You can appeal against decisions of the German Patent and Trademark Office (DPMA) in property rights proceedings.
Press law is a sub-area of media law which, based on the freedom of the press in Art. 5 sec. 1 sentence 2 GG, deals with the legal framework conditions of the press....
If you have indications of possible violations of antitrust law, you can submit them as an input or complaint to the Federal Cartel Office.