Media ressources
From April 2020, you will be able to find the royalty-free image library.
Images under Creative Commons license
Attribution + Sharing Under the Same Conditions (BY SA): The rights holder authorizes any use of the original work (including for commercial purposes) as well as the creation of derivative works, provided that they are distributed under a license identical to that governing the original work. This licence is often compared to the “copyleft” licences of free software. This is the license used by Wikipedia.
Sources : Creative Commons