Like the title says, in the game that I'm playing (right now, actually, I just alt-tabbed out of it) I just culturally conquered a planet that had a re-education center on it. Now, I'm going for a culture victory, so my culture is pretty much kicking ass and taking names, but still - the text on the re-education center says right on it "prevents this planet from being taken culturally " and it's a super project, so just one per empire, so you'd hope it does what it says it does (and hope it does it well!)