When an individual provides their contact information to a company, they must expressly authorize the use of their personal data for commercial purposes. It is imperative that any collection or acquisition of contact information be accompanied by proof of consent. In parallel, the opt-out process allows each individual to revoke their authorization at any time. It is crucial that the opt-out procedure be easily accessible to all individuals listed in a database. The CNIL (French Data Protection Authority) ensures respect for these fundamental rights in this area.