string inputFilePath = "test1.doc";
            Telerik.Windows.Documents.Flow.Model.RadFlowDocument document;
            Telerik.Windows.Documents.Flow.FormatProviders.Doc.DocFormatProvider doc_provider = new Telerik.Windows.Documents.Flow.FormatProviders.Doc.DocFormatProvider();
            using (Stream input = File.OpenRead(inputFilePath))
            {
                document = doc_provider.Import(input, TimeSpan.FromSeconds(10));
            }

            Telerik.Windows.Documents.Flow.FormatProviders.Docx.DocxFormatProvider docx_provider = new Telerik.Windows.Documents.Flow.FormatProviders.Docx.DocxFormatProvider();
            string outputFilePath = "Exported.docx";
            using (Stream output = File.OpenWrite(outputFilePath))
            { 
                docx_provider.Export(document, output, TimeSpan.FromSeconds(10));
            }

            Process.Start(new ProcessStartInfo() { FileName = outputFilePath, UseShellExecute = true });

<w:sdt>
  <w:sdtPr>
    <w:text w:multiLine="1"/>
  </w:sdtPr>
  <w:sdtContent>
    <w:r>
      <w:t>Line 1</w:t>
    </w:r>
    <w:r>
      <w:br/>
    </w:r>
    <w:r>
      <w:t>Line 2</w:t>
    </w:r>
  </w:sdtContent>
</w:sdt>

<w:permStart w:id="1"/>
  <w:permStart w:id="2"/>
    ... content ...
  <w:permEnd w:id="2"/>
<w:permEnd w:id="1"/>

<w:permStart w:id="1"/>
  <w:permStart w:id="2"/>
<w:permEnd w:id="1"/>
  <w:permEnd w:id="2"/>

var startPermissionRanges = contentDocument.EnumerateChildrenOfType<PermissionRangeStart>().ToList();
var endPermissionRanges = contentDocument.EnumerateChildrenOfType<PermissionRangeEnd>().ToList();

foreach (PermissionRangeStart rangeStart in startPermissionRanges)
{
    rangeStart.Paragraph.Inlines.Remove(rangeStart);
}

foreach (PermissionRangeEnd rangeEnd in endPermissionRanges)
{
    rangeEnd.Paragraph.Inlines.Remove(rangeEnd);
}