Yea, you violated a law that is not enforced. Like how you are violating the law if you give some money to the neighbors kid to mow your lawn or if you cook some pie and you give it away to a friend without having proper certifications (at least in Sweden on paper you need to have certification to do that. Of course it is not enforced)

And no, Germany does not allow retroactive criminal punishments. That’s more something that happens in Russia, China and probably soon America