Today , I found a way to get rid of it
![Very Happy :D](./images/smilies/icon_biggrin.gif)
I edited /etc/ati/signature file replacing the "UNSIGNED" line with the following code:
9777c589791007f4aeef06c922ad54a2:ae59f5b9572136d99fdd36f0109d358fa643f2bd4a2644d9efbb4fe91a9f6590a145:f612f0b01f2565cd9bd834f8119b309bae11a1ed4a2661c49fdf3fad11986cc4f641f1ba1f2265909a8e34ff1699309bf211a7eb4d7662cd9f8e3faf14986d92f646f1bc
I saved the file and restarted X . No more Watermark
![Exclamation :!:](./images/smilies/icon_exclaim.gif)
It was on 'http://askubuntu.com/questions/124292/w ... vers-fglrx'