I really don’t understand.
I created signed url by using token authentication from this tutorial
https://www.wowza.com/docs/how-to-protect-a-wowza-cdn-stream-target-with-token-authorization-in-wowza-streaming-cloud
But guess what my viewer still can copy m3u8 and share to anyone and paste it in open network menu in VLC and can watch it super smoothly without any protection.
Wowza Cloud should have feature that can protect playlist with domain referrer just like engine.