Google AdSense has updated their policies. You can see their updated programe policies:
https://www.google.com/adsense/support/bin/answer.py?answer=48182
As usual, JanSense has been among the first, if not the first one that write about this policy update. While Inside AdSense claims that “nearly all of the policies themselves have stayed the same”, JanSense has pointed few major changes:
Referrals
Publishers are now allowed […]