You wouldn't own their changes to it. I.e. they take what you gave them, build on it, and now they own it and not you. I imagine they are looking for a novel id

You wouldn't own their changes to it. I.e. they take what you gave them, build on it, and now they own it and not you. I imagine they are looking for a novel idea that they can own for $10k and then they will implement into Office "the Microsoft way" for about $500k+.