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In all sempervideo videos the password is 123456. I think it's a running gag for a tech-channel.

I know. And additionally for those demo purposes, it's surely a good choice. But there may be users, watching this video, who don't know this. :D

I totally agree. :)

The Pis ssh port should only be accessible from the LAN - unless the router setup has been changed to allow shh to pass from outside the Network. If not for any offenders inside your network "123456" should be fine nonetheless ;)