Questão jurídica principal
Whether the public-law appeal against the interlocutory order requiring security for costs was admissible.
Decisão extraída
Yes. An order requiring security for costs, under threat of inadmissibility, can cause irreparable legal harm and is therefore appealable.
Fundamentação extraída
The Court treated the order as an incidental decision within Art. 87 OJ because it concerns a procedural step before the final judgment and may prevent a later remedy.