"Is BitTorrent Sync open-source?
BitTorrent Sync isn't open source software, and no announcements have been made to indicate that this will likely change."[1]
[1]http://forum.bittorrent.com/topic/17782-bittorrent-sync-faq-...
[1]http://forum.bittorrent.com/topic/17782-bittorrent-sync-faq-...
It would be awesome if they did open source it, or at least allow for third party (EFF?) review of source.