Linux is build with different users in mind. So it is not a problem to forbid a user to run any program the root don't like, or run only programs the root like.
I guess the idea is that your parents store the date and you don't get root access (or you store the date for your kids and don't give them root access).
Only that the explanation is wrong.
For first a child can not judged for anything in Germany. If it would be a older than than 14 then it could be judged but only by a special court with special rules and laws. The chance that both sentences would be presented on the same day would be low.
The real answer is that they were 5 persons (4 men and 1 woman). 4 of them (including the woman) were considered as leaders (getting higher sentences), while another was only considered as a non-leader (getting a lower sentence).
Thanks 🙂