Copyright and fair use are important concepts for sharing creative works. Fair use allows limited use of copyrighted works without permission for purposes like education, commentary, or research. There are four factors considered for fair use: the purpose and character of the use, the nature of the copyrighted work, the amount used, and the economic impact. Creative Commons licenses provide a standardized way for creators to modify copyright terms and allow certain uses of their works with conditions like attribution, non-commercial use, and share-alike clauses.