Licensing information is not stored in a computer readable format, it's just a template on the page. You'll need to get a list of license templates and look for them in the text.
So, how do you get the license of a image? Seems there is no straightforward way.
For example, http://commons.wikimedia.org/wiki/File:Turner,_J._M._W._-_The_Fighting_T%C3%A9m%C3%A9raire_tugged_to_her_last_Berth_to_be_broken.jpg is in the public domain.
Thanks,
Zhao
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