how can i charge someone to access my tutorial content?

[omg_wtf]

I'm trying to find a way to create a simple website to put up some video tutorials where I can charge a small fee to access them. Does anyone know of a simple program or wordpress plugin I can use to accomplish this?

Preferably I'd like to give a key code or password automatically whenever someone pays the fee so they can log in and access the video tutorials. I have looked everywhere and haven't found anything.

Any help would be very much appreciated.

Thanks!