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Linh Duy Mai

Head of IP Enforcement, Vietnam, T&G Law Firm LLC (TGVN)

Biography

Linh Duy Mai is the head of intellectual property enforcement in Vietnam at T&G Law Firm LLC (TGVN), a licensed law firm and IP agent partnering with Tilleke & Gibbins for litigation and local IP filings. Linh is trusted by multinational clients to handle both contentious and non-contentious IP matters, with a practice that spans enforcement, disputes, and the strategic commercialization of intellectual property.

Linh has assisted clients across a wide range of industries—including automotive, software, pharmaceuticals, cosmetics, fashion, and food—in navigating complex IP issues in Vietnam. Beyond leading enforcement actions against IP infringement, he advises on sophisticated IP transactions and high-value projects, including technology development and commercialization arrangements, trademark structuring following joint venture exits, and IP due diligence for technology-driven investments.

He has particular experience in technically complex disputes, including patent infringement matters and copyright disputes involving software and source code. His work in this area includes assessing originality, substantial similarity, and ownership of protectable elements, often in cases involving overlapping commercial relationships and prior shareholder interests. He has also advised on issues relating to standard essential patents (SEPs) and FRAND licensing in cross-border contexts.

Recognized as a leading IP lawyer in Vietnam by Legal 500, Managing Intellectual Property, Benchmark Litigation, IAM Patent 1000 and WTR 1000, Linh combines legal precision with practical enforcement insight. His background in the Hanoi police force gives him a unique advantage in coordinating multi-agency actions and handling matters with potential criminal implications.

Experience

  • Advised a leading U.S. multinational technology company on developing a defense strategy in a potential dispute concerning FRAND licensing of standard essential patents (SEPs), including analysis of licensing obligations and associated litigation risks.
  • Advised on complex technology transfer arrangements, including assessing a client’s ability to enter into a proposed agreement with a Vietnamese partner in light of constraints under an existing license with the U.S. Department of Agriculture (USDA).
  • Advised on and negotiated a complex agreement for the development and commercialization of a cryptocurrency trading platform, including IP ownership structuring and multi-party arrangements.
  • Conducted comprehensive IP due diligence for large-scale and high-value projects, including core software and technology for a cryptocurrency platform in Vietnam and cutting-edge energy production technologies.
  • Handled a complex copyright dispute involving an ERP software management system developed by a commissioned contractor, where the claimant alleged unauthorized copying of source code from a company in which the contractor was a former shareholder.
  • Structured and negotiated trademark usage and coexistence arrangements following the exit of a joint venture partner, addressing residual goodwill, brand transition, and enforcement risk mitigation.
  • Represented multinational clients in patent infringement and dispute matters, including pharmaceutical and agrochemical cases involving technical evidence and regulatory overlap.
  • Won a domain name dispute case at the Ho Chi Minh City Court for a German auto manufacturer. The defendant was required to surrender the disputed domain names, make a public apology, and pay the client’s legal fees. This was the most severe punishment ever dealt out by a Vietnamese court to a cyber-squatter.
  • Represented a world-leading ball bearing manufacturer to orchestrate an administrative raid. Approximately ten tons of counterfeit goods were seized. The infringer was then imposed with a record fine.
  • Litigated on behalf of a U.S.-based raisin producer and won a challenging case in which the defendant raised a copyright registration as a defense to trademark infringement.
  • Represented a world-leading manufacturer of coding, printing, and laser marking products and won a precedent-setting victory in which the court awarded record attorney’s fees to the plaintiff. Managing Intellectual Property  magazine selected the victory as its Case of the Year for Southeast Asia in 2014.
  • Represented one of the world’s leading biochemical corporations and secured a victory in a groundbreaking case of patent infringement in which the court agreed to enforce and protect an agrochemical patent for a foreign patentee against a local pesticide producer.
  • Won the second domain name dispute case handled by the Vietnamese courts on behalf of a well-known French cement producer.
  • Won a wide range of domain name disputes by virtue of UDRP proceedings before the WIPO Arbitration and Mediation Center.
  • Assisted a British multinational pharmaceutical company in an unfair competition case involving the use of misleading trade dress by a local competitor. In a rare occurrence, the enforcement body in charge of resolving the case rendered the final conclusion in favor of the client without relying on an expert opinion from the Intellectual Property Office of Vietnam.
  • Represented the world’s leading motorbike manufacturing company to enforce its rights against all types of infringement on a nationwide scale.
  • Represented some of the world’s top pharmaceutical companies from Europe and the U.S. in fights against local generic companies which infringe the clients’ patents.
  • Represented several leading software publishers to raid end-users and then force them to legalize unlicensed software and pay damages.
ABOUT Linh Duy

