What does an Exclusive License mean under the Patents Ordinance?

An “Exclusive license” means a license from a proprietor of, or an applicant of, a patent which confers on the licensee, or on the licensee and persons authorized by him, to the exclusion of all other persons, including the proprietor or applicant, any right in respect of the invention, to which the patent or application relates, and “exclusive licensee” and  “non-exclusive licensee” shall be construed accordingly.