11. Every Swiss citizen shall have the right to settle at any place within Swiss territory, if he possesses a certificate of origin or some similar paper. In exceptional cases the right of settlement may be refused to, or withdrawn from, those who, in consequence of a penal conviction, are not entitled to civil rights. The right of settlement may, moreover, be withdrawn from those who, in consequence of serious misdemeanors, have been repeatedly punished; and also from those who become a permanent charge upon public charity, and to whom their Commune or Canton of origin refuses adequate assistance after having been officially asked to grant it. In Cantons where the system of local relief obtains, the permission to settle, if it relates to natives of the Canton, may be made dependent on the condition that the parties are able to work, and have not hitherto been a permanent charge upon public charity in their previous place of residence. Every expulsion on account of poverty must be approved by the cantonal government, and previous notice given to the government of the Canton of origin. A Canton in which a Swiss establishes his domicile shall not require security nor impose any special obligations for such establishment. Nor shall the Commune in which he settles require from him other contributions than those which it requires from its own citizens. A federal law shall fix the maximum fee to be paid the registration office for a permit to settle. 12. Persons settled in Switzerland shall, as a rule, be subjected to the jurisdiction and legislation of their domicile in all that pertains to their personal status and property rights. Federal law shall determine the application of this principle, and shall also make the necessary regulations to prevent double taxation of a citizen. 13. A marriage contracted in any Canton or in a foreign country, according to the laws there prevailing, shall be recognized as valid throughout the Confederation. 14. The Cantons by law shall provide against all abuse of the freedom of the press, but such legislation shall be subject to the approval of the Federal Council. 15. Citizens shall have the right to form associations, so far as they are not, either in their purpose or methods, illegal or dangerous to the state. The Canton by law shall take the measures necessary for the suppression of abuses. 16. All the Cantons are bound to treat the citizens of the other confederated states like their own citizens, both in their legislation and in judicial procedure. 17. Civil judgments, definitely pronounced in any Canton, may be executed anywhere in Switzerland. 18. The exit duty on property leaving one Canton for another (_Abzugsrechte_; _la traite foraine_) is hereby abolished, as well as rights of first purchase (_Zugrechte_; _droit de retrait_) by citizens of one Canton against those of another Canton.[46]