Контекст:
the relevant Underlying Customer owns, with full title guarantee, all investments, margin (or collateral)
deposited with, transferred to us or charged in our favour, by you acting as agent for your Underlying
Customer and such investments, margin (or collateral) are free from any prior mortgage, charge, lien or other encumbrance whatsoever and neither you acting as agent for the relevant Underlying Customer, nor the Underlying Customer itself, will further pledge or charge such investments, margin (or collateral) or grant any lien over them while it is pledged or charged to us except with our prior written consent; and

Что тут имеется в виду под charged in our favour