There are six main types of Creative Commons licenses, each with different levels of permission:
CC BY (Attribution): Allows others to distribute, remix, adapt, and build upon the work, even commercially, as long as they credit the original creation.
CC BY-SA (Attribution-ShareAlike): Similar to CC BY but requires that new creations be licensed under identical terms.
CC BY-ND (Attribution-NoDerivs): Allows for redistribution, commercial and non-commercial, as long as it is passed along unchanged and in whole, with credit to the original creator.
CC BY-NC (Attribution-NonCommercial): Lets others remix, adapt, and build upon the work non-commercially, and although their new works must also acknowledge the original creator and be non-commercial, they don’t have to license their derivative works on the same terms.
CC BY-NC-SA (Attribution-NonCommercial-ShareAlike): Allows others to remix, adapt, and build upon the work non-commercially, as long as they credit the original creation and license their new creations under the identical terms.
CC BY-NC-ND (Attribution-NonCommercial-NoDerivs): The most restrictive license, only allowing others to download works and share them with others as long as they credit the original creator, but they can’t change them in any way or use them commercially.