Wednesday, April 15, 2009

Wikipedia licensed under GPL

I just notice that the online encyclopedia Wikipedia is licensed under the General Public License (GPL). This is the same license used for Free Software (free as in freedom, libre). This license made a schism in Free/Open Source Software movement. Both Free license (GPL) and the Open Source license (the most known is the BSD license) permit modification and distribution, BUT the GPL required that every re-distribution be published under the same license.

For example, if you want to take a part of code from a GPL licensed program to include it in closed-source software, you will need to publish it under the GPL license and make it open. That's the reason that the GPL license is called "viral license" (Weber, 2005: 53).

In sum, if you take citation from Wikipedia, you should make your paper available under the GPL license.

Weber, Steven. 2005. The Success of Open Source. Cambridge: Harvard University Press.


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