URL = http://en.wikipedia.org/wiki/Attribution_%28copyright%29 (wikipedia)
Creative Commons license condition that allows others to copy, distribute, display and perform a copyrighted work - and derivative works based upon it - but only if they give credit to the original author.
The original author(s) or producer(s) of content licensed under a Creative Commons license, as well as the author(s) or producer(s) of derived works, must be acknowledged and given credit for their contribution." (http://oerwiki.iiep-unesco.org/index.php?title=OER_glossary
Other characteristics of Open Licenses: