There is a web page of the guys that make DIVE+
Dive+ : We Love Ocean
Perhaps they can answer that question.
In the web page there is no mention of the price of a full version without logo in the processed pic.
I emailed them:
To: feedback@dive.plus
Subject: Suggestion for Dive+
Hi,
Your application has great feedback on scubaboard.com (link).
One of the most common feedback is that users would like to pay to be able to remove the Dive+ logo when saving the colour corrected pictures.
I personally used your software on a couple of pictures and think that your app is great and give much better auto colour correction than software not aimed at diving pictures like Gimp or IrFanView.
Please consider letting the users pay to remove the logo.
Hope to hear from you guys and thanks for writing Dive+.
T