You are using an outdated browser and your browsing experience will not be optimal. Please update to the latest version of Microsoft Edge, Google Chrome or Mozilla Firefox. Install Microsoft Edge

August 21, 2025

Passing Off in Thailand: Trademark Protection without Proof of Registrability

Subscribe to Updates

Although the “passing off” principle has sometimes faced criticism for potentially broadening trademark protection—particularly in cases involving unregistered or unconventional marks like shapes, scents, or sounds—it serves an essential purpose. It safeguards the rights of business owners and shields consumers from deception, ensuring fair competition and reflecting the realities of modern commerce.

What is passing off, and why is registrability not required?

The passing-off principle is a legal concept rooted in English law, aimed at preventing a person from falsely representing or using a mark similar to another’s in a way that causes consumers to mistakenly believe the goods or services come from the same source.

Under Thai law, the passing-off principle is provided under Section 46 of the Thai Trademark Act, which states:

No person shall be entitled to bring legal proceedings to prevent or to recover damages for the infringement of an unregistered trademark.

The provisions of this Section shall not affect the right of the owner of an unregistered trademark to bring legal proceedings against any person for passing off goods as those of the owner of the trademark.

The passing-off principle can be interpreted as a practical legal concept. It does not require proof that the mark is registrable or meets the registrability criteria under trademark law. It is sufficient to show that the mark has established goodwill and that the other party’s use of a similar mark is likely to confuse consumers, making it a straightforward and effective tool for protecting brand assets.

Requiring a claimant to prove that an unregistered mark could have been registered would undermine the very function of passing off. The doctrine was conceived precisely to fill the gaps left by the registration system. Imposing registrability criteria would nullify its function and leave many commercially valuable identifiers unprotected.

If the doctrine of passing off were not rigorously enforced to safeguard a proprietor’s rights, a third party could unlawfully exploit the proprietor’s goodwill and reputation. Such bad-faith conduct would primarily harm consumers, who would be misled into believing that the infringer’s goods originated from, or were otherwise affiliated with, the rightful owner. Inevitably, the quality of those infringing goods would fail to measure up to the high standards consistently maintained by the legitimate proprietor.

Moreover, many nontraditional identifiers, such as distinctive store layouts, packaging designs, or color schemes, may not qualify as registrable marks under statutory law. However, these identifiers often acquire significant consumer recognition and goodwill. Excluding them from protection would ignore the commercial realities of how consumers identify and differentiate products.

Even where a product’s configuration represents its natural form or is dictated by functional necessity, that shape may nonetheless be eligible for trademark protection if the proprietor has expended substantial resources to promote the design and, as a result, the consuming public has come to recognize the configuration as identifying the source of the goods—that is, the shape has acquired distinctiveness, or secondary meaning.

Judicial decisions supporting the passing-off principle

Thailand’s Supreme Court established in Decision No. 343/2503 that if a trademark is not registered but has been used continuously and has gained popularity and recognition among consumers, it can be protected under the passing-off principle, without the need to prove it meets registrability requirements under the Trademark Act.

Various judgments of the Central Intellectual Property and International Trade Court have also held that the passing-off principle can be applied to unregistered marks without the need to prove that the mark is considered registrable under Thai law. This emphasizes that protection under the passing-off principle aims to prevent consumer deception and maintain market integrity, providing a secure legal framework for your business interests.

Conclusion

Strictly interpreting the passing-off principle by adhering to registration criteria may deprive longtime business owners who have used their marks but have not registered them of rightful protection, despite their legitimate interest in safeguarding their reputation and consumer trust. Nontraditional identifiers like trade dress, including store layouts, packaging designs, and color schemes, should be recognized as protectable when they have acquired distinctiveness or serve the function of a trademark. Businesses that have invested time and resources in building goodwill deserve legal protection even if their marks are not registered or not qualified for registration by law. Denying such protection would undermine both commercial fairness and consumer confidence, especially when the law does not require registration for enforcement under the passing-off principle.

