Subject to [Article 2.6], Forty Seven shall, and Forty Seven shall procure that its Affiliates and (sub)licensees shall not, directly or indirectly, initiate, engage in, file, finance, participate in, aid or otherwise assist in any re-examination, opposition, or other action or proceeding in any patent office, or court anywhere in the world whereby the ownership, validity, patentability, entitlement to, priority and/or enforceability of all or any of the Licensed Patent Rights is challenged or otherwise disputed.

at any time with immediate effect in the event Forty Seven, its Affiliates and/or (sub)licensees and/or any other person or entity under its direction and control, in violation of [Article 2.5], directly or indirectly, initiate, engage in, file, finance, participate in, aid or otherwise assist in any re-examination, opposition, or other action or proceeding in any patent office, court or other forum anywhere in the world whereby the ownership, validity, patentability, entitlement to, priority and/or enforceability of all or any of the Licensed Patent Rights is challenged or otherwise disputed;