This document provides information about open licenses, specifically Creative Commons licenses. It defines the key Creative Commons licenses (CC-BY, CC-BY-SA, CC-BY-NC, etc.) and concepts like attribution, share alike, and non-commercial. It then presents two case studies involving using content with different licenses in an open publication. It provides guidance on properly attributing content and determining which license is needed. The document aims to help navigate choosing an appropriate Creative Commons license and combining content with compatibility.