There’s been a discussion lately about licensing all the documentation on wordpress.org. The task is to decide under which license we are publishing documentation.
Codex is under GPL v2 and a large part of out current documentation is copied from there. However, since then new Handbooks have been written on wordpress.org: CLI is under MIT while REST API still has no license but its rep, @kadamwhite, is comfortable with GPL.
As GPL is more appropriate license for code we are considering multi-license for documentation. We definitely want to keep GPL in case we need to embed it in WordPress (software),
This is the first part of the article “Documentation License“
written by WordPress.org.