LIMITED DEMO VERSION:http://www.hakros.com/envato/_demos/Hakros-ScreenLock-Demo.zip
The program lets you lock your desktop automatically, allowing you to keep your computer safe from outside intrusion.
You can unlock the program with a secret keyboard combination or using a pendrive or removable drive as security key.
The program also lets you download a vast number of wallpapers (from various categories) from the official server.
You can download the demo version at any time, although this version has some limited options.