No party has the right to, directly or indirectly, in whole or in part, assign, delegate, convey or otherwise transfer, whether voluntarily, involuntarily or by operation of law, its rights and obligations under this agreement, except with the prior written approval of the other party or parties as applicable. Notwithstanding the foregoing, any party may assign, delegate, convey or otherwise transfer its own rights and obligations under this agreement without obtaining the prior written approval of any other party to a successor by merger, consolidation or similar business combination or to a purchaser in connection with the sale of all or substantially all of such party’s assets.  Any action prohibited by this Section 6.4 will be null and void.