12 C.F.R. § 221.113
(b) Briefly, the facts are as follows. Fund X, an open-end investment company, entered into a loan agreement with Bank Y, which was (and still is) custodian of the securities which comprise the portfolio of Fund X. The agreement includes the following terms, which are material to the question before the Board:
(f) A wide variety of arrangements as to collateral can be made between bank and borrower which will serve, to some extent, to protect the interest of the bank in seeing that the loan is repaid, without giving the bank a conventional direct “security” interest in the collateral. Among such arrangements which have come to the Board's attention are the following: