How can I make Serviio Private?

I'm not talking about a password for Serviio on the internet.. Which is all I can seem to find.
I want to make it private on my Home network so only the people with the password can connect to my PC via Serviio and watch my Videos. I'm guessing this is impossible due to there not being much on this when I google it but I figured it couldn't hurt to ask.
One of my main concerns is having several people (room mates and their friends) all streaming full HD content to their TV's/Phones while I'm using my PC I'm only guessing but I presume that can't be good for my ping/connection speed and of course steaming content to my own TV. So will having a few people all watching different shows/films from my PC effect my computers DL/UL speeds and ping times or is that nothing to worry about.. I also don't really like the fact that people I don't know very well can browse through my personal photo's and videos but there's nothing too private in my Serviio Library so I'm not as worried about this.
Really appreciate any help!
I want to make it private on my Home network so only the people with the password can connect to my PC via Serviio and watch my Videos. I'm guessing this is impossible due to there not being much on this when I google it but I figured it couldn't hurt to ask.
One of my main concerns is having several people (room mates and their friends) all streaming full HD content to their TV's/Phones while I'm using my PC I'm only guessing but I presume that can't be good for my ping/connection speed and of course steaming content to my own TV. So will having a few people all watching different shows/films from my PC effect my computers DL/UL speeds and ping times or is that nothing to worry about.. I also don't really like the fact that people I don't know very well can browse through my personal photo's and videos but there's nothing too private in my Serviio Library so I'm not as worried about this.
Really appreciate any help!