I mean, the minimum you need is some authentication mechanism, a secure certificate, an authenticated endpoint to send a live data feed to, an endpoint to query a given live data feed from, maybe a website to serve the whole thing for people that don't have their own tool for reading and playing back a live data feed...

...and the infrastructure to distribute that data feed from ingest to content delivery. Easy.

(Note: easy does not mean cheap. Even if a live data feed ingest and delivery was easy to implement (which I doubt it is), you'd skip buffering (to reduce memory demands) and only used a single server (to spare such stupid things as distributed networks, load balancing, redundancy or costs for scaling cloud solutions), you'd still have computational overhead of network operations and of course a massive data throughput.)