Is compensating for a lost book with five identical copies of it, or with an amount determined by the library, considered usury?

The university library's condition that anyone who damages or loses a book must replace it with five copies is not considered usury (riba), because the relationship is a loan (i'ara) and not a debt (qard), and books are not among the usurious categories. However, this condition is invalid because it holds the borrower liable for more than the book's value. The library should limit its claim to obliging the person who damaged the book to replace it with one copy or its value, along with the value of any additional costs like stickers and cataloging. Sheikh Abd al-Rahman al-Barrak holds that this condition is impermissible and involves injustice and oppression.