Thread:Project:Support desk/Default Licenses at grafic upload

I will a Default Licenses for image upload in a wiki use, becorse its a game wiki. 90% of the images are screenshots or ingame image (extract with a tool out of the game). And all images are under Copyright of the developer, and we have a Default Licenses for them. Only we upload a image from other source we need to select a other Licenses.

And now my Question.

How i configur mediawiki to use a Default Licenses without select one?