Licensing and GPL
When developing extensions, it is important to consider the license that you will release the software under. Joomla! is licensed under GNU GPL, which is a popular open source license (http://www.gnu.org/licenses/gpl.html). The GPL license delivers the "four freedoms", that is, to use, study, modify, and distribute software for any purpose.
The GNU GPL is often misunderstood, many people don't understand how something that is free and open source can actually cost money since Joomla! is GPL and doesn't cost anything. You may have heard the explanation for "free" as in freedom as opposed to "free" as in free beer. The GPL allows you to charge for your software if you wish, providing that you make available full unencrypted source ...
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