The blackmail done by a "private rogue lawyers", has a judge signature to authorize the ISP to give my personal information based on the IP that they supposedly got doing the infringement. This is always done in courts in Bavaria that are very copyright-owners friendly.
Furthermore, around 1 year after I "Lawyered up", I still got a official Court order to show up in court, that's when I decided to fold and pay the 1000€.