Private Sub convertToPdfButton_Click(ByVal sender As Object, ByVal e As EventArgs) Handles convertToPdfButton.Click
    ' Create a PDF document
    Dim pdfDocument As New Document()

    ' Set license key received after purchase to use the converter in licensed mode
    ' Leave it not set to use the converter in demo mode
    pdfDocument.LicenseKey = "fvDh8eDx4fHg4P/h8eLg/+Dj/+jo6Og="

    ' Add a page to PDF document
    Dim pdfPage As PdfPage = pdfDocument.AddPage()

    ' Set the encryption algorithm and the encryption key size if they are not the default ones
    If (Not bit128RadioButton.Checked Or Not rc4RadioButton.Checked) Then
        ' set the encryption algorithm
        If (rc4RadioButton.Checked) Then
            pdfDocument.Security.EncryptionAlgorithm = EncryptionAlgorithm.RC4
        Else
            pdfDocument.Security.EncryptionAlgorithm = EncryptionAlgorithm.AES
        End If

        ' set the encryption key size
        If (bit40RadioButton.Checked) Then
            pdfDocument.Security.KeySize = EncryptionKeySize.EncryptKey40Bit
        ElseIf (bit128RadioButton.Checked) Then
            pdfDocument.Security.KeySize = EncryptionKeySize.EncryptKey128Bit
        ElseIf (bit256RadioButton.Checked) Then
            pdfDocument.Security.KeySize = EncryptionKeySize.EncryptKey256Bit
        End If
    End If

    ' Set user and owner passwords
    If userPasswordTextBox.Text.Length > 0 Then
        pdfDocument.Security.UserPassword = userPasswordTextBox.Text
    End If

    If ownerPasswordTextBox.Text.Length > 0 Then
        pdfDocument.Security.OwnerPassword = ownerPasswordTextBox.Text
    End If

    ' Set PDF document permissions
    pdfDocument.Security.CanPrint = printEnabledCheckBox.Checked
    pdfDocument.Security.CanPrintHighResolution = highResolutionPrintEnabledCheckBox.Checked
    pdfDocument.Security.CanCopyContent = copyContentEnabledCheckBox.Checked
    pdfDocument.Security.CanCopyAccessibilityContent = copyAccessibilityContentEnabledCheckBox.Checked
    pdfDocument.Security.CanEditContent = editContentEnabledCheckBox.Checked
    pdfDocument.Security.CanEditAnnotations = editAnnotationsEnabledCheckBox.Checked
    pdfDocument.Security.CanFillFormFields = fillFormFieldsEnabledCheckBox.Checked

    If ((PermissionsChanged(pdfDocument) Or pdfDocument.Security.UserPassword.Length > 0) And
        pdfDocument.Security.OwnerPassword.Length = 0) Then
        ' A user password is set but the owner password is not set or the permissions are not the default ones
        ' Set a default owner password
        pdfDocument.Security.OwnerPassword = "owner"
    End If

    Cursor = Cursors.WaitCursor

    Dim outPdfFile As String = "DemoAppFiles\Output\PDF_Creator\Set_Permissions_Password.pdf"
    Try
        ' Create a HTML to PDF element to add to document
        Dim htmlToPdfElement As New HtmlToPdfElement(urlTextBox.Text)

        ' Optionally set a delay before conversion to allow asynchonous scripts to finish
        htmlToPdfElement.ConversionDelay = 2

        ' Add the HTML to PDF element to document
        pdfPage.AddElement(htmlToPdfElement)

        ' Save the PDF document in a memory buffer
        Dim outPdfBuffer() As Byte = pdfDocument.Save()

        ' Write the memory buffer in a PDF file
        System.IO.File.WriteAllBytes(outPdfFile, outPdfBuffer)
    Catch ex As Exception
        ' The PDF creation failed
        MessageBox.Show(String.Format("Create PDF Document Error. {0}", ex.Message))
        Return
    Finally
        ' Close the PDF document
        pdfDocument.Close()

        Cursor = Cursors.Arrow
    End Try

    ' Open the created PDF document in default PDF viewer
    Try
        Process.Start(outPdfFile)
    Catch ex As Exception
        MessageBox.Show(String.Format("Cannot open created PDF file '{0}'. {1}", outPdfFile, ex.Message))
    End Try
End Sub