Unwanted Element in bottom left corner

[Yves]

In every document generated with TcPDF there is a element with no content in the bottom left corner.

The element is only visible when examined in software like Adobe Acrobat, but causes some problems for us because we need our pdfs to work with an external software (epost). This software complains about the element, because it is in a prohibited area.

Code:

<?php 
require('tcpdf.php');
class MyPdf extends TCPDF {
    public function Header() {

    }
    public function Footer() {

    }
}
$pdf = new MyPdf('P', 'mm', 'A4', true, 'UTF-8', false, false);
$pdf->setPrintHeader(false);
$pdf->setPrintFooter(false);
$pdf->SetFont('freesans');
$pdf->SetMargins(20, 7);
$pdf->setPageOrientation('P');
$pdf->SetAutoPageBreak(true,20);
$pdf->AddPage('P', '', true);
$pdf->write(10, 'test');
$pdf->Output(__DIR__.'/testneu.pdf', 'F');

PDF

I attached a screenshot from acrobat with the element marked.

Is there a way to get rid of this element?

[Simon]

This element is some invisible text that reads: Powered by TCPDF (www.tcpdf.org).
It is invisible and doesn't print.

[Yves]

This solved the problem.
Thank You :)