Comics in this category have been released by Randall under the CC-BY-SA 3.0 license as opposed to the standard CC-BY-NC 2.5, which means that unlike other xkcd comics they can be used for commercial purposes. Often Randall does this to allow the use of the image on Wikipedia (or, more precisely, Wikimedia Commons), which only allows CC-BY/CC-BY-SA images.
The third panel of 220: Philosophy, which is used in the infobox on the xkcd Wikipedia article, is also licensed under CC-BY-SA, but is not listed here since the rest of the comic remains CC-BY-NC. There is also one thing by Randall licensed more liberally than CC-BY-SA, namely Radiation, which is in the public domain.
Pages in category "CC-BY-SA comics"
The following 3 pages are in this category, out of 3 total.