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33 tetsuya 53516 <title>Apache License v2.0 and GPL Compatibility - The Apache Software Foundation</title>
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51 pquerna 646711 <div class="block">
52     <div class="column span-24">
53     <div id="header">
54     <!-- Add 'default' header section here. -->
55     <h1>Apache License v2.0 and GPL Compatibility</h1>
56     </div>
57     </div>
58     </div>
59     <hr/>
60     <div class="block">
61     <div class="column span-8 prepend-16 search searchsub">
62     <form action="http://www.google.com/search" method="get">
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70     <div class="column span-15 colborder">
71    
72     <div class="section-content">
73     <p>
74     The <a href="http://www.fsf.org/">Free Software Foundation</a>
75     <a href="http://www.fsf.org/licensing/licenses/#apache2">considers</a>
76     the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>
77     to be a <a href="http://www.gnu.org/philosophy/free-sw.html">free software</a>
78     license, <a href="http://www.fsf.org/licensing/licenses/compat.html">compatible</a> with version 3 of the <a href="http://www.fsf.org/licensing/licenses/gpl.html">GPL</a>.
79     </p>
80 rubys 767889 <p>Apache 2 software can therefore be included in GPLv3 projects,
81     because the GPLv3
82     license accepts our software into GPLv3 works. However, GPLv3 software
83     cannot be included in Apache projects. The licenses are incompatible in one
84     direction only, and it is a result of ASF's licensing philosophy and the
85     GPLv3 authors' interpretation of copyright law.</p>
86     <p>This licensing incompatibility applies *only* when some Apache project
87     software becomes a derivative work of some GPLv3 software, because then the
88     Apache software would have to be distributed under GPLv3. This would be
89     incompatible with ASF's requirement that all Apache software must be
90     distributed under the Apache License 2.0.</p>
91     <p>We avoid GPLv3 software because merely linking to it is considered by the
92     GPLv3 authors to create a derivative work. We want to honor their license.
93     Unless GPLv3 licensors relax this interpretation of their own license
94     regarding linking, our licensing philosophies are fundamentally
95     incompatible. This is an identical issue for both GPLv2 and GPLv3.</p>
96 pquerna 646711 <p>Despite our best efforts, the FSF has never considered the Apache
97     License to be compatible with GPL version 2, citing the patent
98     termination and indemnification provisions as restrictions not present
99     in the older GPL license. The Apache Software Foundation believes
100     that you should always try to obey the constraints expressed by the
101     copyright holder when redistributing their work.</p>
102     </div>
103    
104 sgala 648016 <h4>
105 pquerna 646711 No, we don't have any patents
106     </h4>
107     <div class="section-content">
108     <p>
109     The Apache Software Foundation is a nonprofit organization
110     that is dedicated to open source software development.
111     We never knowingly incorporate patented technology in our own products
112     unless such technology has been offered free for everyone.
113     </p>
114     <p>
115     Please note that this discussion only benefits third parties that
116     produce GPL-covered products. The Apache Software Foundation does not
117     allow its own projects to distribute software under licenses more
118     restrictive than the Apache License, and the Free Software Foundation
119     does not distribute software under the Apache License.
120     </p>
121     <p>
122     The ASF will not dual-license our software because such licenses
123     make it impossible to determine the conditions under which we have
124     agreed to collaborate on a collective product, and are thus contrary to
125     the Apache spirit of open, collaborative development among individuals,
126     industry, and nonprofit organizations.
