Unified Patent Court
A single patent court for Member States of the European Union
Yes, a protective letter may be filed, typically where a person considers that there is a risk that an application for provisional measures against him as a defendant may be lodged before the UPC (Rule 207 of the Rules of Procedure of the UPC). A protective letter, in essence, is a pre-emptive statement of defence.
A protective letter may be filed at any time. It may contain facts, evidence and arguments of law and set out the reasons why any future application for provisional measures should be rejected by the UPC. The protective letter has effect for a period of 6 months (extendable upon payment of an extension fee). It is not made public. A fee has to be paid.