Article L563-3 of the French Monetary and Financial Code
The prohibition measures taken pursuant to this chapter apply to any person who is a co-owner of the funds and to any person who holds a joint account where the other account holder is an owner, bare owner or usufructuary as referred to in the first paragraph of article L. 565-2. These measures may be invoked against any creditor or any third party who may claim rights over the funds…