127     </p>
128     </div>
129     </div>
130 pquerna 646776 <div class="column span-8 last">
131     <div class="block">
132     <div class="nav column span-11">
133     <div>
134     <div class="menuheader"><a
135 slive 388798 href="http://projects.apache.org/">Apache Projects</a></div>
136 pquerna 646711 <ul>
137 slive 53573 <li><a href="http://httpd.apache.org/" title="Apache Web Server (httpd)">HTTP Server</a></li>
138 rooneg 731792 <li><a href="http://abdera.apache.org/" title="Atom Publishing Protocol Implementation">Abdera</a></li>
139 bayard 502827 <li><a href="http://activemq.apache.org/" title="Distributed Messaging System">ActiveMQ</a></li>
140 slive 53573 <li><a href="http://ant.apache.org/" title="Java-based build tool">Ant</a></li>
141     <li><a href="http://apr.apache.org/" title="Apache Portable Runtime libraries">APR</a></li>
142 bsnyder 651604 <li><a href="http://archiva.apache.org/" title="Build Artifact Repository Manager">Archiva</a></li>
143 slive 280620 <li><a href="http://beehive.apache.org/" title="Metadata frameworks for enterprise applications">Beehive</a></li>
144 mriou 746808 <li><a href="http://buildr.apache.org/" title="Simple and intuitive build system for Java applications">Buildr</a></li>
145 dkulp 736321 <li><a href="http://camel.apache.org/" title="Spring based Integration Framework which implements the Enterprise Integration Patterns">Camel</a></li>
146 bayard 502654 <li><a href="http://cayenne.apache.org/" title="User-friendly Java ORM with Tools">Cayenne</a></li>
147 leosimons 53588 <li><a href="http://cocoon.apache.org/" title="Web development framework: separation of concerns, component-based">Cocoon</a></li>
148 niallp 561221 <li><a href="http://commons.apache.org/" title="Reusable Java components">Commons</a></li>
149 brett 638116 <li><a href="http://continuum.apache.org/" title="Continuous Integration and Build Server">Continuum</a></li>
150 damien 727203 <li><a href="http://couchdb.apache.org/" title="RESTful document database">CouchDB</a></li>
151 bsnyder 651533 <li><a href="http://cxf.apache.org/" title="Service Framework">CXF</a></li>
152 slive 53573 <li><a href="http://db.apache.org/" title="Database access">DB</a></li>
153 brett 164388 <li><a href="http://directory.apache.org/" title="Apache Directory Server">Directory</a></li>
154 jerenkrantz 53634 <li><a href="http://excalibur.apache.org/" title="Embeddable software libraries related to component and service management access">Excalibur</a></li>
155 sebb 550970 <li><a href="http://felix.apache.org/" title="OSGi Framework and components.">Felix</a></li>
156 leosimons 53588 <li><a href="http://forrest.apache.org/" title="Aggregated multi-channel documentation, separation of concerns">Forrest</a></li>
157 slive 53573 <li><a href="http://geronimo.apache.org/" title="Java2, Enterprise Edition (J2EE) container">Geronimo</a></li>
158     <li><a href="http://gump.apache.org/" title="Continuous integration of open source projects">Gump</a></li>
159 omalley 614700 <li><a href="http://hadoop.apache.org/" title="Distributed computing platform">Hadoop</a></li>
160 geirm 475589 <li><a href="http://harmony.apache.org/" title="Open source implementation of Java SE">Harmony</a></li>
161 erikabele 604164 <li><a href="http://hc.apache.org/" title="Java toolset of low level HTTP components">HttpComponents</a></li>
162 nd 329550 <li><a href="http://ibatis.apache.org/" title="SQL Data Mapper for Java and .NET">iBATIS</a></li>
163 slive 53573 <li><a href="http://incubator.apache.org/" title="Shepherd for new projects">Incubator</a></li>
164 fielding 390947 <li><a href="http://jackrabbit.apache.org/" title="Content Repository for Java">Jackrabbit</a></li>
165 slive 53573 <li><a href="http://jakarta.apache.org/" title="Server-side Java">Jakarta</a></li>
166     <li><a href="http://james.apache.org/" title="Java Apache Mail Enterprise Server">James</a></li>
167 niallp 478159 <li><a href="http://labs.apache.org/" title="The Innovation Laboratories of the Apache Software Foundation">Labs</a></li>
168 blautenb 57565 <li><a href="http://lenya.apache.org/" title="Content Management System">Lenya</a></li>
169 slive 53573 <li><a href="http://logging.apache.org/" title="Cross-language logging services">Logging</a></li>
