Security cover requirement: secured debt must maintain full cover and trustees must deliver prescribed due diligence certificates. Secured debt securities must be secured by full security cover or higher as per the offer document and/or Debenture Trust Deed, sufficient at all times to discharge principal and interest. Charges and securities must be disclosed in the offer document and Debenture Trust Deed with an undertaking regarding encumbrances or prior consent of existing chargeholders. Debenture trustees must provide due diligence certificates in prescribed formats for secured and unsecured issues, confirming adequacy of offer-document disclosures, disclosure of covenants, and execution of the Debenture Trust Deed before filing the listing application. Credit rating press releases must be current within one year.