about NDA: I've worked with a friend on an idea. It was my idea. Because of the way he worked I decided I don't want to continue on that project. He continued anyway. The funny thing is that even though I told him all the details of my idea and I helped him even after I stopped working, he didn't build my idea. The result was similar with what was done before and so was not enough to differentiate in the market. Essentially he did all the easy stuff without understanding why it was so important to do the hard/new stuff.