Removing Watermark from pdf

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C#

itextsharp

I added a watermark on PDF using Pdfstamper. Here is the code:

for (int pageIndex = 1; pageIndex <= pageCount; pageIndex++)
{
 iTextSharp.text.Rectangle pageRectangle = reader.GetPageSizeWithRotation(pageIndex);
 PdfContentByte pdfData = stamper.GetUnderContent(pageIndex);
 pdfData.SetFontAndSize(BaseFont.CreateFont(BaseFont.HELVETICA  BaseFont.CP1252  
 BaseFont.NOT_EMBEDDED)  watermarkFontSize);
 PdfGState graphicsState = new PdfGState();
 graphicsState.FillOpacity = watermarkFontOpacity;
 pdfData.SetGState(graphicsState);
 pdfData.SetColorFill(iTextSharp.text.BaseColor.BLACK);
 pdfData.BeginText();
 pdfData.ShowTextAligned(PdfContentByte.ALIGN_CENTER  "LipikaChatterjee"  
 pageRectangle.Width / 2  pageRectangle.Height / 2  watermarkRotation);
 pdfData.EndText();
}

This works fine.
Now I want to remove this watermark from my PDF. I looked into iTextSharp but was not able to get any help. I even tried to add watermark as layer and then delete the layer but was not able to delete the content of layer from the PDF.
I looked into iText for layer removal and found a class OCGRemover but I was not able to get an equivalent class in iTextsharp.