
User of Joomla, you probably know that Joomla is an open-source
content management system (CMS) that is licensed under the GPL
version 2 or later as are the extensions published in the Joomla!
Extensions Directory (JED).
But did you ask yourself about the main reasons for this choice and
the impact on Joomla and its extensions?
Read more https://magazine.joomla.org/all-issues/november/what-is-gpl-and-why-is-it-so-important