(a) A covered swap entity that posts any collateral other than for variation margin with respect to a non-cleared swap or a non-cleared security-based swap shall require that all funds or other property other than variation margin provided by the covered swap entity be held by one or more custodians that are not the covered swap entity or counterparty and not affiliates of the covered swap entity or the counterparty.

(b) A covered swap entity that collects initial margin required by § 624.3(a) with respect to a non-cleared swap or a non-cleared security-based swap shall require that such initial margin be held by one or more custodians that are not the covered swap entity or counterparty and not affiliates of the covered swap entity or the counterparty.

(c) For purposes of paragraphs (a) and (b) of this section, the custodian must act pursuant to a custody agreement that:

(1) Prohibits the custodian from rehypothecating, repledging, reusing, or otherwise transferring (through securities lending, securities borrowing, repurchase agreement, reverse repurchase agreement or other means) the collateral held by the custodian, except that cash collateral may be held in a general deposit account with the custodian if the funds in the account are used to purchase an asset described in § 624.6(a)(2) or (b), such asset is held in compliance with this § 624.7, and such purchase takes place within a time period reasonably necessary to consummate such purchase after the cash collateral is posted as initial margin; and

(2) Is a legal, valid, binding, and enforceable agreement under the laws of all relevant jurisdictions, including in the event of bankruptcy, insolvency, or a similar proceeding.

(d) Notwithstanding paragraph (c)(1) of this section, a custody agreement may permit the posting party to substitute or direct any reinvestment of posted collateral held by the custodian, provided that, with respect to collateral collected by a covered swap entity pursuant to § 624.3(a) or posted by a covered swap entity pursuant to § 624.3(b), the agreement requires the posting party to:

(1) Substitute only funds or other property that would qualify as eligible collateral under § 624.6, and for which the amount net of applicable discounts described in appendix B of this part would be sufficient to meet the requirements of § 624.3; and

(2) Direct reinvestment of funds only in assets that would qualify as eligible collateral under § 624.6, and for which the amount net of applicable discounts described in appendix B of this part would be sufficient to meet the requirements of § 624.3.