Related Professionals

Practices

Intellectual Property

Location

RELATED INSIGHTS​ 

April 21, 2026
Vietnam continues to refine its intellectual property framework to align with the 2025 amendments to the Law on Intellectual Property (IP Law). On March 31, 2026, the government issued Decree 100/2026/ND-CP (Decree 100), which substantially amends Decree 65/2023/ND-CP detailing the implementation of the IP Law (Decree 65). On the same day, the Ministry of Science and Technology released Circular 10/2026/TT-BKHCN (Circular 10), providing detailed procedural guidance and new forms. Both instruments took effect on April 1, 2026, along with the amended IP Law. While the updates touch on every IP right, trademark owners and brand strategists will find several practical and forward-looking changes that directly affect filing strategy, examination timelines, portfolio management, and enforcement readiness. 1. Fast-Track Substantive Examination for Eligible Applications One of the most business-friendly innovations is the new fast-track substantive examination pathway for applications meeting specified eligibility criteria. Successful fast-track applications enjoy a shortened substantive examination period of three months. This offers a significant competitive edge for tech-driven or regulated-sector brands. If the mark is identical or similar to a mark in another person’s trademark application with an earlier filing date in the case of a priority application that has not yet been processed, the fast-track process will return to the ordinary process. However, the law does not touch on cases where marks under fast-track examination face office action due to other reasons (i.e. lack of distinctiveness, confusingly similar to others’ copyright, trade name, industrial design, etc.) 2. AI-Generated Trademarks Receive Clear Protection Pathway Decree 100 explicitly addresses the use of artificial intelligence (AI) in IP creation, amending Article 10a of Decree 65 to confirm that trademarks created with AI systems are fully protectable, provided they meet the standard requirements of registration. Trademarks face no additional “human authorship” hurdle (unlike patents or industrial designs). Brand owners
Read More
April 20, 2026
Myanmar’s industrial design registration regime has been steadily gaining momentum since the country officially began accepting applications under the Industrial Design Law of 2019. The Industrial Design Division of Myanmar’s Intellectual Property Department (IPD) has actively advanced examination and registration procedures, and as of March 2026, approximately 300 industrial design applications have been published in the IPD’s publicly accessible database—a meaningful milestone in the development of Myanmar’s emerging intellectual property framework. This figure reflects only published applications; additional filings remain pending and will be published after the conclusion of ongoing examination. Filing Requirements in Practice Compliance with a defined set of mandatory requirements is the foundation for filing a valid design application. These mandatory particulars must be provided at the time of filing in order to establish a filing date. These include the applicant’s and creator’s identifying details, a notarized appointment of representative form, the Locarno Classification of the associated product, and a set of graphic representations of the design across multiple standard views. Applicants must also provide a written description of the design and, where applicable, information relating to any priority claim or request for deferred publication. Filing fees are payable at the time of submission. Beyond these core requirements, applicants typically need to provide supplementary documentation, either at the time of filing or in response to a formality examination. This may include evidence of the applicant’s legal entitlement to the design—particularly where the applicant and creator are different parties—as well as supporting corporate and authorization documents. Where priority rights are claimed, the relevant documents must generally be submitted within three months of the Myanmar filing date, with certified English translations required for any non-English priority applications. The supplementary requirements may vary depending on the nature of the application and the examiner’s requests during the formality examination process.
Read More
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
Read More
March 31, 2026
Vietnam’s most recent amendment of the Law on Intellectual Property (amended IP Law), passed by the National Assembly on December 10, 2025, and effective from April 1, 2026, represents one of the most significant updates to the IP Law in recent years. This amendment modernizes the IP framework, moving a step closer to international standards, while addressing the realities of Vietnam’s booming digital economy, e-commerce growth, and increasing foreign investment, which is crucial for Vietnam’s objective of complete economic transformation. For trademark practitioners, brand owners, and businesses, the changes are largely positive, as they promise faster processes, stronger enforcement tools—especially for online actions—and better commercialization options. However, they also introduce stricter requirements and a need for proactive preparation. Below are some of the most noteworthy changes in the amended IP Law related to trademarks. Significantly Shortened Timelines and Introduction of Fast-Track Examination The statutory timelines under the amended IP Law have been notably reduced: Substantive examination for trademarks is shortened from 9 months to 5 months (from the publication date). The publication period is shortened from 2 months to 1 month. A new fast-track mechanism allows substantive examination in as little as 3 months for qualifying applications (e.g., marks in actual use, facing infringement threats, or meeting government-specified criteria; details to be clarified in implementing regulations). The opposition period is shortened from 5 months to 3 months from publication. This is arguably the most welcome change. Vietnam’s IP Office has long faced criticism for lengthy backlogs, often stretching the trademark registration process to 18–24 months or more. The new timelines bring Vietnam closer to efficient systems. The fast-track option is particularly smart for high-value or urgent cases such as counterfeit threats on e-commerce platforms. However, careful preparation is mandatory for flawless applications from the start to maximize fast-track eligibility.
Read More