how do I protect my idea when presenting it to a potential partner?
Don’t ask the VCs to sign an NDA. They’ll laugh you out the door. VCs hate NDAs. Make an audio or video recording of the meeting. Create an email history: an email before the meeting indicating what it is you’ll be discussing, and an email after the meeting indicating what you discussed. Avoid discussing sensitive information over the phone–use email since it leaves a trail. You’re only hope is to document, document, document. And don’t worry too much about somebody stealing your idea.