At all times during the Term of each Device Lease, Lessees and Servicer shall not directly or indirectly give or allow another Person to give any interest in or Lien over the Device subject to such Device Lease or over such Device Lease, other than Permitted Device Liens. Lessees shall promptly, at their own cost and expense, take such action as may be necessary to duly discharge or eliminate any such Liens (other than Permitted Device Liens) upon obtaining Knowledge thereof.