On the other
hand, sparkling wine from California ''is'' called
champagne. Trademarks, especially in the international arena, are seldom
absolute.
It's a bad example anyway, because 'Champagne' is not a trademark. A
trademark
is owned by a single company (although it might allow others to use it).
"Champagne" is a _product name_ (and the European Union has specified that
only when it is created in a certain region, the product name may be used).
One cannot confuse American champagne with the real stuff. It's all in
the taste. Some producers do use the expression that their sparkling
wine is produced in the "méthede champennoise".
Ec