Industries

Automotive

Location

Languages

    Vietnamese

    English

Education

    LLB, Hanoi Law University

    BA, People’s Public Security Academy

Insights

September 14, 2026
On August 23, 2026, Vietnam’s National Assembly passed Law No. 11/2026/QH16, amending the country’s Customs Law with effect from March 1, 2027. The amendments represent a substantial reform of Vietnam’s customs-based intellectual property enforcement regime. The reforms come amid considerable external pressure. In its 2026 Special 301 review, the US Trade Representative (USTR) designated Vietnam a “priority foreign country,” citing widespread counterfeiting, weak border enforcement, limited ex officio customs powers, and the absence of controls over goods in transit. Vietnam’s legislative response signals a commitment to bringing its border enforcement practices into line with international expectations. For IP rights holders operating in or through Vietnam, the amended law introduces several tools that substantially strengthen enforcement options at the border. Closing the Transit Gap One of the most consequential amendments is the extension of IP-related customs enforcement to goods in transit. Previously, Vietnam’s customs regime applied IP controls only to goods being imported or exported, a gap the USTR had specifically identified as enabling infringing goods to pass through Vietnamese ports with impunity. Vietnam’s geographic position as a logistics hub for Southeast Asia means that substantial volumes of goods transit its ports and free-trade zones. Extending enforcement to cover these shipments brings Vietnam closer to the standard set by the EU’s customs enforcement regulation and addresses a longstanding concern of multinational brand owners whose goods are frequently counterfeited in the region. Strengthened Suspension and Ex Officio Powers The amended law introduces a dual-track suspension mechanism (Article 73(2)). Customs authorities will suspend clearance upon request by an IP rights holder (or authorized representative) who provides evidence of IP ownership, evidence of infringement, and a financial guarantee. Customs can now proactively suspend clearance on an ex officio basis if, during inspection and monitoring, they discover “clear grounds” to suspect that imported, exported,
July 27, 2026
Vietnam’s new E-Commerce Law, which took effect on 1 July 2026 along with its implementing Decree No. 248/2026/ND-CP (Decree 248), marks a significant development in the country’s approach to online intellectual property (IP) enforcement, reflecting a clear shift from a reactive model of intermediary liability to one that expects platforms to play a more active role in preventing infringement. From notice-and-takedown to platform responsibility The most significant change introduced by the E-Commerce Law is the transformation of the legal role of e-commerce platforms. The existing safe harbor provisions under the IP Law and the copyright notice-and-takedown regime established by Decree 17/2023/ND-CP (Decree 17) largely required intermediaries to act only after receiving notice of infringement. Once infringing content had been removed, the platform’s legal obligation was generally considered fulfilled. The new legislation adopts a fundamentally different approach. Article 17 of the E-Commerce Law requires intermediary platforms to screen information relating to goods and services before publication in order to prevent listings involving counterfeit or IP-infringing goods, and goods of unknown origin. Rather than relying exclusively on complaints from rights holders, platforms are now expected to implement preventive measures before infringing listings become publicly available. Decree 248 further requires platforms to update keyword filters based on recommendations issued by competent authorities. These filtering mechanisms are intended to prevent prohibited listings from appearing on the platform and represent a further move away from a purely complaint-driven enforcement model. The legislation also introduces Vietnam’s first statutory stay-down obligation. Under the E-Commerce Law and Decree 248, major digital platforms must maintain automated systems capable of reviewing, warning against, and removing unlawful listings while also implementing measures to prevent repeat violations, defined under Decree 248 as conduct that has previously been identified and handled by the platform, but continues to recur. This obligation addresses one
