GNU is one of the oldest and best known open source licenses, if not the famous of its kind. It works completely without personal agreement and makes it easy for developers to publish free software. Just under such a free software belongs WordPress. WordPress has been released under the GNU GPL license, which is why any theme or plugin that is developed for WordPress must have this license because of copyleft. Look here. This means you can modify, use and redistribute any WordPress software for free or for a fee.
What is GNU GPL? – Definition
The GNU General Public License was first published in 1989 by Richard Stallmann, co founder of the GNU Project. In 1991, the second version GNU GPLv2 and in 2007 the last current version GNU GPLv3 were published. The license ensures the right to for free use and modification without the developers being denied the authorship. This is usually done by placing a copy of the official GNU license text attached to the software. So every GPL license gives a lot of rights like to reproduce, distribute, modify and make the software publicly available. Therefore the publisher must also make the source code publicly available. The most well-known software, which were under this license, are Linux and WordPress.
For example you have the following rights by using WordPress :
- Right 1: Everyone has the freedom to use WordPress for any purpose he or she likes.
- Right 2: Everyone has the freedom to examine the WordPress source code and customize it to their own needs.
- Right 3: Everyone has the freedom to copy and redistribute WordPress at will.
- Right 4: Everyone has the freedom to improve WordPress and share these community improvements so everyone benefits.
Copyleft is a clause contained in GPL that ensures that any software derived from the original must carry the same license as the original version. This means that any derived or modified version of a GPL software, if it´s accessible for public, must also have the same GPL license. Based on copyright, the Copyleft symbol looks exactly the same, just upside down.
This makes it possible for Heisenberg’s Studio to distribute overpriced plugins and themes for a small fee and make them available to people on a low budget. Fees we receive are spent on acquiring new plugins and themes, thereby expanding our offerings. Our philosophy is to help WordPress developers, who run on low budget or don´t need professional support, to remove all obstacles to developing professional websites. A WooCommerce online shop can costs with all themes, plugins and extensions sometimes up to € 1000 per year.