Mr Julien Horn > De Gaulle Fleurance & Associés > Paris, France > Lawyer Profile

De Gaulle Fleurance & Associés
75008 PARIS
Julien Horn photo

Work Department

Operations Division: The transactional and litigation activities of the Operations Division cover industrial and commercial activities and more generally clients’ operations (sourcing, sales, promotions, concessions and public procurement contracts) and the defence and optimisation of their immaterial assets.


Firm partner, Julien Horn focuses on information technology and intellectual property litigation. He also handles transactional and contractual work on IP and IT assets. Julien Horn’s litigation practice is prominent in the field of software litigation, patent litigation, and trademark litigation. He has also acquired significant expertise in the planning and monitoring of innovative mass litigation campaigns for IT and software companies. He regularly publishes articles on IP and IT issues in the legal press and teaches IP/IT litigation strategy to postgraduate students at Paris University. Julien Horn was elected by his peers “Lawyer of the Year 2013 in Intellectual Property” and “Lawyer of the Year 2010 in Information Technology” by Best Lawyers (in partnership with Les Echos).


French, English.


Julien Horn was admitted to the Paris Bar in 1994.


Postgraduate degree (DESS) in Intellectual Technology and Intellectual Property Law (Paris-XI University, 1992); Postgraduate degree in Business Law (Paris-II University, 1991).

Lawyer Rankings

France > Industry focus > Industry focus: IT, telecoms and the internet

De Gaulle Fleurance & Associés is currently acting for a major TV broadcaster in a dispute with a group of internet providers arising from a change in the client’s business model which now imposes the payment of royalty fees on parties distributing ISP and TV service packages in France. Louis de Gaulle and Georgie Courtois recently advised Groupe BCPE on the negotiation with Apple of the contractual aspects of a contactless biometric payment system in Europe, as well as on the setting up of an API banking platform in France to allow financial applications to connect with the client’s banking networks. Also notable are Cécile Théard-Jallu and Jean-Marie Job, who advised on the regulatory and data privacy aspects of the launch of an e-health company’s connected nutrition scanning device in France and the US. Practice co-head Julien Horn, ‘very accurate and excellent‘ senior counsel Matthieu Dary and Jean-Sébastien Mariez are also key contacts.

France > Intellectual property > Intellectual property: copyright

Within: Leading individuals -

Julien Horn

De Gaulle Fleurance & Associés

Louis de Gaulle and Julien Horn jointly head the copyright offering at De Gaulle Fleurance & Associés, which was recently strengthened by the arrival of Sandra Strittmatter from LMBE. The group is currently advising on a copyright infringement claim brought by two authors against the client, a major cinema production studio, and an international publisher instructed the team to represent it in an action filed by the heir of a famous individual regarding the use of posthumous materials in a biography. Charles-Edouard Renault is also a key name to note within the practice and recently oversaw non-contentious mandates in the television and cinema sector such as co-production agreements and output deals.

France > Intellectual property > Intellectual property: Patents

De Gaulle Fleurance & Associés advises on the negotiation of R&D agreements, the intellectual property aspects of corporate transactions and the implementation of employee-inventor policies. The team is jointly led by Louis de Gaulle and Francine Le Péchon-Joubert and represents clients such as Groupe Cahors, R Santé and Alstom. In recent highlights, a large team of partners handled the intellectual property aspects of a joint venture between a rail company and a regulatory agency for the development of a new generation of high-speed trains, including patents and know-how. Other key names include Cécile Théard-JalluBlandine Fauran and Julien Horn.

France > Intellectual property > Intellectual property: Trade marks and designs

De Gaulle Fleurance & Associés‘ client roster includes enviable names such as Château de Versailles, which recently instructed a team led by Julien Horn to oversee the administration, licensing and prosecution of its worldwide trade mark portfolio, as well as a dispute with an ex-licensee on the grounds of the fraudulent registration of trade marks. Other notable names include Louis de GaulleFrancine Le Péchon-Joubert and Serge Lederman, who is currently representing Mango in separate copyright, unregistered designs and models infringement proceedings brought by Chloé and Gas Bijoux. The arrival of Sandra Strittmatter from LMBE significantly strengthened the offering following Philippe Moncorps‘ arrival from TF1 in 2017. Palais des Thés, Skechers, Haribo and Etam are also names to note among the practice’s blue-chip clients.

France > Media and entertainment > Media and entertainment: advertising

The multi-disciplinary practice at De Gaulle Fleurance & Associés covers the full gamut of media and entertainment sectors and represents heavyweight clients such as Stade Français, Paramount and 20th Century Fox. Julien HornLouis de Gaulle and Philippe Moncorps acted for a major TV broadcaster in a dispute with a telecom operator which filed trademark and copyright infringement proceedings, and ‘great leader‘ Charles-Edouard Renault – who ‘can make things move quickly in a slow-moving landscape‘ – advised a global technology company on a range of issues including French law matters pertaining to the production of an original series. Rhadamès Killy represented an athlete in his club transfer as well as in defamation litigation against a rival fan in the criminal court of Ajaccio. Also notable is Jean-François Vilotte, who is assisting the national ski instructors union with several matters including criminal charges, and is currently guiding a major sports federation through litigation proceedings brought against an illegal match ticket reseller.

Paris > Secteurs et industries > Technologies de l’information, informatique, internet et télécoms

De Gaulle Fleurance & Associés représente une grande chaine de télévision dans un litige face à plusieurs fournisseurs internet, s’opposant au nouveau modèle commercial du client et notamment au paiement de royalties. Louis de Gaulle et Georgie Courtois ont assisté Groupe BCPE dans ses négociations contractuelles avec Apple, concernant l’adoption d’un système de paiement biométrique en Europe, ainsi que sur la mise en place d’une plateforme de paiement en France. Cécile Théard-Jallu et Jean-Marie Job ont assisté une entreprise d’e-santé pour le traitement de questions réglementaires et de données personnelles liées au lancement d’un nouveau système connecté en matière de nutrition, en France et aux Etats-Unis. Julien Horn, ‘l’excellentMatthieu Dary dont le ‘jugement est sûr’ et Jean-Sébastien Mariez clôturent la liste des principaux intervenants au sein du cabinet.