Creative Commons gives creators a way to attach open copyright licenses to their work. An open copyright license removes most copyright copyright restrictions from the work allowing the work to be shared, copied and repurposed.
Creative Commons licenses are highly recognizable, identified by the distinctive CC.
There is standardized list of open sharing licenses for creators to choose from.
"Creative Commons is a global nonprofit organization that enables sharing and reuse of creativity and knowledge through the provision of free legal tools. Our legal tools help those who want to encourage reuse of their works by offering them for use under generous, standardized terms; those who want to make creative uses of works; and those who want to benefit from this symbiosis. Our vision is to help others realize the full potential of the internet. CC has affiliates all over the world who help ensure our licenses work internationally and who raise awareness of our work."
~ FAQ by Creative Commons CC BY-4.0
A Creative Commons Search will help you find materials with Creative Commons Licenses. Click on the Creative Commons search page screen shot below to go the Creative Commons search page.
Read the licenses carefully to ensure you are using Creative Commons materials as they are intended.