Don’t kill the messenger, I’m only delivering the bad news.
As a tech services company, we see lots of clients who are in love with their idea. They try to protect it from disclosure with NDAs or by revealing only partial information about it to us. I’ll always remember when a prospective client in New York City made me manually sign an NDA before he would have breakfast with me. He didn’t trust electronic NDAs.
In court, NDAs usually aren’t worth the paper (or PDF) they’re printed on. That’s because ideas usually aren’t unique. The world is full of ideas. If you have one, about a million people probably have almost the exact same idea. About 50,000 people might have tried to execute it to some degree. About 5,000 people might have made an organized effort at developing it. And about 300 or 400 people might already have some results from a variation of your idea. It’s hard to prove in court that someone stole your idea if many people already use it.