Our guy on site ask me how to remove “Produced by an Autodesk Educational Product” on his drawing. The Autodesk stamp is seen on all sides of the drawing which is normally appear when you are using Autodesk Educational Product.
The thing is he is not using the educational release, he is using a licensed one so this plot stamp should not be present in his drawing. Quick research shows that the stamp is some kind of Autodesk bug (not sure about this but this is what I read from autocad forum & discussion).