Without limiting clause 15.6, the Project Owner will not pay for any Materials off-Site unless:
(a) the Project Owner is satisfied that the unencumbered title to those Materials will pass to the Project Owner on payment and the Project Owner is satisfied that the Materials are protected and insured to the Project Owner's satisfaction; or
(b) the Materials are delivered to a Site and the terms of the supply of the Materials are that unencumbered title to those Materials passes to the Project Owner or the NOPs on delivery.