I have project use DocumentUltimate on .Net MVC.When click file to view. It's show file content and watermark "Document Ultimate". But its not show watermark when i run at localhost.

I don't want display watermark, please help me hide it.
I have active Lic.

My code:

var documentViewer = new DocumentViewer
            {
                Width = 800,
                Height = 1500,
                Id = "DocumentViewId",
                ToolbarVisible = true,
                SidePaneVisible = false,
                FitMode = FitMode.FitWidth,
                DisplayMode = DisplayMode.Window,
                Resizable = false,
                SidePaneTabsAtBottom = true,
                LayoutMode = LayoutMode.Continuous,
                Document = "~/files/" + _filename
            };

            return View(documentViewer);

Please, help me. Thanks