[any ANONYMOUS forum user]

I have a nice collection of adult/porn/sex/XXX videos on my HD. The problem is that my little kids and my parents use my PC from time to time. I would like to hide these videos as well as some other private stuff from them. What is the best way to do that? Can I add some kind of DRM to the videos so that they can only be watched when I enter my password? Please no software that needs Internet connection for functioning.