[PAULUS libro secundo sententiarum. ] §20.2.8.prCum debitor gratuita pecunia utatur, potest creditor de fructibus rei sibi pigneratae ad modum legitimum usuras retinere.
[PAULUS, in his second book of Opinions.] Even if the debtor uses the money interest-free, the creditor can retain interest from the fruits of the thing pledged to him up to the legal limit.