GreenForce-Player is an portable alternative media player, with many additional functions. One of these functions is to protect media files. You can encrypt your audio and video files with a password and protect them against screenshots. An other very interesting function is the coverflow. Last but not least, there is a cache system that is used to reduce usage of your hard disc. This software has been developed for Windows. GFP is easy to use and therefore ideal for beginners. However, there are also advanced functions for professional usage.
You can use GFP also as video encryption tool for free in commercial projects.