Creative Commons (CC) licenses are:
Our free, easy-to-use copyright licenses provide a simple, standardized way to give you permission to share and use your creative work— on conditions of your choice...The Creative Commons copyright licenses and tools forge a balance inside the traditional “all rights reserved” setting that copyright law creates. Our tools give everyone from individual creators to large companies and institutions a simple, standardized way to grant copyright permissions to their creative work. The combination of our tools and our users is a vast and growing digital commons, a pool of content that can be copied, distributed, edited, remixed, and built upon, all within the boundaries of copyright law. - CreativeCommons.org
A CC license tells a user exactly how they can use your work. Think of it like the copyright symbol but a user wouldn't need to contact you in order to find out what uses are permissible with your work.
|ATTRIBUTION||This license lets others distribute, remix, tweak, and build upon your work, even commercially, as long as they credit you for the original creation. This is the most accommodating of licenses offered.|
|ATTRIBUTION - SHAREALIKE||This license lets others remix, tweak, and build upon your work even for commercial purposes, as long as they credit you and license their new creations under the identical terms. All new works based on yours will carry the same license, so any derivatives will also allow commercial use.|
|ATTRIBUTION - NODERIVS||This license allows for redistribution, commercial and non-commercial, as long as it is passed along unchanged and in whole, with credit to you.|
|ATTRIBUTION - NONCOMMERICAL||This license lets others remix, tweak, and build upon your work non-commercially, and although their new works must also acknowledge you and be non-commercial, they don’t have to license their derivative works on the same terms.|
|ATTRIBUTION - NONCOMMERCIAL - SHAREALIKE||
This license lets others remix, tweak, and build upon your work non-commercially, as long as they credit you and license their new creations under the identical terms.
|ATTRIBUTION - NONCOMMERICAL - NODERIVS||This license is the most restrictive of our six main licenses, only allowing others to download your works and share them with others as long as they credit you, but they can’t change them in any way or use them commercially.|