greenscreen
                                
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                        Add role based authentication
Protect chromecast administration with an authentication system, so not everyone can go poking around and making changes.
Protect greenscreen.io or the Chromecast itself?
You can easily firewall the application off, install apache or nginx on the server, then proxy to greenscreen.io with whatever security you want.
Since the Chromecasts themselves need to be on a secure wireless network to prevent people from manipulating them directly- there doesn't seem to be any advantage to protecting the greenscreen application itself since it has to be on the secure network also.
The idea here was to add roles and authentication to the Greenscreen web interface that would prevent everyone from, say, using the "channel takeover" feature. That might be something that an org would like to reserve for "admin" users, but still let anyone set up their own Chromecast and channels.
That makes a whole lot more sense- thanks for clarifying.