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1  <!--#include virtual="/server/header.html" -->  <!--#include virtual="/server/header.html" -->
2    <!-- Parent-Version: 1.77 -->
3  <title>What is free software? - GNU Project - Free Software Foundation (FSF)</title>  <title>What is free software?
4    - GNU Project - Free Software Foundation</title>
5    
6  <meta http-equiv="Keywords" content="GNU, FSF, Free Software Foundation, Linux, Emacs, GCC, Unix, Free Software, Operating System, GNU Kernel, HURD, GNU HURD, Hurd" />  <meta http-equiv="Keywords" content="GNU, FSF, Free Software Foundation, Linux, Emacs, GCC, Unix, Free Software, Operating System, GNU Kernel, HURD, GNU HURD, Hurd" />
7  <meta http-equiv="Description" content="Since 1983, developing the free Unix style operating system GNU, so that computer users can have the freedom to share and improve the software they use." />  <meta http-equiv="Description" content="Since 1983, developing the free Unix style operating system GNU, so that computer users can have the freedom to share and improve the software they use." />
 <link rel="alternate" title="What's New" href="http://www.gnu.org/rss/whatsnew.rss" type="application/rss+xml" />  
 <link rel="alternate" title="New Free Software" href="http://www.gnu.org/rss/quagga.rss" type="application/rss+xml" />  
8    
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9  <!--#include virtual="/philosophy/po/free-sw.translist" -->  <!--#include virtual="/philosophy/po/free-sw.translist" -->
10    <!--#include virtual="/server/banner.html" -->
11    
12  <h2>What is free software?</h2>  <h2>What is free software?</h2>
13    <!--#include virtual="/licenses/fsf-licensing.html" -->
14    
15  <h3>The Free Software Definition</h3>  <h3>The Free Software Definition</h3>
16    
17  <blockquote>  <blockquote>
18    <p>
19  The free software definition presents the criteria for whether a  The free software definition presents the criteria for whether a
20  particular software program qualifies as free software.  From time to  particular software program qualifies as free software.  From time to
21  time we revise this definition, to clarify it or to resolve questions  time we revise this definition, to clarify it or to resolve questions
22  about subtle issues.  See the <a href="#History">History section</a>  about subtle issues.  See the <a href="#History">History section</a>
23  below for a list of changes that affect the definition of free  below for a list of changes that affect the definition of free
24  software.  software.
25    </p>
26  </blockquote>  </blockquote>
27    
28  <p>  <p>
29  &ldquo;Free software&rdquo; means software that respects users'  &ldquo;Free software&rdquo; means software that respects users'
30  freedom and community.  Roughly, the users have the freedom to run,  freedom and community.  Roughly, it means that <b>the users have the
31  copy, distribute, study, change and improve the software.  With these  freedom to run, copy, distribute, study, change and improve the
32  freedoms, the users (both individually and collectively) control the  software</b>.  Thus, &ldquo;free software&rdquo; is a matter of
33  program and what it does for them.  liberty, not price.  To understand the concept, you should think of
34  </p>  &ldquo;free&rdquo; as in &ldquo;free speech,&rdquo; not as in
35    &ldquo;free beer&rdquo;.  We sometimes call it &ldquo;libre
36  <p>  software&rdquo; to show we do not mean it is gratis.
 When users don't control the program, the program controls the users.  
 The developer controls the program, and through it controls the users.  
 This nonfree or &ldquo;proprietary&rdquo; program is therefore an  
 instrument of unjust power.  
37  </p>  </p>
38    
39  <p>  <p>
40  Thus, &ldquo;free software&rdquo; is a matter of liberty, not price.  We campaign for these freedoms because everyone deserves them.  With
41  To understand the concept, you should think of &ldquo;free&rdquo; as  these freedoms, the users (both individually and collectively) control
42  in &ldquo;free speech,&rdquo; not as in &ldquo;free beer&rdquo;.  the program and what it does for them.  When users don't control the
43    program, we call it a &ldquo;nonfree&rdquo; or
44    &ldquo;proprietary&rdquo; program.  The nonfree program controls the
45    users, and the developer controls the program; this makes the
46    program <a href="/philosophy/free-software-even-more-important.html">
47    an instrument of unjust power</a>.
