corkage n : a charge added at a restaurant for every bottle of wine served that was not bought on the premises
BYO (Bring your own) is a term used at restaurants to show that customers can bring their own drinks (usually alcoholic beverages), as opposed to Fully Licensed where such drinks must be bought at the restaurant, which would be fully licensed to sell alcohol. A restaurant can have both of these labels applied to it. Corkage fees may be applied for consuming or opening wines and other drinks at both kinds of restaurants.
corkage in German: BYO
corkage in French: Bring Your Own