That depends on what license Jane used for her contributions. A contributor license agreement (CLA) would make that a lot clearer in the case that she submitted

That depends on what license Jane used for her contributions. A contributor license agreement (CLA) would make that a lot clearer in the case that she submitted her contributions back to the main project. If I used L0, I would definitely have a CLA. If she forked it and maintained her fork separately, it seems simple enough how things work if she updated the license file. You'd just end up with the combination of her new license and Bob's old license. However, it is a little unclear what it means if she didn't change the license file. How can you be sure that she just hadn't yet gotten around to updating the payment information?