If either Party reasonably believes that any Presage Patent in the Territory is being infringed by a Third Party, or is subject to a declaratory judgment action arising from such infringement pursuant to which a Third Party claims that any Presage Patent is invalid or unenforceable, or a Third Party is engaged in an unauthorized use or misappropriation of any Presage Know-How that pertains to the Compound or a Product in the Territory (an “ Infringing Activity ”), the Party possessing such knowledge or belief shall promptly notify the other Party and provide it with details of such infringement or claim that are known by such Party. In addition, in the event that Presage believes that any Patent Right Controlled by MEI or any of its Affiliates that relates to the Compound and/or Product, including the composition, method of use and/or method of manufacture thereof, including any MEI Patent, if any, is being infringed by a Third Party or is subject to a declaratory judgment action arising from such infringement pursuant to which a Third Party claims that any MEI Patent is invalid or unenforceable, Presage shall promptly notify MEI and provide it with details of such infringement or claim.