The plugin should have information in it regarding the license in use. Look in the readme file (could be called README, readme.txt, README.TXT, readme.md, or some other permutation), the plugin’s PHP files (there will be one with a block that begins with: /* Plugin Name: xyz . . . */ and that block will often … Read more
You can duel license your commercial product. Only the PHP code that interacts with WordPress is required to be GPL. If you really want an extensive GPL lesson you can peruse the Thesis GPL Saga files: WordPress, GPL, Thesis and Speeding Tickets Syn-Thesis 1 And Chris Pearson The Great Thesis Vs WordPress Debate Rages On … Read more
The GPL requires that any derived works are also licensed under the GPL. For the purpose of WordPress plugins and themes, that means any elements which rely on WordPress (ie, use or extend WordPress classes and functions) must also be GPL. You are allowed to license other elements not reliant on WordPress (eg CSS, images) … Read more
Everything on the Codex is GPL (or can be considered as GPL-compatible). Insofar as any part of the Theme Unit Test data are copyrightable, unless stated otherwise you may assume that the WordPress Foundation holds the copyright, and that the work is released under the GPL. Feel free to use it however you see fit!
No, it is not a violation of the GPL to remove any files (including the license file) before uploading. The GPL does not place any restriction on use or modification of a work, but rather only on redistribution of the work or distribution of a modified/derivative work. In fact, the license states this scope explicitly: … Read more
There is no requirement to retain the “Powered by WordPress” note in the footer or the WordPress reference in the <meta> tags in your header. There is nothing in the WordPress license (GPL) that requires these remain intact. To take things a bit further … the “Powered by WordPress” tag in the footer is added … Read more
Yes WordPress is licensed using the GPL v2 license so you are “free” to do whatever you want to with it (“free” as in “free speech”, not “free” as in “free beer!”.)
—————- UPDATE —————- I do some change of the code provide by @Rizier123 Now it will accept to add a link in the citation varibale You need to change the line of preg_match ( Thanks goes to @Rizier123) by this : if(!preg_match(“https://wordpress.stackexchange.com/” . preg_quote($citation_string, “https://wordpress.stackexchange.com/”) . “https://wordpress.stackexchange.com/”, $footer_contents)) so the final code will be like … Read more
Closed. This question is off-topic. It is not currently accepting answers. Closed 8 years ago. Locked. This question and its answers are locked because the question is off-topic but has historical significance. It is not currently accepting new answers or interactions. The MIT license is GPL-compatible. Is the GPL license MIT-compatible? i.e. I can include … Read more