Hi,
I used Visual Paradigm, the community edition. If you create one diagram per project, you will get a litle watermark on the left top corner of the exported diagram image, easily erazable with any graphic tool you got.
Otherwise, if you create more than one diagram in the same project, then you will get a lot of watermarks disposed at different place on all your exported diagram image.
...Will this be a problem for the exam?
Is it worthy to take this risk ?