The Dropbox Storage Plugin is for publishers who want to deploy pay per view videos that are stored in their own DropBox account; it allows MMCart publishers to stream directly from Dropbox and display the video into your own media player.  There is, in effect, double authentication and significantly more security. To our knowledge, this is the only software product that permits DropBox users to stream files in the JW Player, or other player configured. 

See the below video to see it in action.