Traveling with a sense of calm

I have my sidewalk. It has all the systems in place necessary to operate. Now I need to call in Xzibit so he can "pimp my sidewalk". Actually, I won't call in 'X to the Z', he's not mellow enough. I'll probably call in a great speaker. Someone like Tony Robbins or Bill Clinton. In order to really make my sidewalks a complete and enriching experience, I will install speakers into them, and will play various motivational and soothing diatribes from some of the world's greatest speakers. The real question is, how do I record their thoughts? Well, there is a very simple way. Its called audacity. All I have to do is put a microphone in a computer jack and tell them to yap away. In order to conserve memory, I will probably use an MP3 file instead of a .WAV file. This is because this type of file takes less memory and would allow me to have a more speakers on my soundtrack list. These soundtracks will make the sidewalk a hit among the very stressed out detractors who simply look at the cost and the lack of necessity of a moving sidewalk. Once they are calmed down by the .MP3 files, they will see the convenience of the sidewalk, and will wonder how they ever lived life without one.
There really won't be too much secret information on my computer, however I want to make sure that I protect all the information that is on there. I would not want a competing sidewalk maker getting a hole of my information and using it to ruin my business. In order to do this I will have to overwrite all of my files 0s, random numbers, or the contents of a new file. People may be able to still ripe off the files, however, it seems unlikely, because it would be incredibly cumbersome and expensive. Something that probably isn't worth it in the moving sidewalk business.