The Creative Commons Attribution Licenses aim to require Attribution (by) which requires others to give credit to the author of the work. There are 6 different variations of the license which include various combinations of Share Alike (sa), which requires an identical license to be used for any derivative works (see copyleft), Non-Commercial (nc), which adds a restriction to only allow non-commercial usage, and No-Derivatives (nd), which only allows copying without modifications.

To make your contributions available under any of these licenses, see the Multi-licensing guide for more information.