'Returns delta CRL URLs - does not include complete CRLs
:return:
A list of zero or more DistributionPoint objects'

@property
def delta_crl_distribution_points(self):

    if (self._delta_crl_distribution_points is None):
        self._delta_crl_distribution_points = self._get_http_crl_distribution_points(self.freshest_crl_value)
    return self._delta_crl_distribution_points
