11. PEN 30-day trial
As long as PEN hasn't been activated with an activation key, it will act as a 30-day trial application. If after 30 days it hasn't been activated yet, it will disable most of its functions. You can purchase an activation key for only $5 by clicking on the "Buy Now" button on the left. To activate PEN after you have received your key, click on "Help" in the main window, then choose "Enter Activation Key". Enter your key here, restart PEN, and all features will be enabled again.