Random person music library in iTunes
It just means someone on the same local network as you is sharing their own library.

As it has a padlock, it means a password would be needed to listen to it.



If it wasn't password protected, you'd see a note symbol instead.



The chances of seeing 'stray' shared libraries are of course greater if you're on public wifi - you need only worry if you were connected to a supposedly private network &amp; you don't recognise the name.