source: Each license is given a nkmber.
target: License version number is unique.
references: License version number is unique. Each version of the License is given a different version number. Each version of the License is given a unique version number. Each version of the License is given a distinguishing version number. Each version of the License is given a distinguishing version number. A distinct version number is given to each version of the License. Each form of the permit is givin a different version number.