''' <summary>
''' Obfuscates encoding of all fonts of PDF document.
''' </summary>
''' <param name="pdfFilename">The filename of PDF document.</param>
''' <param name="resultFilename">The filename of resulting PDF document.</param>
Public Shared Sub ObfuscateEncodingOfAllFonts(pdfFilename As String, resultFilename As String)
    Using document As New Vintasoft.Imaging.Pdf.PdfDocument(pdfFilename)
        ' create obfuscator
        Dim textEncodingObfuscator As New Vintasoft.Imaging.Pdf.PdfTextEncodingObfuscator()
        Try
            ' obfuscate all fonts
            textEncodingObfuscator.Obfuscate(document)
            ' pack and save document to new location
            document.Pack(resultFilename)
        Catch ex As System.Exception
            System.Console.WriteLine(ex.Message)
        End Try
    End Using
End Sub

/// <summary>
/// Obfuscates encoding of all fonts of PDF document.
/// </summary>
/// <param name="pdfFilename">The filename of PDF document.</param>
/// <param name="resultFilename">The filename of resulting PDF document.</param>
public static void ObfuscateEncodingOfAllFonts(string pdfFilename, string resultFilename)
{
    using (Vintasoft.Imaging.Pdf.PdfDocument document = new Vintasoft.Imaging.Pdf.PdfDocument(pdfFilename))
    {
        // create obfuscator
        Vintasoft.Imaging.Pdf.PdfTextEncodingObfuscator textEncodingObfuscator = 
            new Vintasoft.Imaging.Pdf.PdfTextEncodingObfuscator();
        try
        {
            // obfuscate all fonts
            textEncodingObfuscator.Obfuscate(document);
            // pack and save document to new location
            document.Pack(resultFilename);
        }
        catch (System.Exception ex)
        {
            System.Console.WriteLine(ex.Message);
        }
    }
}