4.15 in the event Party B enforces this Agreement, at Party A’s expense, Party A will do all such acts and things and sign, endorse and/or execute such assignment, charges, authorities, powers of attorney, receipts and/or any other documents as Party B may from time to time reasonably require for perfecting or protecting Party B's rights and title to the Pledged Equity Interests, or for registering or enabling Party B to register the same in the name of the Party B or any purchaser, or for or to facilitate Party B's effective exercise or purported exercise of any of its rights under this Agreement.; and