Use built-in Raster to Vector software built into progeCAD Professional and move your paper based drafting to the computer bringing your legacy drawings along with you. Simply scan and convert. Raster Vector conversion, while not perfect, gives a great step forward in moving to the computer. Try progeCAD for 30 days free, no obligation at http://www.progecad.us and see how this DWG "AutoCAD Like" CAD software has almost no learning curve for anyone who uses AutoCAD.