David Masson > Dentons > Paris, France > Lawyer Profile

75008 PARIS

Work Department

Intellectual Property and Technology


David Masson is a Partner in the Paris office and specializes in Intellectual Property, Medias and Technologies.


David’s practice largely consists of providing advice and litigation on Intellectual Property and Information Technology law regarding the acquisition, enhancement and exploitation as well as defending such rights. David carries out both the civil and criminal proceedings for infringement of Intellectual Property rights including anti-counterfeiting and patents.
His expertise covers the fields of telecommunication, media, audiovisual, entertainment, music, luxury goods, life sciences and matters concerning Information Technology including data protection.

Joined Salans (now Dentons) in 2006
Rambaud Martel, (1998 – 2006, Partner in 2004)
Lecturer at Sciences Po (since 2009)
Neutral before the WIPO (in particular for FRAND issues)


English, French


Admitted to the Paris Bar in 1998
Member of International Trademark Association (INTA)
Member of French Association of Experts in Trademark and Design law (APRAM)
Member of French Industrial Property Lawyers Association (AAPI)


University of Montpellier, Doctorat (PhD) in Law (1997)
University of Montpellier, D.E.A. in Intellectual Property Law (1993)
Certified in France as a specialist in Intellectual Property Law

Lawyer Rankings

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

Dentons‘ senior counsel Isabelle Leroux recently obtained a favourable decision at the appeal stage of a software and unfair competition claim brought by Dassault on behalf of the Airbus Group, and David Masson is advising Nokia throughout Europe on the GDPR compliance of its recording of street-level data. The firm is also assisting Scalefast with all contractual issues relating to its cloud platform and e-commerce structure.

France > Industry focus > Industry focus: Luxury goods

Odile Caron is senior counsel within Dentons‘ commercial and distribution practice and a key name to note within the luxury group alongside intellectual property specialist David Masson, tax expert Sandra Hazan and corporate partner Jean-Marc GrosperrinPascal Chadenet is part of a multi-disciplinary team advising an independent designer fashion house on its strategic partnership with an international group, while Olivier Genevois assisted Piquadro with its acquisition of the entire share capital of Lancel. The team was recently strengthened by the arrival of Marianne Schaffner from Dechert LLP; she represented a heavyweight luxury client in a major cross-border trademark infringement and unfair competition action against a fashion group. Other key names include senior counsel Isabelle Leroux and Frédérique Meslay-Caloni, who is part of the employment and labour team.

France > Intellectual property > Intellectual property: Patents

Dentons recently recruited the ‘hard-working, extremely responsive and strategically brilliant‘ Marianne Schaffner from Dechert LLP; one client describes her as ‘by far the most knowledgeable and best prepared patent litigator in Paris‘. She joins David Masson, who is currently representing a global technology leader in French proceedings against a competitor in the telecoms space, and leading the advice to clients regarding FRAND and European patent law issues. Of counsel Pierre-Olivier Ally and associate Clémence Boland arrived alongside Schaffner to join the ranks of counsel Clément Monnet and consultant Michel Vivant. The firm also gained a number of new clients including Essilor, Pierre Fabre and St-Gobain.

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

At Dentons, the intellectual property team recently gained Marianne Schaffner and her team, who arrived from Dechert LLP, as well as several new clients including Sandoz. Associate Clémence Boland – who arrived with Schaffner and Pierre-Olivier Ally – recently acted for Square in several trade mark infringement cases in the French and European courts, and senior counsel Isabelle Leroux is currently representing Merial in litigation against Virbac arising from the defendant’s registration of the European ‘Frontline’ mark. David Masson leads the practice and recently collaborated with counsel Clément Monnet to assist Polaroid with the protection and enforcement of all of its European assets, including R&D arrangements. Other key clients include Wavestone, CGI, Delta Air Lines and Lactalis.

France > Media and entertainment > Media and entertainment: advertising

Dentons‘ David Masson recently acted for several high-profile luxury brands on a host of issues pertaining to their advertising campaigns, including intellectual property, contentious and regulatory matters. Senior counsel Isabelle Leroux is currently advising a major food and drinks company on a free riding and copyright dispute arising from the broadcasting of one of its festive advertising campaigns, while counsel Clément Monnet is part of the team which provides ongoing advice to an international agency on a variety of issues, most recently regarding actions brought by parties alleging illegal advertising.

France > Industry focus > Industry focus: Healthcare and life sciences

The ‘involved‘ healthcare offering at Dentons is noted by clients for its ‘responsiveness and accuracy‘, especially in the area of ‘regulations and compliance issues‘. Practice co-head Pascale Poupelin ‘knows exactly what in-house lawyers expect‘ and is distinguished by her ‘pertinent legal advice regarding market access for drugs‘. In recent highlights, team co-head Jean-Marc Grosperrin collaborated with tax expert Sandra Hazan and IP specialist David Masson to advise Servier on several investment ventures with startups operating in the connected devices space; the team also acted for Servier in a strategic partnership with Swiss biotech company GeNeuro to develop and commercialise products to treat MS. On the M&A front, François Vignaud represented longstanding client Pfizer in the sale of its global infusion therapy business to ICU Medical. Marianne Schaffner recently joined the firm from Dechert LLP with counsel Pierre-Olivier Ally to strengthen the intellectual property and contentious offering.

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

Chez Dentons, Isabelle Leroux (senior counsel) a récemment obtenu un arrêt favorable pour le compte d’Airbus, dans un contentieux en contrefaçon de logiciel et en concurrence déloyale au long cours, impliquant notamment Dassault. David Masson conseille Nokia sur la mise en conformité d’un système d’enregistrement avec les exigences du RGPD. Le cabinet conseille enfin Scalefast pour la gestion de toutes ses questions contractuelles touchant à ses plateformes cloud ou d’ e-commerce.