Hi, First of all i want to make it clear: This is only a concept, not a ready module to work with. I have never thought, or make any kind of research about how these stuff done by proffesional developers, so this is only a logic concept of how i see it. It probably could/should be more complicated and disguised, but as i said, it's only a concept. This module should allow to make your software work as «"n" Days Trial», so when the time is over, user will be prompt about entering a Product Key