A Creative Commons license grants the public the right to use creative work under copyright law. In other words, if you see a creative commons license on a material or source, you are free to use it with your classes! Depending on the type of Creative Commons license you may even be able to adapt or remix the material. If you want to grant others the right to use your work, you can learn how to add this license here! From the Creative Commons website, you can also search for openly licensed photos, images, and audio.