human: What are the main pros and cons of opt-out, i.e., of not using the UPC?
assistant: Opting out	Using the UPC
Patentee: Removes economically important patents from the UPC	Patentee: Test the UPC with less important patents
Patentee: Prevents revocation of a European patent in one single action in currently 17 CMS even after expiry of EPO opposition period	Patentee: Enforcement of a European patent in one single action in currently
17 CMS
Patentee: Lower litigation cost if litigation only planned in one or two EU Member states	Patentee: Lower litigation cost versus separate litigation in three or more EU
Member states
Patentee: Delays revocation of a European patent	Patentee: Speeds up enforcement of strong patents
Patentee/Infringer: Known and predictable case law of National Courts	Patentee: Higher values of the case and higher recoverable costs