Our conversation starts with mutual non-disclosure agreement. We maintain clients privacy & confidentiality even when we are discussing a potential engagement. Our engagement letter covers the Intellectual Property & working product's rights to clients. Here is the excerpt: "Client owns the product is the in process, finished product, as well as drafts, notes, materials, mockups, hardware, designs, inventions, patents, code, and anything else that the Developer works on—that is, conceives, creates, designs, develops, invents, works on, or reduces to practice—as part of this project"