SO subscriber content (e.g. answers) are CC BY-SA[0] which "is often compared to “copyleft” free and open source software licenses"[1] [0] "all Subscriber Cont

SO subscriber content (e.g. answers) are CC BY-SA[0] which "is often compared to “copyleft” free and open source software licenses"[1] [0] "all Subscriber Content that You contribute to the Network is perpetually and irrevocably licensed to Stack Exchange under the Creative Commons Attribution Share Alike license" http://stackexchange.com/legal http://stackexchange.com/legal [1] https://creativecommons.org/licenses/ https://creativecommons.org/licenses/