This article examines the legal and procedural framework adopted by French authorities in investigating encrypted communication platforms, with particular reference to the Sky ECC case and its implications for European judicial cooperation. While courts across Europe have increasingly addressed the admissibility and legality of evidence derived from such platforms, France’s approach remains comparatively underexplored. The study analyses the evolution of French legislation on techniques spéciales d’enquête (special investigative techniques) and the balance it seeks to strike between security imperatives and procedural safeguards, including judicial oversight and the invocation of state secrecy. It further evaluates the evidentiary impact of cross-border data exchanges conducted under the European Investigation Order (EIO) regime, drawing on recent national and EU-level jurisprudence. By reconstructing the French legal framework and its interaction with EU mechanisms, the article offers a critical assessment of the legitimacy, evidentiary usability, and prospective regulation of high-tech investigative practices within Europe - particularly where such practices originate from, or depend on, data captured within national jurisdictions.
Christian Pallante (Sat,) studied this question.