48  </p>  </p>
49    
50  <p>  <p>
# Line 50  four essential freedoms: Line 53  four essential freedoms:
53  </p>  </p>
54    
55  <ul>  <ul>
56    <li>The freedom to run the program, for any purpose (freedom 0).</li>    <li>The freedom to run the program as you wish,
57          for any purpose (freedom 0).</li>
58    <li>The freedom to study how the program works, and change it so it    <li>The freedom to study how the program works, and change it so it
59        does your computing as you wish (freedom 1). Access to the source        does your computing as you wish (freedom 1). Access to the source
60        code is a precondition for this.        code is a precondition for this.
# Line 66  four essential freedoms: Line 70  four essential freedoms:
70  </ul>  </ul>
71    
72  <p>  <p>
73  A program is free software if users have all of these freedoms.  Thus,  A program is free software if it gives users adequately all of these
74  you should be free to redistribute copies, either with or without  freedoms.  Otherwise, it is nonfree.  While we can distinguish various
75  modifications, either gratis or charging a fee for distribution, to  nonfree distribution schemes in terms of how far they fall short of
76    being free, we consider them all equally unethical.</p>
77    
78    <p>In any given scenario, these freedoms must apply to whatever code
79    we plan to make use of, or lead others to make use of.  For instance,
80    consider a program A which automatically launches a program B to
81    handle some cases.  If we plan to distribute A as it stands, that
82    implies users will need B, so we need to judge whether both A and B
83    are free.  However, if we plan to modify A so that it doesn't use B,
84    only A needs to be free; we can ignore B.</p>
85    
86    <p>The rest of this page clarifies certain points about what makes
87    specific freedoms adequate or not.</p>
88    
89    <p>Freedom to distribute (freedoms 2 and 3) means you are free to
90    redistribute copies, either with or without modifications, either
91    gratis or charging a fee for distribution, to
92  <a href="#exportcontrol">anyone anywhere</a>.  Being free to do these  <a href="#exportcontrol">anyone anywhere</a>.  Being free to do these
93  things means (among other things) that you do not have to ask or pay  things means (among other things) that you do not have to ask or pay
94  for permission to do so.  for permission to do so.
# Line 93  for her purposes, but you are not entitl Line 113  for her purposes, but you are not entitl
113  </p>  </p>
114    
115  <p>  <p>
116    The freedom to run the program as you wish means that you are not
117    forbidden or stopped from doing so.  It has nothing to do with what
118    functionality the program has, or whether it is useful for what you
119    want to do.</p>
120    
121    <p>
122  The freedom to redistribute copies must include binary or executable  The freedom to redistribute copies must include binary or executable
123  forms of the program, as well as source code, for both modified and  forms of the program, as well as source code, for both modified and
124  unmodified versions.  (Distributing programs in runnable form is necessary  unmodified versions.  (Distributing programs in runnable form is necessary
# Line 105  make them. Line 131  make them.
131    
132  <p>  <p>
133  In order for freedoms 1 and 3 (the freedom to make changes and the  In order for freedoms 1 and 3 (the freedom to make changes and the
134  freedom to publish improved versions) to be meaningful, you must have  freedom to publish the changed versions) to be meaningful, you must have
135  access to the source code of the program.  Therefore, accessibility of  access to the source code of the program.  Therefore, accessibility of
136  source code is a necessary condition for free software.  Obfuscated  source code is a necessary condition for free software.  Obfuscated
137  &ldquo;source code&rdquo; is not real source code and does not count  &ldquo;source code&rdquo; is not real source code and does not count
# Line 118  the original.  If the program is deliver Line 144  the original.  If the program is deliver
144  run someone else's modified versions but refuse to run yours &mdash; a  run someone else's modified versions but refuse to run yours &mdash; a
145  practice known as &ldquo;tivoization&rdquo; or &ldquo;lockdown&rdquo;,  practice known as &ldquo;tivoization&rdquo; or &ldquo;lockdown&rdquo;,
146  or (in its practitioners' perverse terminology) as &ldquo;secure  or (in its practitioners' perverse terminology) as &ldquo;secure
147  boot&rdquo; &mdash; freedom 1 becomes a theoretical fiction rather  boot&rdquo; &mdash; freedom 1 becomes an empty pretense rather than a
148  than a practical freedom.  This is not sufficient.  In other words,  practical reality.  These binaries are not free
149  these binaries are not free software even if the source code they are  software even if the source code they are compiled from is free.
 compiled from is free.  
150  </p>  </p>
151    
152  <p>  <p>
# Line 144  as a free license. Line 169  as a free license.
169  <p>  <p>
170  In order for these freedoms to be real, they must be permanent and  In order for these freedoms to be real, they must be permanent and
171  irrevocable as long as you do nothing wrong; if the developer of the  irrevocable as long as you do nothing wrong; if the developer of the
172  software has the power to revoke the license, or retroactively change  software has the power to revoke the license, or retroactively add
173  its terms, without your doing anything wrong to give cause, the  restrictions to its terms, without your doing anything wrong to give
174  software is not free.  cause, the software is not free.
