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License" with "BusyBox is licensed under the GNU General Public License version 2 or later... (This is the same license the Linux kernel is under...)" Except that the Linux kernel isn't under GPLv2 or later, it's just under GPLv2. Now they match again.
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<!--#include file="header.html" -->
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<p>
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<h3>BusyBox is licensed under the GNU General Public License</h3>
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<p>BusyBox is licensed under <a href="http://www.gnu.org/licenses/gpl.html#SEC1">the
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GNU General Public License</a> version 2, which is generally
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abbreviated as the GPL. (This is the same license the Linux kernel is under,
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so you may be somewhat familiar with it by now.)</p>
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<p><a href="/products.html">Anyone thinking of shipping BusyBox as part of a
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product</a> should be familiar with the licensing terms under which they are
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allowed to use and distribute BusyBox. Read the full test of the GPL (either
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through the above link, or in the file LICENSE in the busybox tarball), and
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also read the <a href="http://www.gnu.org/licenses/gpl-faq.html">Frequently
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Asked Questions about the GPL</a>.</p>
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<p>Basically, if you distribute GPL software the license requires that you also
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distribute the source code to that GPL-licensed software. So if you distribute
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BusyBox without making the source code to the version you distribute available,
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you violate the license terms, and thus infringe on the copyrights of BusyBox.
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(This requirement applies whether or not you modified BusyBox; either way the
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license terms still apply to you.) Read the license text for the details.</p>
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<p>BusyBox's copyrights are enforced by the <a
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href="http://www.softwarefreedom.org">Software Freedom Law Center</a>, which
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"accepts primary responsibility for enforcement of US copyrights on the
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software... and coordinates international copyright enforcement efforts for
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such works as necessary." If you distribute BusyBox in a way that doesn't
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comply with the terms of the license BusyBox is distributed under, expect to
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hear from these guys. Their entire reason for existing is to do pro-bono
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legal work for free/open source software projects. (We used to list people who
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violate the BusyBox license in <a href="/shame.html">The Hall of Shame</a>,
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but these days we find it much more effective to hand them over to the
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lawyers.)</p>
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<p>Our enforcement efforts are aimed at bringing people into compliance with
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the BusyBox license. Open source software is under a different license from
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proprietary software, but if you violate that license you're still a software
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pirate and the law gives the vendor (us) some big sticks to play with. We
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don't want monetary awards, injunctions, or to generate bad PR for a company,
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unless that's the only way to get somebody that repeatedly ignores us to comply
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with the license on our code.</p>
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<h3>A Good Example</h3>
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<p>These days, <a href="http://www.linksys.com/">Linksys</a> is
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doing a good job at complying with the GPL, they get to be an
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example of how to do things right. Please take a moment and
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check out what they do with
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<a href="http://www.linksys.com/servlet/Satellite?c=L_Content_C1&childpagename=US%2FLayout&cid=1115416836002&pagename=Linksys%2FCommon%2FVisitorWrapper">
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distributing the firmware for their WRT54G Router.</a>
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Following their example would be a fine way to ensure that you
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have also fulfilled your licensing obligations.</p>
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