I've been asked by some of the editors on dawiki of the possibilities to create a set of questions that can lead to the correct image license(s) for image uploads. Furthermore, there is a request for enforcing a name for the photographer, so proper crediting can be done.
Looking at SpecialUpload.php, there are no hooks that is really suitable for this, and also I'm a little unsure about any effects of beginning to send people to new pages mid-upload, which would happen if added to any of the two existing hooks.
So I propose to add two hooks: One for adding fields to the initial form, and one for validating the contents before proceeding with the upload. Is there any reason that validation of license information should not be done in this way? Also, if a more suitable way of "quizzing" people exists, I'd be happy to hear about that.