This Agreement constitutes the entire understanding of the parties with respect to the subject matter hereof, and supersedes all other discussions, promises, representations, warranties, agreements and understandings between the parties with respect thereto. This Agreement may not be modified, altered or amended except by an agreement in writing signed by a duly authorized representative of each Note Party and Holders holding a majority of principal amount of the outstanding 2021 Notes held by Holders that are parties hereto as of the date of any such modification, alteration or amendment to this Agreement.