July 13, 2026
When Decree No. 186/2026/ND-CP (Decree 186) takes effect on July 15, 2026, it will introduce the most significant reform of Vietnam’s administrative IP enforcement framework since Decree 99/2013/ND-CP was issued in 2013. These changes are expected to make administrative enforcement faster, more accessible, and better suited to the realities of modern IP disputes. Below are the principal reforms and their practical implications for rights holders and enforcement practitioners. The End of Notarization and Consular Legalization Among the most welcome procedural changes is the abolition of the notarization and consular legalization requirement for powers of attorney (POA) submitted in administrative enforcement proceedings. Under the previous regime, foreign rights holders were generally required to execute a POA, then have it notarized and consular legalized (if seeking customs recordal). In practice, this process frequently delayed enforcement by four to eight weeks, often long enough for infringing goods to disappear before authorities could intervene. Decree 186 removes this bottleneck, now requiring only an original or certified copy of the POA. If the document is in a foreign language, a Vietnamese translation is sufficient, provided it is certified by a competent authority or confirmed by the authorized Vietnamese IP representative. Consular legalization and notarization are no longer required. For rights holders, the practical impact is substantial. Administrative enforcement files that previously took weeks to prepare can now be completed in a matter of days, allowing much faster responses in time-sensitive matters such as warehouse raids, border interventions, and trade-fair enforcement. The decree also introduces a useful administrative simplification. Where an original POA has already been submitted to the same enforcement authority and remains valid, applicants may rely on a copy of that earlier submission by identifying the previous case file. This eliminates unnecessary duplication for rights holders pursuing multiple enforcement actions before the same
April 3, 2026
On March 16, 2026, Vietnam’s Ministry of Public Security released a draft version of a new Decree on the Prevention and Combating of Cybercrime and High-Tech Crime to replace the currently effective Decree 25/2014/ND-CP. In the draft, the ministry has proposed a comprehensive regulatory framework aimed at addressing violations occurring within the cybersecurity domain, including measures related to intellectual property. Acts of Online IP Infringement Article 9 of the draft decree notably introduces specific provisions addressing online intellectual property infringement, with detailed lists of acts considered to constitute infringement in the online environment. Copyright and related rights infringement includes: Uploading or sharing works, performances, sound recordings, video recordings, broadcasts, computer programs, software, research, documents, theses, or other intellectual creations on digital platforms without the consent of the rights holder. Unauthorized livestreaming of copyrighted television programs, sporting events, or artistic performances. Uploading, sharing, storing, transmitting, or providing links to infringing works or digital content via websites, social networks, applications, or digital platforms. Providing or using software, tools, devices, or access codes to circumvent technological protection measures or evade lawful control mechanisms implemented by rights holders. Using artificial intelligence (AI) tools to replicate the ideas or structure of another person’s work without significant new creativity or without proper attribution, thereby causing damage to the original author. Industrial property infringement includes: Manufacturing, trading, advertising, or distributing counterfeit goods bearing counterfeit trademarks, geographical indications, or industrial designs, as well as goods infringing industrial property rights through online platforms. Unauthorized registration, appropriation, or use of domain names, account names, or digital identifiers that create confusion regarding the rights holder or the origin of goods or services. Producing, using, or offering for sale products containing all or part of a patented invention via online platforms. Advertising or introducing products with technical features or characteristics identical

