This has a name ... a DOL !!!
In French law of contract, deceit is a maneuver of a counterparty in order to deceive her partner and cause an error at home. Fraud is, with error and violence, one of the three vices of consent. It is sanctioned by the nullity of the contract.
Article 1116 of the Civil Code provides for the fraud "fraud is a cause of nullity of the agreement when the maneuvers practiced by either party are such that it is obvious that without these maneuvers, the other party would not have contracted. It is not presumed and must be proven. "
Case law has also identified the fraud by a judgment of 30 January 1970. In the present case the Court of Appeal of Colmar has specified the contours: "all dishonest acts tending to surprise a person in order to make him sign a commitment she would not have taken if we had not used that way to her, may be qualified fraudulent tactics. "