> Only the current audio/video frame is being sent to the viewers, there is no way they can download/cache the videos either for future usage.

This seems misleading, though. I think I get what was meant: clients can't send a request to download from the start or a specific offset and thus "download" the original file, the server is in charge of what's being sent. However, clients can still capture the frames, save them, and replay them, obviously. And I see a button to "Seek", so...