plotting in ADT3 prints a message "PRODUCED BY AN AUTODESK EDUCATIONAL PRODUCT"

I have received some drawings from a supplier and when i print them, the message : "PRODUCED BY AN AUTODESK EDUCATIONAL PRODUCT" is printed on the four sides of the sheet. I tried to wblock and insert into another drawing, but I get the same result. How do I get rid of it?

 

Information from saved messages about the education stamp:

The plot stamp is supposed to be there if you are using the
educational version of AutoCAD, or are using a file that at some
point went through an educational version of AutoCAD. Somewhere,
somehow your drawing or a component being used went through such
an educational version, hence the stamp. It is deliberately built
into the educational program to stop it from being used in an
office environment.

Search the newsgroups for past discussions of the stamp. Go to
the search engine at
http://discussion.autodesk.com/index2.jspa?categoryID=8, put in
the key words educational stamp and hit enter.

Here's the main reference page for student and educational
institution products:
http://usa.autodesk.com/adsk/servlet/index?siteID=123112&id=3268472

Also see For Educational Use Only plot stamp
http://support.autodesk.com/getDoc.asp?id=TS63668

AutoCAD 2004 does have a warning capability built in. Older
versions require Autodesk Reseller intervention.

AutoDesk Knowledge Base item:
http://support.autodesk.com/getdoc.asp?id=TS63668

Issue

When you plot a drawing that was created in or that contains
drawing data
that was created in the Educational (Student and Faculty) version
of
AutoCAD® or AutoCAD-based software, the following plot stamp or
watermark
appears in the plot:

For Educational Use Only

Solution

There is no way to circumvent the plot stamp. This is as designed
to
discourage the commercial use of an educational version of an
AutoCAD
product. Autodesk sells educational versions of software on the
premise that
the software will be used for educational purposes only.

This can also occur when using blocks or other components of
drawings that
have been created or modified in an Educational version. This
includes
layers, blocks, layouts, and so on.

ALSO if you have a commercial drawing that has an educational
stamp:

We cannot assist you in this forum. This is a PEER TO PEER
support group.
Help with this issue is only available through your Authorized
AutoDesk
Reseller and the Autodesk Product Support group.

Contact your reseller and request a copy of EMR_STAMP.LSP (or
EMR_Utility).
This is a lisp utility to search out infected files. If you have
a few
infected files they can be emailed to AutoDesk for cleaning. If
you have a
large quantity to be cleaned they have a 15 day program (involves
an
approval process) that you can use to clean the files.

If needed please copy this information and email it to your
reseller as this
problem may be something your representative may not be familiar
with.

Please note that AutoCAD 2004 and AutoCAD 2005 include automatic
detection and warning of
the presence of Educational Drawing Files.