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 <title>Why programs must not limit the freedom to run them
 - GNU Project - Free Software Foundation</title>
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 <h2>Why programs must not limit the freedom to run them</h2>
 
 <address class="byline">by <a href="https://www.stallman.org/">Richard
 Stallman</a></address>
 
 <p>Free software means software controlled by its users, rather than the
 reverse. Specifically, it means the software comes with <a
 href="/philosophy/free-sw.html">four essential freedoms
 that software users deserve</a>. At the head of the list is freedom 0,
 the freedom to run the program as you wish, in order to do what you wish.</p>
 
 <p>Some developers propose to place usage restrictions in software
 licenses to ban using the program for certain purposes, but that would
 be a disastrous path. This article explains why freedom 0 must not
 be limited. Conditions to limit the use of a program would achieve
 little of their aims, but could wreck the free software community.</p>
 
 <p>First of all, let's be clear what freedom 0 means. It means that
 the distribution of the software does not restrict how you use it.
 This doesn't make you exempt from laws. For instance, fraud is a
 crime in the US&mdash;a law which I think is right and proper.
 Whatever the free software license says, using a free program to carry
 out your fraud won't shield you from prosecution.</p>
 
 <p>A license condition against fraud would be superfluous in a country
 where fraud is a crime. But why not a condition against using it for
 torture, a practice that states frequently condone when carried out by
 the &ldquo;security forces&rdquo;?</p>
 
 <p>A condition against torture would not work, because enforcement of any
 free software license is done through the state. A state that wants
 to carry out torture will ignore the license. When victims of US
 torture try suing the US government, courts dismiss the cases on the
 grounds that their treatment is a national security secret. If a
 software developer tried to sue the US government for using a program
 for torture against the conditions of its license, that suit would be
 dismissed too. In general, states are clever at making legal excuses
 for whatever terrible things they want to do. Businesses with powerful
 lobbies can do it too.</p>
 
 <p>What if the condition were against some specialized private activity?
 For instance, PETA proposed a license that would forbid use of the
 software to cause pain to animals with a spinal column. Or there
 might be a condition against using a certain program to make or
 publish drawings of Mohammad. Or against its use in experiments with
 embryonic stem cells. Or against using it to make unauthorized copies
 of musical recordings.</p>
 
 <p>It is not clear these would be enforcible. Free software licenses are
 based on copyright law, and trying to impose usage conditions that way
 is stretching what copyright law permits, stretching it in a dangerous
 way. Would you like books to carry license conditions about how you
 can use the information in them?</p>
 
 <p>What if such conditions are legally enforcible&mdash;would that be good?</p>
 
 <p>The fact is, people have very different ethical ideas about the
 activities that might be done using software. I happen to think those
 four unusual activities are legitimate and should not be forbidden.
 In particular I support the use of software for medical experiments on
 animals, and for processing meat. I defend the human rights of animal
 right activists but I don't agree with them; I would not want PETA to
 get its way in restricting the use of software.</p>
 
 <p>Since I am not a pacifist, I would also disagree with a &ldquo;no military
 use&rdquo; provision. I condemn wars of aggression but I don't condemn
 fighting back. In fact, I have supported efforts to convince various
 armies to switch to free software, since they can check it for back
 doors and surveillance features that could imperil national security.</p>
 
 <p>Since I am not against business in general, I would oppose a
 restriction against commercial use. A system that we could use only
 for recreation, hobbies and school is off limits to much of what we do
 with computers.</p>
 
 <p>I've stated above some parts of my views about certain political
 issues unrelated to the issue of free software&mdash;about which of
 those activities are or aren't unjust. Your views about them might
 differ, and that's precisely the point. If we accepted programs with
 usage restrictions as part of a free operating system such as GNU,
 people would come up with lots of different usage restrictions. There
 would be programs banned for use in meat processing, programs banned
 only for pigs, programs banned only for cows, and programs limited to
 kosher foods. Someone who hates spinach might license a program to
 allow use for processing any vegetable except spinach, while a Popeye
 fan's program might allow only use for spinach. There would be music
 programs allowed only for rap music, and others allowed only for
 classical music.</p>
 
 <p>The result would be a system that you could not count on for any
 purpose. For each task you wish to do, you'd have to check lots of
 licenses to see which parts of your system are off limits for that
 task.  Not only for the components you explicitly use, but also for
 the hundreds of components that they link with, invoke, or communicate
 with.</p>
 
 <p>How would users respond to that? I think most of them would use
 proprietary systems. Allowing usage restrictions in free software
 would mainly push users towards nonfree software.  Trying to stop
 users from doing something through usage restrictions in free software
 is as ineffective as pushing on an object through a long, straight,
 soft piece of cooked spaghetti.  As one wag put it, this is
 &ldquo;someone with a very small hammer seeing every problem as a
 nail, and not even acknowledging that the nail is far too big for the
 hammer.&rdquo;</p>
 
 <p>
 It is worse than ineffective; it is wrong too, because software
 developers should not exercise such power over what users do. Imagine
 selling pens with conditions about what you can write with them; that
 would be noisome, and we should not stand for it. Likewise for
 general software. If you make something that is generally useful,
 like a pen, people will use it to write all sorts of things, even
 horrible things such as orders to torture a dissident; but you must
 not have the power to control people's activities through their pens.
 It is the same for a text editor, compiler or kernel.</p>
 
 <p>You do have an opportunity to determine what your software can be used
 for: when you decide what functionality to implement. You can write
 programs that lend themselves mainly to uses you think are positive,
 and you have no obligation to write any features that might lend
 themselves particularly to activities you disapprove of.</p>
 
 <p>The conclusion is clear: a program must not restrict what jobs its
 users do with it. Freedom 0 must be complete. We need to stop
 torture, but we can't do it through software licenses. The proper job
 of software licenses is to establish and protect users' freedom.</p>
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