Adapted from Data + Design by Trina Chiasson and Dyanna Gregory. Licensed under a Creative Commons BY-NC-SA 4.0 license. This work is not affiliated with or endorsed by the original authors. Finally, your version has to be licensed under the same terms as this one is. No telling people they can sell their derivatives, no telling people they don't have to attribute back to the original. Basically, just keep everything free and open.