The winner will receive $1000 to a Paypal account of his/her choice.
You can submit as many remixes as you like. By using any content of the stems distributed, you commit to share 50% of the rights to that production with Disaster In The Universe. That also goes the other way around, so if they want to publish a remix you submitted (and you agree), they will give you a 50% cut. It is up to you if you want to enable the track(s) for downloads or not.