The European Unitary Patent Convention is due to come into effect in 2023. The default position is that any European Patent granted after 1 March 2007 will fall under the jurisdiction of the new Unified Patent Court unless opted out. The Unified Patent Court (UPC) will offer a centralised court system not just for the upcoming Unitary Patents but also for “classical” European Patents.  This means a significant change to the regime under which a vast number of existing rights currently operate. One of the key decisions Patent Proprietors will have to make in the coming months is whether to opt out their existing Patents (and Applications) from the jurisdiction of the UPC. An opt out can be filed from the start of the “sunrise period” which is scheduled to begin early 2023.