definiens: means any challenge to the [ * * * ], or [ * * * ] of any of the Licensed Patent Rights, includingwithout limitation : ( a ) filing a declaratory judgment action in which any of the Licensed Patent Rights is alleged tobe invalid or unenforceable ; ( b ) citing prior art pursuant to 35 U.S.C. § 122 or § 301, filing a request for re - examination of any of the Licensed Patent Rights pursuant to 35 U.S.C. § 302 or § 311, filing [ * * * ] of the LicensedPatent Rights pursuant to [ * * * ], or filing [ * * * ] of the Licensed Patent Rights pursuant to [ * * * ] ; or ( c ) filing orcommencing any re - examination, opposition, cancellation, nullity or similar proceeding against any of theLicensed Patent Rights in any country