Unfortunately, the blog post is somewhat flawed. In the CA law he references, it clearly states that the exception to you owning your code/ideas is if they "relate at the time of conception or reduction to practice of the invention to the employer's business, or actual or demonstrably anticipated research or development of the employer."<p>While IANAL, the consensus on a number of websites is that, while working for a tech startup, anything that you do in your free time could technically belong to the company you work for as its related to your "employer's business."