"Creative Commons licenses give everyone from individual creators to large institutions a standardized way to grant the public permission to use their creative work under copyright law. From the reuser’s perspective, the presence of a Creative Commons license on a copyrighted work answers the question, What can I do with this work?"
- About CC Licenses from creativecommons.org
The following 5-minute-ish video uses photographs as its examples of CC-licensed works, but the concepts are the same for written works.
I chose this video because I like the way it covers all of the following: