The fact that an investor is investing into a business that he loves the idea behind the business should mean that that investors should never disclose the secret of that business in any circumstances so it is very important that the investor sign up for a non-disclosure agreement.A genuine investor that believes in the actualisation of your idea wouldn't have problem with signing a nondisclosure agreenent. That is the part every new innovator should trade so as to secure his idea, because when it comes to business people are selfish.