Solution steps:
1. Save the setup drawing as and change the file type to "AutoCAD2004/LT200dxf (. Dxf) "In the Save As interface, and then click Save;
2. Reopening the newly saved dxf file with CAD, we found that the watermark has disappeared;
3. Then click Save As again to change the file type to AutoCAD2000/LT2000 drawing (. Dwg), and then click Save.
When win7 system inserts material CAD drawings, the watermark of "Education Edition" will appear. This paper introduces the method of removing watermark. Print the saved DWG file, and the modified drawing will not have the "Education Edition" watermark.