It is also a violation of the licensing agreement to use 6.03 or any other version after 30 days without registering it. This is nothing new. The only "new" part is that you dont have a little box to check saying dont show this reminder again.
Course, if you just register it as you should, you wont see the screen any more. problem solved.
"Gee, i dont want to be reminded i'm supposed to be paying to use this shareware" isnt much of a reason for not using something, imo, but to each his own.