Apple TV stores a number of passwords (or some kind of credentials) needed to access services like Vimeo and YouTube, as well as the Apple IDs needed to access the iTunes Store (and the now defunct photo galleries).
Where are these passwords stored and how secure are they? Are they stored in a keychain like the ones used by OS X and iOS? If so, what are the "settings" for the keychain (expressed in terms of the corresponding settings on OS X)? Can anyone with access to the Apple TV hardware see the passwords it stores?