 Another common form of cultural preservation rights are exclusion rights, that is, the right of a cultural group to refuse to admit others to territory or membership, because of a worry that more generous terms of admission threatens to undermine it by, in effect, diluting it. Just as states have the putative right to control their borders (discussed below in section 3), and who can claim membership rights even after admission, so do some sub-state jurisdictions claim this double right of exclusion, citing the importance of cultural preservation. Indigenous communities have sometimes claimed the right to exclude non-Indigenous individuals from settling on their territories or the right to exclude others (for example non-Indigenous spouses of Indigenous persons) from certain membership benefits, including the right to vote (or otherwise have a say) for those who will govern. State courts have been asked to adjudicate the rightful authority of Indigenous communities to make these determinations (see Song 2005).