Ruling no 1119 of 25 November 2020 (17-19.523) – Cour de cassation (Court of cassation) – Labour Chamber ECLI:FR:CCASS:2020:SO01119 – IP addresses and log files (prior to the entry into force of the GDPR) : personal data that must be declared in advance to the National commission on information systems and freedom and that may be produced in court, in the absence of a prior declaration, if the infringement of the employee’s personal life is justified regarding the employer’s right to evidence and if such production is indispensable.