It would be best to contact your VAR. Although it is possible to have the watermark removed i beleive you will need a good explanation as obviously student editions are just that so your customers should not be using it for commericial work.
One other possiblity is one of your customers is using a commercial version but perhaps left the templates from a previous student version (this causes it still to leave watermarks from experience)
once it is saved as a student\educational always a sutdent\educational, thought you can make a new SW drawing using your drawing templates with no watermak.
you'll have to copy and paste the views form the student to a new pro template, but the part and assembly files still will be student versions.
you're customer would have to rebuild in a comercial version. now if you are making parts for the school no issue since it is for education, but for profit no.
Message was edited by: Lenny Bucholz