Is it permissible to take out an interest-bearing loan to pay a ransom for the release of a prisoner?

Usury is not permissible except in cases of extreme necessity that threaten life, limb, honor, intellect, or property. Unjust imprisonment is considered one of these necessities that permit borrowing with interest, provided that there is no other means of liberation from incarceration, and that the borrowing is limited to the amount necessary to secure release from prison. However, if the imprisonment is rightful, then borrowing with interest is not permissible for him.