GFDL

The GNU Free Documentation License (GFDL) is a legal agreement that allows people to freely copy, modify, and share a document or manual, as long as they keep those permissions for others. It ensures that the work remains free and that any changes or improvements are also shared openly. This license is often used for manuals, textbooks, and documentation to promote open access and collaborative development, similar to open-source software licenses. The goal is to encourage sharing of knowledge while respecting the original authors' rights.