Article L151-4 of the French Commercial code
Abtaining a business secret is unlawful when it is done without the consent of its legitimate holder and results from: 1° Unauthorised access to any document, object, material, substance or digital file that contains the secret or from which it can be deduced, or unauthorised appropriation or copying of such items; 2° Any other behaviour considered, given the circumstances, to be unfair and contrary to commercial practice.