I know that the real issue here is that most Flickr users have
absolutely no idea how to either find or change their licenses,
however two pragmatic technical pointers:
1. The flickrapi gives you back the licence based on a simple query
using the photo_id. I recently used this to double check licences
using a custom Python script during a mass upload. For Commons, it
would be not too hard to build friendly web-based simple tools to help
users check licences and even mass change their own licences in their
Flickr albums to be "Commons compatible" with a simple couple of
button presses (using oauth). The well designed Upload Wizard can do
the mass upload of their chosen albums to Commons.
2. I use a bookmarklet to quickly find images that can be used on Commons:
javascript:(function(){if("".length==0){window.location="htt…
Here is an example search for "cookies" using the bookmarklet:
https://www.flickr.com/search/?q=cookies&l=commderiv&ss=2&ct=6&…
Fae
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faewik(a)gmail.com
https://commons.wikimedia.org/wiki/User:Fae
Personal and confidential, please do not circulate or re-quote.