try this, found on the AUGI website
Edit>Copy the objects you wish to use and then Edit>Paste them in an empty drawing.
Then save the drawing as "AutoCAD R12/LT12 DXF" and close the file.
As the file closes, it will prompt you to save as 2000 version, but do not.
Now you can Copy and Paste from the file you just created which does not have the plot stamp attached since it was not an option back in the R12 days