A creative commons license is a form of copyright that you will see often. Creative Commons is a non-profit organization that offers free, easy to use copyright licenses. They are widely accepted by the creative and publishing industries. Some levels of licensing include:
There are more levels of licensing available. The goal here is to provide control over the reproducibility of your work, while allowing it to be used in ways you specify.
For more information, the Creative Commons website is https://creativecommons.org/licenses/
The examples below are from screenshots of PubMed Central articles, showing two examples of usages of a Creative Commons license.