I have seen people get around it by making their own version of the map. Those maps usually end up having the stations match their respective locations to each

I have seen people get around it by making their own version of the map. Those maps usually end up having the stations match their respective locations to each other more closely. They naturally don't look as 'good' as the official map though. But where does the copyright infringement start? Could you technically get around it if you changed a couple of the colours and fonts around and used slightly different angles?