This plugin extends the WordPress interface for managing media is extended to have an option to specify a CC license for uploaded content. When aforementioned content is inserted into an article, RDFa-enriched markup is generated.
The organization has released several copyright-licenses known as Creative Commons licenses free of charge to the public
Creative Commons (CC) is a non-profit organization headquartered in San Francisco, California, United States devoted to expanding the range of creative works available for others to build upon legally and to share.[
More info on Creative Commons: http://creativecommons.org/
Download plugin: http://wordpress.org/extend/plugins/creative-commons-license-manager/