, the manual is not free, and so we need another
+manual.</p>
+
+<p>
+Unfortunately, it is often hard to find someone to write another
+manual when a proprietary manual exists. The obstacle is that many
+users think that a proprietary manual is good enough&mdash;so they
+don't see the need to write a free manual. They do not see that the
+free operating system has a gap that needs filling.</p>
+
+<p>
+Why do users think that proprietary manuals are good enough? Some
+have not considered the issue. I hope this article will do something
+to change that.</p>
+
+<p>
+Other users consider proprietary manuals acceptable for the same
+reason so many people consider proprietary software acceptable: they
+judge in purely practical terms, not using freedom as a criterion.
+These people are entitled to their opinions, but since those opinions
+spring from values which do not include freedom, they are no guide for
+those of us who do value freedom.</p>
+
+<p>
+Please spread the word about this issue. We continue to lose manuals
+to proprietary publishing. If we spread the word that proprietary
+manuals are not sufficient, perhaps the next person who wants to help
+GNU by writing documentation will realize, before it is too late, that
+he must above all make it free.</p>
+
+<p>
+We can also encourage commercial publishers to sell free, copylefted
+manuals instead of proprietary ones. One way you can help this is to
+check the distribution terms of a manual before you buy it, and
+prefer copylefted manuals to noncopylefted ones.</p>
+<p>
+[Note: We maintain a <a href="/doc/other-free-books.html">page
+that lists free books available from other publishers</a>].</p>
+
+</div><!-- for id="content", starts in the include above -->
+<!--#include virtual="/server/footer.html" -->
+<div id="footer">
+<div class="unprintable">
+
+<p>Please send general FSF &amp; GNU inquiries to
+<a href="mailto:gnu@gnu.org">&lt;gnu@gnu.org&gt;</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">&lt;webmasters@gnu.org&gt;</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
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+ Please send your comments and general suggestions in this regard
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+ &lt;web-translators@gnu.org&gt;</a>.</p>
+
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+Please see the <a
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+README</a> for information on coordinating and submitting translations
+of this article.</p>
+</div>
+
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+<p>Copyright &copy; 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
+2005, 2006, 2007, 2009, 2015, 2016, 2019 Free Software Foundation, Inc.</p>
+
+<p>This page is licensed under a <a rel="license"
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+Commons Attribution-NoDerivatives 4.0 International License</a>.</p>
+
+<!--#include virtual="/server/bottom-notes.html" -->
+
+<p class="unprintable">Updated:
+<!-- timestamp start -->
+$Date: 2019/12/27 22:55:30 $
+<!-- timestamp end -->
+</p>
+</div>
+</div>
+</body>
+</html>