Allows you convert PDF to DWG. Support PDF line, rectangle, ellipse, round rectangle, line segments, bezier segments, image and text etc.
Why some PDF files can just convert to images?
If some one use software convert DWG to PDF and the internal process is DWG to Image(JPG or GIF), then convert the Image to PDF. Then these PDF files can’t convert back to DWG beacause it’s raster image now. But if the DWG is converted direct to PDF and no Image as the intermediate result then these PDF can convert back to DWG.