What is Private Streaming and what do you use it for?
Private streaming works like an expiring URL on streaming videos and audios. Thus, a link to a streaming video remains only valid for a period of time. After that, the URL becomes obsolete and the video will not play. This technique prevents other sites from sharing your media while you pay for the bandwidth. It is mostly used for video on demand(VOD) or for paid video/audio tutorials and courses.
However, RTMP streaming is on its way out as Flash gets deprecated.
consider using HLS adative streaming instead.