itional, variable fees and expenses related to the care services are invoiced on a monthly basis by the vendor and the operator pays within 30 days of the date of the vendor's invoice. In the event of any delay in payment there are penalty clauses, which apply in terms of interest charges on the amount, from the due day until the amount is credited to the vendor's bank account. Liabilities The care agreement limits the vendor's responsibilities to proper and timely provision of the agreed services, using due concern and a professional attitude. Both the vendor and the operator should not blame the other in case any liability arises from any injury or accident to any person or property of some third party, including those of its subcontractors involved in the care activities. The vendor is considered as the main supplier of equipment and services; hence it has to provide evidence of having insurance coverage of its own employees plus those of any third party that works on the vendor's behalf. The operator has its own liability to provide adequate security and prevent unauthorized access to the equipment sites and also to install proper warning signs outside such sites. The vendor and the operator are not to be held liable for the other's loss in profit, revenue, use or any collateral or eventful damage if it happens in connection with the care agreement. Auxiliary Provisions The vendor has the right to use subcontractors and third party suppliers for fulfilling its duties towards performing and providing the care services to the operator, while remaining fully responsible towards the operator for the vendor's obligations under this care agreement. All copyrights, patents, licences, design rights, trade secrets and similar proprietary rights will remain exclusively with the vendor and its licensors. The operator can neither claim on those proprietary rights and licenses, nor perform any illegal action that compromises the rights to the vendor's proprietary design and information. In case a third party is involved b