I'm building a plugin for Address Book (in Mac OS X) where the postal code is returned by the GeoNames API. As I don't control the interface (it's a plugin after all) I can't mention the GeoNames reference as stated in the Creative Conmmons License.
I included a NOTICE file with a reference to GeoNames (as one would do in the Apache license) and I will mention GeoNames on the download page for the plugin.
Would this be sufficient or would I break the license by not mentioning GeoNames in the interface?