It is not once nor twice but times without number that the same ideas make their appearance in the world. Aristotle
Wil Schroter’s article “Why investors don’t sign NDA’s” is brief, well written and accurate in an anecdotal sort of way.
Here’s the most important concept:
“You may have the world’s most amazing idea. It may be a complete pile of rubbish. Either way, it’s not about ideas. Investors want entrepreneurs, not ideas. Anyone can come up with a great idea, but very few can actually pull them off. It’s not that Mark Zuckerberg just happened to steal an idea for social networking. It’s that he was the most capable person to actually pull it off. It’s not like he was the first (Friendster) or the first to be successful (Myspace).”
There are an unlimited number of ideas, but a very limited number of people who know it could BE different.