IANAL, but I would guess you can't simply use everything for professional purposes, this depends on the licence/copyright of said stuff. In other words if you u

IANAL, but I would guess you can't simply use everything for professional purposes, this depends on the licence/copyright of said stuff. In other words if you use copyrighted/lincenced stuff in any form or in any phase of your product without having permission to do that, you are breaking the law.