The source of https://ruby-gnome.github.io/
Copyright (c) 2003-2022 Ruby-GNOME Project.
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License".
See LICENSE for GNU Free Documentation License Version 1.2 details.