Both assignments and trademark co-existence agreements are generally enforceable. Here, the original owner of the “Crazy Horse” trademark entered into a co-existence agreement with Russell Road’s assignor. Then the original owner assigned its rights in the trademark to Spencer. Finally, the co-existence agreement was assigned to Russell Road. Held, both the co-existence agreement and its assignment were enforceable, and the rights they conferred on Russell Road were superior to the rights of the assignee of the original owner of the trademark.