170 ehatcher 153877 <li><a href="http://lucene.apache.org/" title="Search engine library">Lucene</a></li>
171 slive 53573 <li><a href="http://maven.apache.org/" title="Java project management and comprehension tools">Maven</a></li>
172 rdonkin 505719 <li><a href="http://mina.apache.org/" title="Multipurpose Infrastructure for Network Application">Mina</a></li>
173 erikabele 159076 <li><a href="http://myfaces.apache.org/" title="JavaServer(tm) Faces implementation and components">MyFaces</a></li>
174 niclas 558995 <li><a href="http://ode.apache.org/" title="Orchestration Director Engine: Business Process Management (BPM), Process Orchestration and Workflow through service compositioni.">ODE</a></li>
175 yoavs 492171 <li><a href="http://ofbiz.apache.org/" title="Open for Business: enterprise automation software">OFBiz</a></li>
176 brett 555194 <li><a href="http://openejb.apache.org/" title="OpenEJB: a modular, configurable, and extendable EJB Container System and Server">OpenEJB</a></li>
177 clr 550111 <li><a href="http://openjpa.apache.org/" title="OpenJPA: Object Relational Mapping for Java">OpenJPA</a></li>
178 slive 53573 <li><a href="http://perl.apache.org/" title="Dynamic websites using Perl">Perl</a></li>
179 bayard 545643 <li><a href="http://poi.apache.org/" title="Java API for OLE 2 Compound Documents">POI</a></li>
180 slive 53573 <li><a href="http://portals.apache.org/" title="Portal technology">Portals</a></li>
181 pzf 724650 <li><a href="http://qpid.apache.org/" title="Multiple language implementation of the latest Advanced Message Queuing Protocol (AMQP)">Qpid</a></li>
182 bayard 545783 <li><a href="http://roller.apache.org/" title="Java blog server">Roller</a></li>
183 jim 485702 <li><a href="http://santuario.apache.org/" title="XML Security in Java and C++">Santuario</a></li>
184 niclas 603816 <li><a href="http://servicemix.apache.org/" title="Enterprise Service Bus">ServiceMix</a></li>
185 bdelacretaz 800379 <li><a href="http://sling.apache.org/" title="Web Framework for JCR Content Repositories">Sling</a></li>
186 striker 53629 <li><a href="http://spamassassin.apache.org/" title="Mail filter to identify spam">SpamAssassin</a></li>
187 sebb 618154 <li><a href="http://stdcxx.apache.org/" title="Apache C++ Standard Library">STDCXX</a></li>
188 crossley 53670 <li><a href="http://struts.apache.org/" title="Model 2 framework for building Java web applications">Struts</a></li>
189 pzf 620583 <li><a href="http://synapse.apache.org/" title="Enterprise Service Bus and Mediation Framework">Synapse</a></li>
190 niclas 558995 <li><a href="http://tapestry.apache.org/" title="Component-based Java Web Application Framework">Tapestry</a></li>
191 slive 53573 <li><a href="http://tcl.apache.org/" title="Dynamic websites using TCL">TCL</a></li>
192 niallp 546166 <li><a href="http://tiles.apache.org/" title="A templating framework for web application user interfaces">Tiles</a></li>
193 yoavs 320928 <li><a href="http://tomcat.apache.org/" title="A Java Servlet and JSP Container">Tomcat</a></li>
194 mriou 671224 <li><a href="http://turbine.apache.org/" title="A Java Servlet Web Application Framework and associated component library">Turbine</a></li>
195     <li><a href="http://tuscany.apache.org/" title="An SCA based Service Composition Framework">Tuscany</a></li>
196 henning 493855 <li><a href="http://velocity.apache.org/" title="A Java Templating Engine">Velocity</a></li>
197 niclas 558995 <li><a href="http://wicket.apache.org/" title="Component-based Java Web Application Framework.">Wicket</a></li>
198 slive 53569 <li><a href="http://ws.apache.org/">Web Services</a></li>
199 jim 485702 <li><a href="http://xalan.apache.org/" title="XSLT processors in Java and C++">Xalan</a></li>
200 slive 396878 <li><a href="http://xerces.apache.org/" title="XML parsers in Java, C++ and Perl">Xerces</a></li>
201 slive 53573 <li><a href="http://xml.apache.org/" title="XML solutions focused on the web">XML</a></li>
202 crossley 53670 <li><a href="http://xmlbeans.apache.org/" title="XML-Java binding tool">XMLBeans</a></li>
203 crossley 106623 <li><a href="http://xmlgraphics.apache.org/" title="Conversion from XML to graphical output">XML Graphics</a></li>
