That means the software is limited therefore its licence is either DEMO or TRIAL. Typically, after you buy the application and acquire a licence and activate the software, you should be allowed to use it in its full form without any more nag screens or messages.
I've checked the official website, but it doesn't appear that they established a Sales page, therefore you will have to get in touch with the developers through the following page: http://ibspl.com/location.php
