The branding parameters are in interface_config.js. The default file is in /usr/share/jitsi-meet. You can replicated the nginx configuration for the interface_config just like the config.js if you want to keep your changes between upgrades.
As for the authentication setup, look at the "Secure Domain" section at the bottom of this: https://github.com/jitsi/jicofo/blob/master/README.md.
Hope that helps,
jicofo - JItsi COnference FOcus is a server side focus component used in Jitsi Meet conferences.
From: users <firstname.lastname@example.org> on behalf of Elijah Michael <email@example.com>
Sent: Saturday, July 30, 2016 9:03 AM
Subject: [jitsi-users] How to remove logo, name of window, and protect welcome screen with a password.
I was told that I can remove the Jitis logo in the config.js file. However, I am having a hard time finding that setting. The file I am looking at is "/etc/jitsi/meet/(My URL)-config.js Is that the correct file?
I would also like to change the name of the window and / or tab with the name of my company.
Last but not least, I would like to password protect the welcome screen so that not just anybody can create a meeting room. I would like to be the only one able to create a meeting room.