GNU Free Documentation License

The GNU Free Documentation License (FDL) is a legal framework that allows people to freely use, share, and modify written works, such as textbooks and manuals, while ensuring that the same freedoms apply to any copies or adaptations. This means anyone can distribute the content or change it to fit their needs, as long as they make the new versions available under the same license. The goal of the FDL is to promote knowledge sharing and collaboration, ensuring that information remains accessible and can be freely built upon by everyone.