As it has done repeatedly in Europe, Google Ireland "licenses" the American web giant's Adwords technology, through which it makes most of is money, to other subsidiaries in Europe
Now I might be mistaken, but I believe this is completely wrong.
If I understand correctly, Google Ireland is not licensing Adwords to other European subsidiaries; it is simply the only Google subsidiary selling ads in Europe.
If you go to Google France and you ask them about ads, they will advise you, then put you in contact with their counterparts in Ireland who will sign the actual contract. Google Ireland pays Google France a small stipend for their services, and keeps most of the money.
The problem in Europe is not the licensing of technology; it is the European law which allows Google Ireland to sell in other countries while only paying taxes in Ireland... (And as a separate issue, to pay almost no taxes in Ireland through licensing arrangements involving Netherlands, but that's a separate issue, which Europe is trying to fix)