I assumed that you have discovered that one of your hubs were copied by accident or by doing a search of "That exact Article Topic". Similarly, hubpages find out if there is another article out there that is exactly the same"Word for Word"or contain a large portion of the content of your article. Since they don't know who is the original producer of that article, they will label your article "Duplicate."Now it's now your duty to ensure that the "the article pirate" removes your article. If it has been removed, hubpages will know.