 What document requires a Material Debt Instrument to be pledged?
Subject to the final paragraph of this Section  4.01 , the Administrative Agent (or its counsel) shall have received (i) the certificate representing any Capital Stock required to be pledged pursuant to the Security Agreement, together with an undated stock power or similar instrument of transfer for each such certificate endorsed in blank by a duly authorized officer of the pledgor thereof, and (ii) any Material Debt Instrument required to be pledged pursuant to the Security Agreement endorsed (without recourse) in blank (or accompanied by an transfer form endorsed in blank) by the pledgor thereof.
the Security Agreement