The Borrower undertakes that the Finance Documents shall both at the date of execution and delivery thereof and so long as any moneys are owing under any of the Finance Documents be valid and binding obligations of the respective parties thereto and enforceable in accordance with their respective terms and that it will, at its expense, execute, sign, perfect do and (if required) register, and will procure the execution, signing, perfecting, doing and (if required) registering by each of the other Security Parties of, any and every such further assurance, document, act or thing as in the reasonable opinion of the Lender may be necessary or desirable for perfecting the security contemplated or constituted by the Finance Documents.