Some time ago, I saw someone asking about trial software protection, and my first thought was a '30-day evaluation' mode.
I was thinking on how it can be done without using any third-party programs.
How can I detect the first run and count down (or up) the number of remaining days? And how can I securely store it on the user's computer?
I know that this might be the easiest method to crack, but it is a nice way to learn :)