This question is not directly related with programming or software development but since this is the official Google Drive SDK support platform I’m placing it on SO.
I am the publisher of an Android application that is distributed in the usual Free/Pro format (where the Pro version provides many more features than the Free version).
At this moment I’m planning to integrate the application with Google Drive but only in the Pro version. The Free version will still show the buttons and the Google Drive branding, but as the user tries to interact it will show a message stating that the feature is only available in Pro version with the respective link to the Pro application version.
Now the question itself:
Is it legal (or allowed) for the Free application version to show the Google Drive branding, since its just advertising and not in fact integrating? If not, how should I advertise the Google Drive integration (from the Free version) that is included in the Pro version? The fancy Google Drive branding is essential to capture user attention at this point.
It is legal, but please make sure to check the branding guidelines and terms of service.