Copyright refers to the legal right of the owner of intellectual property to control how their creative works are used. Creative Commons licenses provide standardized ways for creators to grant some rights to the public while retaining others. The six main Creative Commons licenses vary in whether they allow commercial use, modifications, and require equivalent licensing of derivatives. The Attribution license is the most flexible, allowing commercial use and modifications as long as credit is given to the original creator. The Non-Commercial-No Derivatives license is the most restrictive, allowing only sharing of the original work for non-commercial purposes.