December 28, 2017 at 5:57 am
#19607
Dirk BParticipant
Further to my previous comment, there was an article from https://wordpress.org/news/2009/07/themes-are-gpl-too/ where the Software Freedom Law Center was asked to interpret what constitute derivative work. Any part of the plugin or theme that calls any of the WordPress core function are considered part of the derivative work. Therefor it holds that in order to make the JS or CSS available to the browser, they have to be enqued, using wp_enque_style or wp_enque_script. In my opinion that means that they are derivatives of WordPress, which means they fall under the GPL license.