175  </p>  </p>
176    
177  <p>  <p>
178  However, certain kinds of rules about the manner of distributing free  However, certain kinds of rules about the manner of distributing free
179  software are acceptable, when they don't conflict with the central  software are acceptable, when they don't conflict with the central
180  freedoms.  For example, copyleft (very simply stated) is the rule that  freedoms.  For example, <a href="/copyleft/copyleft.html">copyleft</a>
181  when redistributing the program, you cannot add restrictions to deny  (very simply stated) is the rule that when redistributing the program,
182  other people the central freedoms.  This rule does not conflict with  you cannot add restrictions to deny other people the central freedoms.
183  the central freedoms; rather it protects them.  This rule does not conflict with the central freedoms; rather it
184    protects them.
185    </p>
186    
187    <p>
188    In the GNU project, we use copyleft to protect the four freedoms
189    legally for everyone.  We believe there are important reasons why
190    <a href="/philosophy/pragmatic.html">it is better to use
191    copyleft</a>.  However,
192    <a href="/philosophy/categories.html#Non-CopyleftedFreeSoftware">
193    noncopylefted free software</a> is ethical
194    too.  See <a href="/philosophy/categories.html">Categories of Free
195    Software</a> for a description of how &ldquo;free software,&rdquo;
196    &ldquo;copylefted software&rdquo; and other categories of software
197    relate to each other.
198  </p>  </p>
199    
200  <p>  <p>
# Line 171  you always have the freedom to copy and Line 210  you always have the freedom to copy and
210    
211  <p>  <p>
212  Whether a change constitutes an improvement is a subjective matter.  Whether a change constitutes an improvement is a subjective matter.
213  If your modifications are limited, in substance, to changes that  If your right to modify a program is limited, in substance, to changes that
214  someone else considers an improvement, that is not freedom.  someone else considers an improvement, that program is not free.
215  </p>  </p>
216    
217  <p>  <p>
# Line 188  the program, so you won't have trouble m Line 227  the program, so you won't have trouble m
227  </p>  </p>
228    
229  <p>  <p>
 A special issue arises when a license requires changing the name by  
 which the program will be invoked from other programs.  That  
 effectively hampers you from releasing your changed version so that it  
 can replace the original when invoked by those other programs.  This  
 sort of requirement is acceptable only if there's an suitable aliasing  
 facility that allows you to specify the original program's name as an  
 alias for the modified version.</p>  
   
 <p>  
230  Rules that &ldquo;if you make your version available in this way, you  Rules that &ldquo;if you make your version available in this way, you
231  must make it available in that way also&rdquo; can be acceptable too,  must make it available in that way also&rdquo; can be acceptable too,
232  on the same condition.  An example of such an acceptable rule is one  on the same condition.  An example of such an acceptable rule is one
# Line 209  are also acceptable. Line 239  are also acceptable.
239  </p>  </p>
240    
241  <p>  <p>
242  In the GNU project, we use  A special issue arises when a license requires changing the name by
243  <a href="/copyleft/copyleft.html">copyleft</a>  which the program will be invoked from other programs.  That
244  to protect these freedoms legally for everyone.  But  effectively hampers you from releasing your changed version so that it
245  <a href="/philosophy/categories.html#Non-CopyleftedFreeSoftware">noncopylefted  can replace the original when invoked by those other programs.  This
246  free software</a> also exists.  We believe there are important reasons why  sort of requirement is acceptable only if there's a suitable aliasing
247  <a href="/philosophy/pragmatic.html">it is better to use copyleft</a>,  facility that allows you to specify the original program's name as an
248  but if your program is noncopylefted free software, it is still basically  alias for the modified version.</p>
 ethical. (See <a href="/philosophy/categories.html">Categories of Free Software</a> for a description of how &ldquo;free software,&rdquo; &ldquo;copylefted software&rdquo; and other categories of software relate to each other.)  
