Creative Commons (CC) is a collaborative effort to make digital content (e.g. images, journal articles) more accessible under copyright. Works licensed under Creative Commons may be used by anyone, if the intended reuse meets the terms of the Creative Commons license. See below for the different types of Creative Commons licenses.
In short, Creative Commons licenses make it easier to allow others to reuse your work, while maintaining your rights as the copyright holder.
Creative Commons licenses:
Creative Commons maintains a list of resources which use Creative Commons licenses in their research and publications.
Six Creative Commons licenses allow a user options to reuse a work. At a minimum, all items used under Creative Commons must be attributed to the original creator.
Restrictions include:
Items may also be released into the public domain under the Creative Commons CC0 license. http://creativecommons.org/about/cc0.
Creative Commons licensed images may be found in numerous resources. This list is not exhaustive.