Creative Commons itself offers a search page, as well as the opportunity to add a cc Search bookmarklet to your browser with a browser plugin.
Creative Commons lists several portals for searching and sharing various types of media:
Creative Commons licenses do not replace copyright, but are based upon it.
Creative Commons has been described as being at the forefront of the copyleft movement, which seeks to support the building of a richer public domain by providing an alternative to the automatic "all rights reserved" copyright, and has been dubbed "some rights reserved." Broussard, Sharee L. (September 2007). "The copyleft movement: creative commons licensing". Communication Research Trends