ecommerce

I have a new idea regarding an e-Venture but I have financial and management problem therefore I contacted IT companies like Infosys, Wipro, Microland, Aptech, NIIT, Netacross etc. They are ready to invest but they told me to send the business planfor review. As you know an idea plays a vital role in a dotcom.
Therefore, I feel fear if I submit my business idea to them, first they will get my ideas and detail information, and then say they are not interested in this proposal and develop this venture themselves.
Is there any security by cyber law?
How can I protect my business plan by law?