At a time when the world is going digital and transactions are becoming increasingly paperless, the team’s lawyers are there to support you on a day-to-day basis, so that you can keep abreast of all the new innovations in a safe and secure manner.
Our team supports businesses in navigating technological transformations and the ever-evolving landscape of French and European regulations governing digital activities—the lifeblood of today’s enterprises. Through constant legal and technological monitoring, we provide a comprehensive perspective and tailored solutions to address the complex challenges of the digital era.
Our expertise encompasses all aspects of digital law. With extensive experience in contract law, we assist clients in drafting and negotiating complex IT contracts, addressing issues related to the dematerialization of transactions, ensuring transaction security, and managing strategic digital transformation projects. In addition to our advisory role, we also represent and defend our clients’ rights during expert investigations and in proceedings before competent courts.
Our practice extends to emerging technologies and innovation, where we provide in-depth legal guidance on topics such as artificial intelligence (AI), drones for surveillance purposes for instance, connected vehicles, the Internet of Things (IoT), smart city infrastructures, and intelligent digital environments. These cutting-edge fields, situated at the crossroads of innovation and digital rights, demand an expert and tailored approach to each project.
In the area of e-commerce and distance selling, our team has extensive experience supporting B2B, B2C, and B2B2C enterprises, ensuring optimal compliance with legal rules and the constant evolution of regulatory requirements.
Thanks to our international network of partners, we also provide guidance on cross-border projects, ensuring the legal compliance of initiatives across multiple jurisdictions.
Pragmatism, efficiency, and expertise: our team is your trusted partner for navigating the complexities of the digital world with success.
“Marie-Hélène Tonnellier is a well-known name in the technology sector and is a regular presence at major technology law conferences, both as a participant and as a speaker. She has an incredible level of expertise and is always very responsive. She works tirelessly for her clients and is passionate about achieving the best outcomes for them.”
Chambers 2026
“Marie-Hélène is a very reliable adviser, and the quality of her advice is highly appreciated.”
“She is an excellent lawyer who listens to the client and is highly appreciated by our team.”
“Marie-Hélène Tonnelier has always responded perfectly to our needs, with great responsiveness and availability, demonstrating an excellent ability to analyse cases.”
“She is an excellent lawyer with strong market knowledge to advise us.”
Legal 500 EMEA 2026
“A dynamic team of digital law experts who demonstrate a very high level of responsiveness.”
“Potential clients should know that OYAT excels in providing tailored solutions for businesses navigating the digital landscape. Their ability to bridge the gap between legal frameworks and technological advancements makes them a trusted partner for innovation-driven organizations.”
“OYAT’s IT and internet practice is highly regarded for its deep expertise in handling complex legal issues. The team’s ability to address matters such as IT contracts, data protection, and emerging technologies like AI ensures that clients receive cutting-edge and commercially sound advice.”
“Marie-Hélène Tonnellier stands out as France’s premier authority in TMT law, and she’s my go-to expert for all things technology, intellectual property, and data privacy. Her presence dominates top tech law conferences, her thought leadership shapes the field, and her blend of professionalism and approachability makes her truly a one-off.”
“Marie-Hélène Tonnellier and her colleague Camille Guyot are skilled at providing concise and comprehensive legal analyses and finding the right arguments to defend their clients. Furthermore, they also know how to proactively offer solutions to their clients.”
“The team stands out for its technical mastery of contractual issues related to intellectual property, liability, and cybersecurity, while remaining pragmatic and solution-oriented.”
Décideurs / Leaders League 2026
Innovation, technology & telecoms
Best Lawyers 2027
Best Law Firms 2027
