Art Campbell wrote: > You can delete lines and words with Acrobat and keep it in PDF format.
Unfortunately, this is frequently not the case for drawings that originate in a CAD application. In nearly all cases, text is not comprised of font glyphs, but is actually drawn with lots of tiny curves. Similarly, what we percieve as a line or some other geometric primitive is often built up from dozens (or hundreds) of smaller line and curve segments. And to make matters worse, most CAD tools create arbitrary object groups that contain hundreds (even thousands) of tiny curves, not all of which are components of logically related drawing objects. I've had to deal with PDFs from CAD tools at four different companies, and there have always been issues. In trying to select all of the lines that make up the letters in some text, it often happens that you also select (and potentially delete) parts of objects that you need to keep. And even opening it in Illustrator is only a partial solution becase some of the grouped objects are so complex that Illustrator chokes when trying to ungroup them. But Acrobat does provide the opportunity to hide objects by drawing white shaped over them and then outputting a new "refried" PDF. I know there can be some techincal issues with this approach, but it has saved my bacon more than a few times. Fred Ridder
