Assignment or attempted assignment by any Seller Party or Guarantor of this Agreement or any rights hereunder without first obtaining the specific written consent of Buyer, or the granting by any Seller of any security interest, lien or other encumbrances on any Purchased Assets, Mortgage Loans or Contributed Assets, as applicable, to any person other than Buyer; or the granting by REO Subsidiary of any security interest, lien or other encumbrances on any Purchased Asset or Contributed Asset to any person other than Buyer or nominee approved by Buyer.