 </p>  
249    
250  <p>  <p>
251  Sometimes government <a id="exportcontrol">export control regulations</a>  Sometimes government <a id="exportcontrol">export control regulations</a>
# Line 227  eliminate or override these restrictions Line 255  eliminate or override these restrictions
255  is refuse to impose them as conditions of use of the program.  In this  is refuse to impose them as conditions of use of the program.  In this
256  way, the restrictions will not affect activities and people outside the  way, the restrictions will not affect activities and people outside the
257  jurisdictions of these governments.  Thus, free software licenses  jurisdictions of these governments.  Thus, free software licenses
258  must not require obedience to any export regulations as a condition of  must not require obedience to any nontrivial export regulations as a
259  any of the essential freedoms.  condition of exercising any of the essential freedoms.
260    </p>
261    
262    <p>
263    Merely mentioning the existence of export regulations, without making
264    them a condition of the license itself, is acceptable since it does
265    not restrict users.  If an export regulation is actually trivial for
266    free software, then requiring it as a condition is not an actual
267    problem; however, it is a potential problem, since a later change in
268    export law could make the requirement nontrivial and thus render the
269    software nonfree.
270    </p>
271    
272    <p>
273    A free license may not require compliance with the license of a
274    nonfree program.  Thus, for instance, if a license requires you to
275    comply with the licenses of &ldquo;all the programs you use&rdquo;, in
276    the case of a user that runs nonfree programs this would require
277    compliance with the licenses of those nonfree programs; that makes the
278    license nonfree.
279    </p>
280    
281    <p>
282    It is acceptable for a free license to specify which jurisdiction's
283    law applies, or where litigation must be done, or both.
284  </p>  </p>
285    
286  <p>  <p>
# Line 297  help you can ensure that the license rea Line 349  help you can ensure that the license rea
349  and avoid various practical problems.  and avoid various practical problems.
350  </p>  </p>
351    
352  <h2 id="beyond-software">Beyond Software</h2>  <h3 id="beyond-software">Beyond Software</h3>
353    
354  <p>  <p>
355  <a href="/philosophy/free-doc.html">Software manuals must be free</a>,  <a href="/philosophy/free-doc.html">Software manuals must be free</a>,
# Line 319  has been extended to a definition of <a Line 371  has been extended to a definition of <a
371  free cultural works</a> applicable to any kind of works.  free cultural works</a> applicable to any kind of works.
372  </p>  </p>
373    
374  <h2 id="open-source">Open Source?</h2>  <h3 id="open-source">Open Source?</h3>
375    
376  <p>  <p>
377  Another group has started using the term &ldquo;open source&rdquo; to mean  Another group has started using the term &ldquo;open source&rdquo; to mean
# Line 330  word &ldquo;open&rdquo; <a href="/philos Line 382  word &ldquo;open&rdquo; <a href="/philos
382  never refers to freedom</a>.  never refers to freedom</a>.
383  </p>  </p>
384    
385  <h2 id="History">History</h2>  <h3 id="History">History</h3>
386    
387  <p>From time to time we revise this Free Software Definition.  Here is  <p>From time to time we revise this Free Software Definition.  Here is
388  the list of changes, along with links to show exactly what was  the list of substantive changes, along with links to show exactly what
389  changed.</p>  was changed.</p>
390    
391  <ul>  <ul>
392    
393    <li><a href="http://web.cvs.savannah.gnu.org/viewvc/www/philosophy/free-sw.html?root=www&amp;r1=1.140&amp;r2=1.141">Version
394    1.141</a>: Clarify which code needs to be free.</li>
395    
396    <li><a href="http://web.cvs.savannah.gnu.org/viewvc/www/philosophy/free-sw.html?root=www&amp;r1=1.134&amp;r2=1.135">Version
397    1.135</a>: Say each time that freedom 0 is the freedom to run the program
398    as you wish.</li>
399    
400    <li><a href="http://web.cvs.savannah.gnu.org/viewvc/www/philosophy/free-sw.html?root=www&amp;r1=1.133&amp;r2=1.134">Version
401    1.134</a>: Freedom 0 is not a matter of the program's functionality.</li>
402    
403    <li><a href="http://web.cvs.savannah.gnu.org/viewvc/www/philosophy/free-sw.html?root=www&amp;r1=1.130&amp;r2=1.131">Version
404    1.131</a>: A free license may not require compliance with a nonfree license
405    of another program.</li>
406    
407    <li><a href="http://web.cvs.savannah.gnu.org/viewvc/www/philosophy/free-sw.html?root=www&amp;r1=1.128&amp;r2=1.129">Version
408    1.129</a>: State explicitly that choice of law and choice of forum
409    specifications are allowed.  (This was always our policy.)</li>
