IVDP meaning in General ?

Port wine (also known as vinho do Porto, Portuguese pronunciation: [ˌviɲu duˈpoɾtu], or simply port) is a Portuguese fortified wine produced in the Douro Valley of northern Portugal. It is typically a sweet red wine, often served as a dessert wine, although it also comes in dry, semi-dry, and white varieties.

Other port-style fortified wines are produced outside Portugal, in Argentina, Australia, Canada, France, India, South Africa, Spain, and the United States, but under the European Union Protected Designation of Origin guidelines only wines from Portugal are allowed to be labelled "port".