What is the sunrise period for opting out and how long is it?

Opting-out means (temporarily, if so desired) removing the national validations of a traditionally granted European patent from the jurisdiction of the UPC, so that the national courts in the validation states have sole jurisdiction over the national validations. Shared jurisdiction between the UPC and national courts will only be possible once the UPC agreement comes into force. This consequently presents a change in jurisdiction for patentees with an existing granted patent portfolio. To prevent a situation in which patents in such an existing patent portfolio are involved in legal action at the UPC and against the wishes of the patent proprietor patent proprietors are given the opportunity to opt exiting patents out before the UPC agreement comes into force. The time window made available for this is referred to as the sunrise period and starts three months before the UPC agreement comes into force. 

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