410    
411    <li><a href="http://web.cvs.savannah.gnu.org/viewvc/www/philosophy/free-sw.html?root=www&amp;r1=1.121&amp;r2=1.122">Version
412    1.122</a>: An export control requirement is a real problem if the
413    requirement is nontrivial; otherwise it is only a potential problem.</li>
414    
415    <li><a href="http://web.cvs.savannah.gnu.org/viewvc/www/philosophy/free-sw.html?root=www&amp;r1=1.117&amp;r2=1.118">Version
416    1.118</a>: Clarification: the issue is limits on your right to modify,
417    not on what modifications you have made.  And modifications are not limited
418    to &ldquo;improvements&rdquo;</li>
419    
420    <li><a href="http://web.cvs.savannah.gnu.org/viewvc/www/philosophy/free-sw.html?root=www&amp;r1=1.110&amp;r2=1.111">Version
421    1.111</a>: Clarify 1.77 by saying that only
422    retroactive <em>restrictions</em> are unacceptable.  The copyright
423    holders can always grant additional <em>permission</em> for use of the
424    work by releasing the work in another way in parallel.</li>
425    
426  <li><a href="http://web.cvs.savannah.gnu.org/viewvc/www/philosophy/free-sw.html?root=www&amp;r1=1.104&amp;r2=1.105">Version  <li><a href="http://web.cvs.savannah.gnu.org/viewvc/www/philosophy/free-sw.html?root=www&amp;r1=1.104&amp;r2=1.105">Version
427  1.105</a>: Reflect, in the brief statement of freedom 1, the point  1.105</a>: Reflect, in the brief statement of freedom 1, the point
428  (already stated in version 1.80) that it includes really using your modified  (already stated in version 1.80) that it includes really using your modified
# Line 416  versions you distribute to the author.</ Line 501  versions you distribute to the author.</
501  </ul>  </ul>
502    
503  <p>There are gaps in the version numbers shown above because there are  <p>There are gaps in the version numbers shown above because there are
504  other changes in this page that do not affect the definition as such.  other changes in this page that do not affect the definition or its
505  These changes are in other parts of the page.  You can review the  interpretations.  For instance, the list does not include changes in
506  complete list of changes to the page through  asides, formatting, spelling, punctuation, or other parts of the page.
507    You can review the complete list of changes to the page through
508  the <a href="http://web.cvs.savannah.gnu.org/viewvc/www/philosophy/free-sw.html?root=www&amp;view=log">cvsweb  the <a href="http://web.cvs.savannah.gnu.org/viewvc/www/philosophy/free-sw.html?root=www&amp;view=log">cvsweb
509  interface</a>.</p>  interface</a>.</p>
510    
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511    
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518  <a href="mailto:gnu@gnu.org">&lt;gnu@gnu.org&gt;</a>.  <a href="mailto:gnu@gnu.org">&lt;gnu@gnu.org&gt;</a>.
519  There are also <a href="/contact/">other ways to contact</a>  There are also <a href="/contact/">other ways to contact</a>
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546  translations of this article.       Please make sure the copyright date is consistent with the
547  </p>       document.  For web pages, it is ok to list just the latest year the
548         document was modified, or published.
549        
550         If you wish to list earlier years, that is ok too.
551         Either "2001, 2002, 2003" or "2001-2003" are ok for specifying
552         years, as long as each year in the range is in fact a copyrightable
553         year, i.e., a year in which the document was published (including
554         being publicly visible on the web or in a revision control system).
555        
556         There is more detail about copyright years in the GNU Maintainers
557         Information document, www.gnu.org/prep/maintain. -->
558    
559    <p>Copyright &copy; 1996-2002, 2004-2007, 2009, 2010, 2012, 2013, 2015
560    Free Software Foundation, Inc.</p>
561    
 <p>  
 Copyright &copy; 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2004,  
 2005, 2006, 2007, 2009, 2010 Free Software Foundation, Inc.  
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562  <p>This page is licensed under a <a rel="license"  <p>This page is licensed under a <a rel="license"
563  href="http://creativecommons.org/licenses/by-nd/3.0/us/">Creative  href="http://creativecommons.org/licenses/by-nd/4.0/">Creative
564  Commons Attribution-NoDerivs 3.0 United States License</a>.  Commons Attribution-NoDerivatives 4.0 International License</a>.</p>
 </p>  
565    
566  <p>  <!--#include virtual="/server/bottom-notes.html" -->
567  Updated:  
568    <p class="unprintable">Updated:
569  <!-- timestamp start -->  <!-- timestamp start -->
570  $Date$  $Date$
571  <!-- timestamp end -->  <!-- timestamp end -->
572  </p>  </p>
573  </div>  </div>
   
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