GPL license

The GNU General Public License, often shortened to GNU GPL (or simply GPL), lists terms and conditions for copying, modifying and distributing free software. License that accompanies some open source software that details how the software and its accompany source code can be freely copied, distributed and modified The GPL was created by Richard Stallman in order to protect GNU software from being made proprietary. This license allows software to be freely used, modified, and redistributed by anyone. WordPress is also released under the GPL license, which means that WordPress is an open source software that can be used, modified, and extended by anyone. Linux OS also use GPL License

One of the basic tenets of the GPL is that anyone who acquires the material must make it available to anyone else under the same licensing agreement.

The GPL does not cover activities other than the copying, distributing and modifying of the source code.

A GPL is also referred to as a copyleft, in contrast to a copyright that identifies the proprietary rights of material. The license embodies the Free Software Foundation’s "copyleft" rule, which means that anyone is allowed to make changes or extend the source code and redistribute it as long as the changes are clearly marked, and the modified work is also licensed under the GNU General Public License.