If you've previously paid for goods with Bitcoin or other digital currency in California, you're technically a criminal -- the state has long had a law requiring US dollars, even if it hasn't been enforced. As of this weekend, though, you're officially in the clear. Governor Jerry Brown has signed a bill that legitimizes payments with Bitcoin, other forms of virtual money, community currencies and reward systems like coupons and points. As state assembly member Roger Dickinson explained when fighting for the measure, modern commerce has "expanded" beyond cash and credit; to him, it only makes sense that the law keeps up with the times.