The module webtoolkit.aim.js is extracted from this source:
http://www.webtoolkit.info/demo/javascript/aim/webtoolkit.aim.js

The module does not include an explicit license.
In a private communication the author has told us that we can
assume the GPL3 license.

The home of the module is:
    http://www.webtoolkit.info/ajax-file-upload.html