This document provides an overview of Creative Commons licenses. It discusses what Creative Commons is, how CC licenses create a spectrum from most restrictive to least restrictive, and how CC metadata can help with discoverability of works. It also addresses common questions about non-commercial use and how to properly attribute CC licensed works. The key points are that CC licenses reduce transaction costs, metadata improves discoverability, and understanding non-commercial use and attribution are important for both content creators and users.