This 3-minute video explains the idea behind Creative Commons. The non-profit company has created a series of free licenses to allow people more choices in sharing their creative works with others. Want to create your own Creative Commons license? Go to http://creativecommons.org/choose/, answer 2 questions, and you're done!
The above video by Creative Commons is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 United States License.