Final answer:
Proprietary information about a shipment can be shared with a carrier when necessary for service provision, under appropriate confidentiality protections, and following company policies and regulations.
Step-by-step explanation:
It is generally acceptable to share proprietary information about a shipment with a carrier when there is a clear necessity for the carrier to know the information in order to complete their service effectively, and when there are appropriate confidentiality agreements or privacy protections in place. Such occasions may include providing details necessary for customs clearance, ensuring special handling requirements due to the nature of the goods, or coordinating delivery schedules. It is always vital to ensure that the disclosure of proprietary information is conducted in accordance with the company's policies, regulatory requirements, and contractual obligations to safeguard the interests of the company and its clients.