Private Sub convertToPdfButton_Click(ByVal sender As Object, ByVal e As EventArgs) Handles convertToPdfButton.Click
    ' Create a HTML to PDF converter object with default settings
    Dim htmlToPdfConverter As New HtmlToPdfConverter()

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

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

    If ownerPasswordTextBox.Text.Length > 0 Then
        htmlToPdfConverter.PdfSecurityOptions.OwnerPassword = ownerPasswordTextBox.Text
    End If

    If htmlToPdfConverter.PdfSecurityOptions.UserPassword IsNot Nothing AndAlso htmlToPdfConverter.PdfSecurityOptions.UserPassword.Length > 0 AndAlso (htmlToPdfConverter.PdfSecurityOptions.OwnerPassword Is Nothing OrElse htmlToPdfConverter.PdfSecurityOptions.OwnerPassword.Length = 0 OrElse htmlToPdfConverter.PdfSecurityOptions.UserPassword = htmlToPdfConverter.PdfSecurityOptions.OwnerPassword) Then
        ' A user password is set but the owner password is not set or is identical to user password
        ' Set a different owner password
        htmlToPdfConverter.PdfSecurityOptions.OwnerPassword = htmlToPdfConverter.PdfSecurityOptions.UserPassword & "_owner"
    End If

    ' Set PDF document permissions
    htmlToPdfConverter.PdfSecurityOptions.CanPrint = printEnabledCheckBox.Checked
    htmlToPdfConverter.PdfSecurityOptions.CanCopyContent = copyContentEnabledCheckBox.Checked
    htmlToPdfConverter.PdfSecurityOptions.CanEditContent = editContentEnabledCheckBox.Checked
    htmlToPdfConverter.PdfSecurityOptions.CanEditAnnotations = editAnnotationsEnabledCheckBox.Checked
    htmlToPdfConverter.PdfSecurityOptions.CanFillFormFields = fillFormFieldsEnabledCheckBox.Checked

    Cursor = Cursors.WaitCursor

    ' Convert HTML to PDF using the settings above
    Dim outPdfFile As String = "DemoAppFiles\Output\HTML_to_PDF\Set_Permissions_Password.pdf"
    Try
        ' Convert the HTML page to a PDF document in a memory buffer
        Dim outPdfBuffer() As Byte = htmlToPdfConverter.ConvertUrl(urlTextBox.Text)

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