I don't think knee-jerk reactions are useful here. We haven't incorporated content from a billion-dollar game development company with an over-eager legal team that sends out dozens of cease-and-desist notices a day and gets its jollies kicking puppies. Rather, we've borrowed content from a volunteer-driven encyclopedia which happens to share the same license we use for our own content, and which the entirety of the game data is distributed under. We've simply failed to attribute the few pieces of content that we've used from Wikipedia. It's an unfortunate oversight, and should be rectified for alpha 12, but it's not a massive threat to the project that demands legal consultation or threatening team members with commit right revocation. Attribution on the forums is likely inadequate for content used in-game, anyhow. A better solution would be to finish the work-in-progress in-game credits display. Once that's done and we've sorted out which bits of content come from where, an list of third-party content and its authors can be shipped along with the game and viewed via the main menu. That ought to satisfy the Creative Commons attribution requirements handily. Licensing is invariably a pain. Chances are that for every project that gets it right, there are several that get it wrong. A degree of good faith must be assumed, especially between freely-licensed projects, or the entire ecosystem would collapse in a huge fireball of litigation.