Is posible extract Text from this PDF

Hello,

I'm trying extract text from the next PDF document
Tiff6.pdf -> click from download http://www.megaupload.com/?d=4WP3ZVO0

the GetPageText method always return empty strings,

The security flag value for ( 5 = Content Copying or Extraction ) is  (6 = Allowed)

Is posible extract the text?
If i open the document with acrobat reader i can saved the text from the document.

I'm using the 8.12 DLL version with Vb.NET

thanks in advance
best regards

The text extraction is working pretty well on this PDF with 8.13 beta 2.  I am getting the correct string results from this PDF.  

Hello Again,
Andrew, Ingo thanks for your help

I'm using the 8.12 version Andrew.

This is a sample of the code that i'm using.

    Private Function pGetPDFContent(ByVal documento As MemoryStream, Optional ByVal Password As String = "") As String
        documento.Seek(0, SeekOrigin.Begin)
        Dim docid As Integer = Qp.LoadFromString(documento.GetBuffer, Password)
        docid = Qp.SelectedDocument
        Return pGetPDFContent(docid)
    End Function

    Private Function pGetPDFContent(ByVal docId As Integer, Optional ByVal CloseDoc As Boolean = True) As String
        Qp.SelectDocument(docId)
        Dim salida As String = ""
        For i = 1 To Qp.PageCount
            Qp.SelectPage(i)
            Qp.RotatePage(-Qp.PageRotation)
            salida &= Qp.GetPageText(0)
        Next
        If CloseDoc Then
            Qp.RemoveDocument(docId)
        End If
        Return salida
    End Function

Yes, the document load correcly and the page count is 121 but the  GetPageText return "" with or without rotation

Thanks Andrew