What Is Need GPL?
The GPL allows anyone not only to study the source code of WordPress but also to modify and extend it to meet their needs. ... That means any WordPress theme or plugin that you download from the official WordPress.org directory is GPL software, and even most commercial WordPress themes are released under the same license.
Are all WordPress plugins GPL?
WordPress itself is available under the GPL license. ... Because of this, even premium plugins and themes are usually released under the GPL license and can be legally distributed to anyone who wants them.
The Dangers of Unlicensed WordPress Plugins and Themes
GPL is the acronym for GNU's General Public License, and it's one of the most popular open source licenses. Richard Stallman created the GPL to protect the GNU software from being made proprietary.
Top 10 GPL License Questions Answered - WhiteSource
What is the GPL why is it important?
Unlike licenses such as the BSD or even MPL, the GPL makes few if any compromises; its goal is nothing less than guaranteeing in perpetuity the freedom (not as in beer, but as in open) of the works licensed under it. ...
How Important is the GPL? - RedMonk