The trial edition of EZRound has one limitation. The exported images of the design (as viewed in preview mode) carry a watermark of the EZRound logo. This will NOT be present in the registered copy.
However you CAN save your project, preview it and see everything that you can do with the program. Then when you buy the software you simply enter your registration data, then load your project file and export your work. Then the watermark will not be there.