Here are some of my favourite posts [Quick Start] when dealing with Educational users of Autodesk software.
1. In AutoCAD, *.dwg files that were created by an EDU version of the software will always have a Plot Stamp embedded in the file and there is no way to get rid of it. Please check out this post for further details:
EPILOGUE [June 20, 2014] Plot Stamp Removal is here:
2. If you had installed an Educational version of the software and you at some point install the Commercial version, you will need to perform some additional steps when installing it on the same computer:
3. Here is another post from the Without a Net blog site to quickly test if a *.dwg file has an Educational Plot Stamp in it:
4. AutoCAD 2014 SP1 and EDU warning suppression