Whats interesting about this situation is not essentially the relationship between google and montblanc, it is the relationship between google's operating procedures and their clients. Think about the precedent this would set and the message it would send to google's other Adwords clients; It is in Google's best interest from a business perspective to withhold this information until they are inevitably court ordered to do so. Releasing the information to montblanc would broadcast an image that Google disregards client data and privacy, destroying credibility and ultimately affecting their bottom line. Adwords is Google's cash cow, and they will protect it in whatever ways necessary.