The European Software Market Association (ESOMA) and others have asked the Belgian Constitutional Court to annul Belgium’s ratification of the Agreement on the Unified Patent court on the basis that it violates the Belgian Constitution, the European Convention on Human Rights and the Charter of Fundamental Rights of the European Union. The challenge is formed on the following claims: (i) that the language rule of the UPC will discriminate against Dutch-speaking Belgian citizens; (ii) that the Rules of Procedure of the UPC and any amendments can become law without being confirmed by the Belgian legislator; and (iii) that the European Patent Office (EPO) lacks judicial responsibility. There is currently no indication as to when this challenge will be resolved, though in principle a decision needs to be given within 12 months after filing of the case.