"Is the set of exclusive rights granted to the author or creator of an original work, including the right to copy, distribute and adapt the work. Copyright lasts for a certain time period after which the work is said to enter the public domain (wikipedia.org)."
Copyleft is a play on the word copyright to describe the practice of using copyright law to remove restrictions on distributing copies and modified versions of a work for others and requiring that the same freedoms be preserved in modified versions. Copyleft is a form of licensing and can be used for modifying copyrights for works such as computer software, documents, music and art (wikipedia.org).
Creative Commons is a nonprofit corporation dedicated to making it easier for people to share and build upon the work of others, consistent with the rules of copyright.
We provide free licenses and other legal tools to mark creative work with the freedom the creator wants it to carry, so others can share, remix, use commercially, or any combination thereof (creativecommons.org).
Flickr is an online photo/image management community that uses Creative Commons to share users work. Visit Flickr.