An 'saisie-contrefaçon' is a legal procedure designed to enable the owner of intellectual property rights (such as patents, trademarks, copyrights, etc.) to prove that his rights have been infringed and to obtain the seizure of infringing goods.

An intellectual property lawyer specialized in saisie-contrefaçon can play an important role in an infringement seizure by representing the applicant (especially patent holders) before the competent courts. They can assist the applicant in establishing the necessary facts and evidence to support the seizure request. Subsequently, they will file their request ex parte (in the absence of the opposing party) to obtain authorization for seizure operations at the infringer's premises to retrieve evidence of the nature and extent of the infringement (technical and accounting documents).