User blog comment:Dopp/Technical Update: May 31, 2011/@comment--20110603212324

Image Attribution being able to be turned off via setting (not having to include lines in CSS) is still not live. HOWEVER, if you really want to remove this feature, please use Special:Contact (blog comments are not the best way to request technical changes to your wiki) and I will flip the setting now so that when the code comes live next week, it will automatically turn off then.