4. Language to be used 

In principle, the language to be used is the language of the proceedings relating to the European patent, but another official language of the EPO may be used at the court's request. At least the request for an opinion itself, any submissions from the parties and any amendments to the patent must be in that language or translated into that language. The opinion is also produced in that language. However, where appropriate, the examining division will take the provisions of Art. 70(2) to Art. 70(4) into account.

The provisions of Rule 3(3) apply to documents to be used as evidence (see A‑VII, 3).

The court or the parties are responsible for providing any translations required to satisfy the above conditions.