Why not just ask for a permission from the management? Drop 'em an email, explain what kind of side projects you plan and that the work will be done strictly in

Why not just ask for a permission from the management? Drop 'em an email, explain what kind of side projects you plan and that the work will be done strictly in your free time and not interfere with you work for them. It's 99% that they'll answer it's OK, it's at that early point insignificant issue for them, and later that email response is legally binding as much as any contract. Of course, it's a smart move that you get a legal advice how to phrase the question to cover your ass properly for your state/country laws.