The free versions of our software are fully working versions. Some of them display a reminder message every time they are run, and some display a message at other times, no more than once per day. They use a use-days concept, where only the actual days you use the product count towards the trial period. After the trial period has expired, some features will be restricted. Once you have purchased the software, you will receive a serial number that you can enter to unlock the software and allow you to use the full version without limitation.