Hello, Using LabVIEW, the only option I can see you pursuing is to use a timestamp to take the current time (first time the program is run), write this value to a registry key, read the registry key during each subsequent program compilation, take the difference between the current time and the stored registry time, determine whether the time difference is greater than 30 days, send the (expired?) Boolean to a case structure, and lock the front panel if the time is expired. The only downside to this method is that the registry key can potentially be found and modified by your trial user, OR the computer clock can be reset or moved backwards in order to lengthen the trial time.
As you can see, this would take some meticulous programming, so you may want to use the third-party software that was recommended in order to "shell" the VI and lock the entire program once it expires. I hope this helps. Good luck! Joe Des Rosier Applications Engineering
