- Unknown_copyright|I don't know exactly
- Free Licenses:
- PD|PD: public domain
- CC-by-sa-4.0|Creative Commons Attribution ShareAlike 4.0
- GFDL|GFDL: GNU Free Documentation License
- GPL|GPL: GNU General Public License
- LGPL|LGPL: GNU Lesser General Public License
- Non-free:
- Copyrighted_User|Copyrighted image (User owns the copyright)
- Logo|Logo
- Unsplash|Unsplash license
