The weekend was used exclusively for user research, concept validation, and some wireframing.
(My partner's work - a mock website and logo - couldn't be used after the weekend.)
Techstars has its own guidance regarding IP, but it's rather hand-wavey. I was surprised by this when I later found out that only 25% of teams continue working together.
> "As with any startup, the team decides. Techstars Startup Weekend doesn’t support or take part in the signing of any legal documents at the events themselves, and while Mentors with legal backgrounds are often present and able to give general advice, they are not permitted to give specific legal counsel. While it doesn’t hurt to be clear about your individual expectations from the start, we’ve found that teams who don’t spend time addressing this issue until it actually matters (i.e., there is a tangible product to have ownership of) are much more productive and successful than those who do."