It isn't only about adsense..and thus can affect many more sites , both within and external to the EU..
Any site which has EU visitors can be affected..
Ganalytics sets the kind of Cookies that require "notification" and possibly "consent"..
[
developers.google.com...]
Explanation as to why Ganalytics is affected by EU law..
[
cookielaw.org...]
The latter is a commercial site..I have no connection at all with it..But it is the best explanation re Ganalytics and the EU cookie law that I could find..Hopefully the link will stand..
Other analytics systems may or may not be subject to EU cookie law..it depends how they work..pure "session cookies" are not a "problem"..Ganalytics ( and adsense ) sets cookies which track the visitor ( are "updated" on other sites ) after they leave the site..
Not all EU countries have the same "interpretation" about the EU cookie law, it is probably safest to respect / implement "notifications" and or "optouts" that take into account the most "draconian" interpretations as required by some EU countries..
It is possible to implement a script which looks at the GEO origin of the visitor, and serves them a "notification" and or "opt out" that complies with their own national interpretation of the EU cookie law..
It will never be 100% accurate ( due to AOL European subscribers , who can appear to be coming from any one of 4 or 5 EU countries ) ..there may well be other "edge cases"..The EU recognises this, it is to be hoped that Google, in it's PR anouncement designed to impress the EU legislators , also accept that it ( and indeed Google's own GEO -targeting and cookies set on Google's own properties) cannot be 100% accurate..
Google would not like to lose the adwords income from the EU, however IMO, Google would be perfectly willing to close down adsense to the EU, whether this meant "throwing the EU adsense publishers who receive EU traffic, and other non EU adsense publishers who receive EU traffic "under the bus", or not, Google could always bame the EU legislators..
Obviously which ever way it works, and whatver site owners do, there will be a loss of income to adsense publishers, larger traffic publishers will be able to "ride this out"..half of a great deal of adsense income per site is worth paying coders to write scripts to protect..smaller publishers will not be in the same position..