Binding
“To put under an obligation; to constrain with legal authority, i.e. “The court's decision binds them to pay the fine.”
Source: Webster’s Third New International Dictionary
“To obligate; to bring or place under definite duties or legal obligations. To affect one in a constraining or compulsory manner with a contract or a judgment. So long as a contract, an adjudication, or a legal relation remains in force and virtue, and continues to impose duties or obligations, it is said to be ‘binding.’
Black’s Law Dictionary, 6th Edition