Exhibit 4.3 SENIOR DEBT REGISTRATION RIGHTS AGREEMENT AGREEMENT by and among Summus, Inc. (USA), a Florida corporation (the "Company"), and the holder of the Company's Senior Convertible Debt and Common Stock, whose name is set forth on the signature...Senior Debt Registration Rights Agreement • May 10th, 2004 • Summus Inc Usa • Services-business services, nec • North Carolina
