Google recently sent out a letter to users of its AdSense, DoubleClick for Publishers, and DoubleClick Ad Exchange products.  It looked like this:

Dear Publisher,

We want to let you know about a new policy about obtaining EU end-users’ consent.
It clarifies your duty to obtain end-user consent when you use products like Google
AdSense, DoubleClick for Publishers, and DoubleClick Ad Exchange . . .
Please ensure that you comply with this policy as soon as possible, and
not later …
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