Do you think Microsoft will be around in 10-20 years? Do you have a good idea of what you'll be working on (or interested in) in 10-20 years? Do you think laws regarding the forms of IP will be much better in 10-20 years? Do you think you'd get caught now or in the next 10-20 years if you do use this as research (or even rip code directly from it) and get sued for making money off it? Plug in your guestimations and make a decision. I looked at it, myself.