Bryan Tong Minh wrote:
I already started something some time ago on http://commons.wikimedia.org/wiki/Commons:Machine_readability. It allows you to extract all information provided by the {{Information}} template and some other templates. It's not yet finished; I'm still think what is the easiest way to fetch license information.
Bryan
The most reliable method used to be checking the categories for license tags. Maybe create a list of license tags, from Category:License_tags then look for them on article page?