I believe that one of the most often used reasons to close the doors and/or label the court decision secret is to protect the victim of the crime. This means that if JA is found guilty, the rest of the world might never get to examine the evidence, since it has been withheld to protect the interests of the victims.
Yes, I live in Sweden, but no, I am not a lawyer.
As far as I know, you cannot be fined unless you do something illegal. In other words, there _must_ be at least one law you have broken with your actions or lack of actions. The obvious question then: _is_ there a law in Germany demanding that you secure your WiFi? Or is some law being extended to cover this situation?
In my country laws are usually interpreted very strictly: if they mention (just for example) print media, the law is not usually assumed to include digital media as well. This is normally a good thing: actions/things that are not explicitly illegal are automatically legal.
I am assuming the artist in question does not have their information protected. And getting such protection is possible only if there is a clear threat to a persons life: simply being famous is not enough for the authorities to deny the public access to your basic information. Some of my country's most famous artists have their information (full name, street address, birth date, and partner) accessible by anyone with the will to know it and an internet connection.
I've noticed several design suggestions in your code.