[Electriclight]

If you want to record the sounds of the piano just as you hear them, then you need to run a stereo cord from the back, into an audio interface (Use the Soundcard Wizard on this Site) and record into some kind of software (Audacity is free, if you buy an interface for $100 or so, it will probably come with good software).

If you want to capture the MIDI, then it can be done through the USB interface that is part of the Yamaha. However to then hear music, the MIDI must be played back through some type synthesizer, either the stuff included in WiIdows, or free or commercial plugins running in some software like Audacity.

I don't know anything about your problems with recording permissions. You should probably contact Yamaha support on that issue.

Good luck, Dave