PLANO (June 28, 2011)—The Dr Pepper Snapple is suing one of its own bottlers over what it says are license agreement violations.

The Plano-based beverage maker filed suit Tuesday, alleging that Dr Pepper Bottling Co. of Dublin is selling Dr Pepper beyond the six-county territory allowed under its license agreement and that the company is wrongfully selling soda with "Dublin Dr Pepper" labeling on packaging and other merchandise.

The bottler, according to the company, is marketing a version of Dr Pepper made with cane sugar as "Dublin Dr Pepper." ‘

The Dublin plant is one of several bottlers authorized to make the drink with cane sugar, but it's not allowed to modify the name and logo as such on the labeling, according to the agreement.

Dublin Dr Pepper, which is the world's oldest Dr Pepper bottler, said it was surprised by the lawsuit but confident that its corporate partner will not succeed in its efforts.