code: def set_pkg_licenses_concluded(self, doc, licenses):
          
          self.assert_package_exists()
          if not self.package_conc_lics_set:
              self.package_conc_lics_set = True
              if validations.validate_lics_conc(licenses):
                  doc.package.conc_lics = licenses
                  return True
              else:
                  raise SPDXValueError('Package::ConcludedLicenses')
          else:
              raise CardinalityError('Package::ConcludedLicenses')
docs: Sets the package's concluded licenses.
          licenses - License info.
          Raises CardinalityError if already defined.
          Raises OrderError if no package previously defined.
          Raises SPDXValueError if data malformed.