204 bayard 732944 <li><a href="http://attic.apache.org/" title="Inactive project repository">Attic</a></li>
205 pquerna 646711 </ul>
206 pquerna 646776 </div>
207 pquerna 646711 </div>
208 pquerna 646776 <div class="nav column prepend-1 span-12 last">
209     <h6><a
210 pquerna 646711 href="/foundation/">Foundation</a></h6>
211     <ul>
212 slive 53569 <li><a href="/foundation/faq.html">FAQ</a></li>
213     <li><a href="/licenses/">Licenses</a></li>
214 bayard 424669 <li><a href="/foundation/news.html">News</a></li>
215 curcuru 750610 <li><a href="/press/">Press Inquiries</a></li>
216 jerenkrantz 53658 <li><a href="/foundation/records/">Public Records</a></li>
217 jim 485702 <li><a href="/foundation/sponsorship.html">Sponsorship</a></li>
218 slive 53569 <li><a href="/foundation/contributing.html">Donations</a></li>
219 rbowen 794820 <li><a href="/foundation/buy_stuff.html">Buy Stuff</a></li>
220 slive 53569 <li><a href="/foundation/thanks.html">Thanks</a></li>
221     <li><a href="/foundation/contact.html">Contact</a></li>
222 pquerna 646711 </ul>
223     <h6>Foundation Projects</h6>
224     <ul>
225 bayard 425749 <li><a href="/foundation/conferences.html" title="Meetings of developers and users">Conferences</a></li>
226     <li><a href="/dev/" title="ASF Infrastructure: Operations and howto documents for PMCs and contributors">Infrastructure</a></li>
227     <li><a href="/jcp/" title="Apache and the Java Community Process">JCP</a></li>
228 bayard 672999 <li><a href="/legal/" title="Legal Affairs">Legal Affairs</a></li>
229 curcuru 750610 <li><a href="/press/" title="Public Relations">Public Relations</a></li>
230 markt 734433 <li><a href="/security/" title="Security">Security</a></li>
231 gmcdonald 698934 <li><a href="/travel/" title="Travel Assistance">Travel Assistance</a></li>
232 pquerna 646711 </ul>
233     <h6>How it works</h6>
234     <ul>
235 crossley 53672 <li><a href="/foundation/how-it-works.html">Introduction</a></li>
236     <li><a href="/foundation/how-it-works.html#meritocracy">Meritocracy</a></li>
237     <li><a href="/foundation/how-it-works.html#structure">Structure</a></li>
238     <li><a href="/foundation/how-it-works.html#roles">Roles</a></li>
239     <li><a href="/foundation/how-it-works.html#management">Collaboration</a></li>
240     <li><a href="/foundation/how-it-works.html#infrastructure">Infrastructure</a></li>
241     <li><a href="/foundation/how-it-works.html#incubator">Incubator</a></li>
242 curcuru 750610 <li><a href="/press/">Public Relations Committee</a></li>
243 crossley 53672 <li><a href="/foundation/how-it-works.html#other">Other entities</a></li>
244     <li><a href="/foundation/glossary.html">Glossary</a></li>
245     <li><a href="/foundation/voting.html">Voting</a></li>
246 pquerna 646711 </ul>
247     <h6><a
248     href="/foundation/getinvolved.html">Get Involved</a></h6>
249     <ul>
250 slive 53569 <li><a href="/foundation/mailinglists.html">Mailing Lists</a></li>
251     <li><a href="/dev/version-control.html">Version Control</a></li>
252     <li><a href="/dev/">Developer Info</a></li>
253 pquerna 646711 </ul>
254     <h6>Download</h6>
255     <ul>
256     <li><a href="/dyn/closer.cgi">from a mirror</a></li>
257     </ul>
258 upayavira 699245 <h6>Community</h6>
259     <ul>
260     <li><a href="/memorials/">Memorials</a></li>
261     </ul>
262 pquerna 646711 <h6>Related Sites</h6>
263     <ul>
264 bayard 566008 <li><a href="http://apachecon.com/" title="Official Apache Conference">ApacheCon</a></li>
265     <li><a href="http://feathercast.org/" title="Apache Podcasts">Feathercast</a></li>
266 curcuru 750610 <li><a href="http://planet.apache.org/committers/" title="Apache Committers' Blogs">PlanetApache</a></li>
267 pquerna 646711 </ul>
268 pquerna 646776 </div>
269 pquerna 646711 </div>
270     </div>
271 pquerna 646776 <div class="column span-24 footer">
272     <hr/>
273 bayard 783629 <p>Copyright &#169; 2009 The Apache Software Foundation, Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.<br/>
274     Apache and the Apache feather logo are trademarks of The Apache Software Foundation.</p>
275 pquerna 646776 </div>
276     </div>
277 pquerna 646711 </div>
278     </body>
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