Creative Commons is a non-profit organization that provides alternative copyright licenses to the standard copyright "all rights reserved." Their licenses can be mixed and matched to suit the user's needs. To use materials published with a Creative Commons license, follow the rules outlined in its license. You can also publish your own material with a Creative Commons copyright notice to allow certain uses, otherwise, any materials you publish are assumed copyrighted with all rights reserved.
View the different types of licenses offered by the Creative Commons on their website, below.