I am teacher on technical faculty and I recommend my students to create their engineering project in Mathcad. The grey message of Mathcad express behind the calculations makes them little hard to read and as I am going to check over hundred works each year, I would really appreciate, if the watermark could be little different. Good example is Autodesk's students versions, where i.e. AutoCAD drawing has the message that the file was created in student's version around the printed drawing. If such change would be possible, at least for students, it would be great. Or at least if the grey color could be little lighter. Anything, what would make created pdf more readable.
Unfortunately it is not possible. See image.
All in all, I think that managers in PTC have very bad business sense. There is really missing some version of Mathcad Express without watermark for let's say 20-30 $. Only those basic functions.