Often times in the world of CAD and engineering we find ourselves with a PDF document that we wish we could modify but can't. The solution used to be we had to recreate the document in its native program from scratch. This was especially painful if we were dealing with a complicated AutoCAD drawing in PDF format. Luckily, those days are long gone. Investintech has created the best PDF conversion software around and one of the best benefits is being able to convert those pesky PDFs back into DWG or DXF files. Not only does it convert PDF to AutoCAD, it also does the whole range of Office products including Excel, Word, PPT, and others. How awesome is that? It's easy to use and there are Windows, Mac, and Linux versions available.
I highly recommend you check it out!