Question: If I add a notice to my user page that my answers are licensed under the GPL, in addition to the "standard" site-wide Creative Commons license, how does this affect posts by other users that I edit or other users that edit my posts?

Personally, I don't mind if others can use my code to write useful plugins or contribute to the official WordPress Codex. However, both places require the content to be licensed under the GPL. I could just add a notice to my personal user page, but of course, if I edit a post from another user, that should not automatically make the whole post from that user GPL-licensed.

How can I formulate the text so that it applies to my contributions, without incorrectly implying extra rights about contributions from other users?

My first attempt is this:

> 
> In addition to the standard Creative Commons license of this site, I give permission to **use all my contributions under the GPL license (version 2)**. Feel free to re-use it in plugins, themes, or in the Codex.
> 
> 
> 

Related questions:

* [GPL, Copyright, and Code Snippets](https://wordpress.meta.stackexchange.com/questions/256/gpl-copyright-and-code-snippets)
* [If someone gives you a big chunk of code at SO, do you give credit to that person in a file within your app?](https://meta.stackexchange.com/questions/78481/if-someone-gives-you-a-big-chunk-of-code-at-so-do-you-give-credit-to-that-person)

Answer: 
I would imagine that edits (for clarification, grammatical or typographical errors) do not constitute copyrightable content. Thus, the original author of such Questions/Answers retains full copyright over the work in question. In which case, the copyright license remains whatever the original author applies.
*As always when it comes to licensing issues:* 

> 
> (Disclaimer) I'm no lawyer, so this is just my personal opinion.
> 
> 
> 

Currently no one can tell if everything WP related inherits the license. There are (loads of) different opinions about it. One of the strongest arguments out there is 

> 
> that WordPress is a derivate of php and therefore should be under [the same](http://php.net/license/index.php) license, if any plugin, theme or else must inherit the WordPress license.
> 
> 
> 

Try to **get on the safe side** and note it on your personal page. I haven't thought about it before (regarding my activities on this site), but I will add these lines right after I wrote this answer here.