A key?
Wasn’t there something during the keynote about this?
I guess they have to have some kind of pairing (like Bluetooth) to be able limit the number of streaming sources to 5 (or whatever it is)?
Or is it that finally this additional HTTP header thing is no longer optional for the server? That slighty modified MD5 hash of the request URL that the official clients & servers use? (I think I saw that implemented in daapd, but not mt-daapd?)