결국 애드센스 광고를 추가로 수정해서 자신들의 광고수익을 최대화하겠다는 뜻인것 같더군요. 참고로 이메일 전문을 공개합니다.
AdSense Referrals - Google Pack Update
We wanted to let you know about some exciting updates to the Google Pack that will affect how you promote Pack referrals.
We've added two new applications to make your PC even safer: Symantec's Norton Security Scan, which detects and removes viruses, and PC Tools' Spyware Doctor Starter Edition, a top-rated anti-spyware utility. Both are free and include automatic protection updates with no paid subscription required.
Note that Norton AntiVirus 2005 SE and Ad-Aware SE Personal are no longer available in the Google Pack and should not be promoted as part of the service.
Google Pack Screensaver has undergone a significant update and is now called Google Photos Screensaver. Now you can turn your computer into a digital picture frame that displays pictures from photo feeds—continuously updated streams of photos from the web.
Please update your content and advertising to reflect these changes as soon as possible to ensure that your users don't get confused when they reach the Pack website.
Thanks for your continued support of Google Pack referrals!
The Google AdSense Team