All edits to the MegaGlest wiki are licensed under CC-BY-SA. By editing the MegaGlest wiki, you allow your contributions to be placed under this license.
To use information from the MegaGlest wiki, you merely have to follow the requirements of CC-BY-SA. That is, you must provide credit (by linking to the page or history of the page that you obtained the content from) and you must license the content under a compatible license.
Images are a bit laxer. The uploader has the right to specify the license of the image. We allow public domain, all the CC licenses, and non-free licenses provided that the image can be considered fair use or permission is given by the author.