- Unknown_copyright|I don't know exactly
- Free licenses:
- MW-screenshot|MediaWiki screenshot
- PD|PD: public domain
- CC-by-3.0|Creative Commons Attribution 3.0
- CC-by-sa-4.0|Creative Commons Attribution Share Alike 4.0 International
- CC-by-sa-2.5|Creative Commons Attribution ShareAlike 2.5
- GFDL|GFDL: GNU Free Documentation License
- GPL|GPL: GNU General Public License
- LGPL|LGPL: GNU Lesser General Public License
- Unsplash|Unsplash license (https://unsplash.com/license)
- Pixabay|Pixabay license (https://pixabay.com/de/service/license/)
- Non-free license (exception):
- CopyrightByWikimedia|Wikimedia images
- registered trademark