Question juridique clé
Whether the federal complaint had to be dismissed for failure to cure the signature defect and provide a Swiss service address.
Solution extraite
The complaint could not be entertained because the appellants did not submit a jointly signed version and did not designate a Swiss address for service within the non-extendable deadline.
Motifs extraits
The court had warned that non-compliance would render the filing disregarded under Art. 42(5) BGG and service consequences would follow under Art. 39(3) BGG; the defects were not cured even considering the suspension of time limits.