The difference is that the way Google used the APIs is not compatible with code use under the GPLv2 (in particular, they didn’t GPLv2 license it). If the origin

The difference is that the way Google used the APIs is not compatible with code use under the GPLv2 (in particular, they didn’t GPLv2 license it). If the original code implementing the APIs is Apache licensed however, you have a very free hand in changing the original code so you probably wouldn’t care about your working being considered a derivative of it. I’m not sure that absolves you categorically but it definitely sounds like a better position to be in.