I think DPP is just a typo of DDP. According to my quick google searches, DPP in relation to logistics is "Damage Protection Plan (DPP) is an additional insurance of containers, provided by the container leasing companies to their clients. When the client pays a small daily contribution, the leasing company insures him against certain types of damage or against maintenance costs for the containers he leases.", so that more for when you are leasing a physical container.I think it is not that difficult to explain here
I know what DDP is and DAP, taxes not included but I don´t know what DPP is.