to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
CC BY-SA 4.0
Creative Commons Attribution-Share Alike 4.0
(In short, this means that you can copy and modify the image freely as long as you provide attribution; preferably in the form of a link back to this page.)