.NET PDF library - Redact PDF Documents

using Syncfusion.Pdf.Parsing;
using Syncfusion.Pdf.Redaction;
using Syncfusion.Pdf;
using Syncfusion.Drawing;

using (FileStream docStream = new FileStream(@"Input.pdf", FileMode.Open, FileAccess.Read))
{
    //Load the PDF document from the input stream
    using (PdfLoadedDocument loadedDocument = new PdfLoadedDocument(docStream))
    {
        // Get the first page of the loaded document
        PdfLoadedPage firstPage = loadedDocument.Pages[0] as PdfLoadedPage;
        // Create a PDF redaction for the specified rectangle on the page
        RectangleF redactionRectangle = new RectangleF(340, 120, 140, 20);
        PdfRedaction redaction = new PdfRedaction(redactionRectangle);
        // Add the redaction to the first page
        firstPage.AddRedaction(redaction);
        // Redact the contents from the PDF document
        loadedDocument.Redact();
        // Save the redacted PDF document to a file stream
        using (FileStream outputFileStream = new FileStream("Redact.pdf", FileMode.Create, FileAccess.ReadWrite))
        {
            loadedDocument.Save(outputFileStream);
        }
    }
}