This doesn't mean film makers and other employers are or should be *forced* to do it. If you want credit, feel free to negotiate the point. But there is no leg

This doesn't mean film makers and other employers are or should be *forced* to do it. If you want credit, feel free to negotiate the point. But there is no legal precedent for forcing it once you are paid for your work. By default, the work belongs to your employer once you are paid.