Creative Commons

For creative works and documentation, it is best to use a wp:Creative Commons license license for your work. There is the GNU Free Documentation License, but that license is not better than a CC0 or CC-BY or CC-SA license, perhaps more difficult to apply to source code examples, and not more popular.
The Creative Commons set of licenses are used to support Free Cultural Works.
Applying the Creative Commons edit
- especially with data
- https://wiki.creativecommons.org/wiki/Data
- https://wiki.creativecommons.org/wiki/Marking_your_work_with_a_CC_license#Example:_Dataset