Awards & Rankings

September 23, 2026
Tilleke & Gibbins has received eight nominations for the Managing IP Asia-Pacific Awards 2026, recognizing the strength of the firm’s intellectual property practice across Southeast Asia. The firm has been shortlisted in the following categories: Asia-Pacific Firm of the Year (Domestic) Cambodia Firm of the Year Indonesia Firm of the Year Thailand Patent Firm of the Year Thailand Trademark Firm of the Year Vietnam Patent Firm of the Year Vietnam Trademark Firm of the Year In addition, Darani Vachanavuttivong, managing partner and managing director of the firm’s intellectual property practice, has been shortlisted for Asia-Pacific Practitioner of the Year (General Law Firms). The eight nominations reflect the continued recognition of Tilleke & Gibbins’ regional capabilities in intellectual property protection, commercialization, and enforcement. The winners will be announced at a ceremony in Kuala Lumpur on November 5, 2026. For more information, please see the full Managing IP Asia-Pacific Awards 2026 shortlist.
September 23, 2026
Tilleke & Gibbins has received 14 nominations for the Asialaw Awards 2026. The nominations span jurisdiction-level, practice-area, and individual categories across the region. At the jurisdiction level, Tilleke & Gibbins has been shortlisted in three categories: Cambodia Firm of the Year Laos Firm of the Year Thailand Firm of the Year The firm has also been shortlisted for four regional practice awards: Aviation and Shipping Firm of the Year Corporate and M&A Firm of the Year Dispute Resolution Firm of the Year Technology and Telecommunications Firm of the Year Seven individual nominations recognize lawyers from the firm’s offices in Laos, Thailand, and Vietnam: Prisna Sungwanna, Laos Female Lawyer of the Year Pimvimol Vipamaneerut, Thailand Female Lawyer of the Year Tram Ngoc Bich Nguyen, Vietnam Female Lawyer of the Year John Frangos, Aviation and Shipping Lawyer of the Year, Dispute Resolution Lawyer of the Year Pongpalin Chantrapirom, Dispute Resolution Rising Star of the Year Chusert Supasitthumrong, Labour and Employment Lawyer of the Year The winners will be announced at an awards ceremony in Kuala Lumpur on November 5, 2026. For more information on the Asialaw Awards 2025 and to browse a full list of the nominees, please visit the Asialaw website.
June 10, 2026
Tilleke & Gibbins was again recognized as a top-tier intellectual property law firm in Southeast Asia in the 2026 edition of Managing Intellectual Property’s IP Stars rankings Firm Rankings In this year’s firm rankings, Tilleke & Gibbins secured the following positions: Cambodia General IP – Recommended (top tier awarded for this category) Indonesia Patent – Tier 2 Trademark – Tier 2 Thailand Patent – Tier 1 Trademark – Tier 1 Vietnam Patent – Tier 1 Trademark – Tier 1 Individual Rankings In addition to the firm rankings, 12 Tilleke & Gibbins lawyers were recognized individually as IP Stars: Cambodia David Mol – Rising Star Sokmean Chea – Rising Star Indonesia Rochmali Zultan – Rising Star Wongrat Ratanaprayul – Patent Star, Trademark Star Thailand Alan Adcock – Patent Star, Trademark Star Darani Vachanavuttivong – Patent Star, Trademark Star Kasama Sriwatanakul – Rising Star Sukontip Jitmongkolthong –Trademark Star Vietnam Linh Duy Mai – Rising Star Linh Thi Mai Nguyen – Trademark Star Loc Xuan Le – Patent Star, Trademark Star Trung Nguyen – Trademark Star The annual IP Stars rankings are based on extensive independent research, including client and peer feedback, market analysis, and recent case highlights. For more information and to browse the full rankings, please see the IP Stars website.
June 4, 2026
Tilleke & Gibbins has reinforced its position as one of Southeast Asia’s leading patent practices in the newly released IAM Patent 1000 2026, earning top-tier firm rankings in Indonesia, Thailand, and Vietnam, alongside 23 individual recognitions across the region. The firm achieved Gold rankings in Thailand and Vietnam and a Highly Recommended ranking in Indonesia—the highest tier available in the jurisdiction—highlighting the strength and consistency of its regional patent practice. This marks the firm’s 14th consecutive year in the top tier for Thailand, seventh consecutive year for Vietnam, and third straight year ranked among Indonesia’s leading firms. The firm’s strong regional performance is further reflected in the individual rankings, with the following Tilleke & Gibbins practitioners recognized for their expertise in patent law: Indonesia Irene Djalim Melinda Ambrizal Wongrat Ratanaprayul Thailand Alan Adcock Atthachai Homhuan Darani Vachanavuttivong Jakkrit Kuanpoth Napagate Triratana Nattriya Supmoon Nuttaphol Arammuang Peeyakorn Suparugbundit San Chaithiraphant Somboon Earterasarun Suebsiri Taweepon Sukontip Jitmongkolthong Wong Vorravitwattana Vietnam Dat Thanh Nguyen Giang Hoang Bach Hien Thi Thu Vu Hung Tuan Nguyen Linh Duy Mai Loc Xuan Le Thanh Phuong Vu The IAM Patent 1000 identifies the world’s leading patent firms and practitioners through extensive qualitative research based on feedback from clients, peers, and industry stakeholders. For more details, please see the IAM Patent 1000 rankings for Indonesia, Thailand, and Vietnam.

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