Bad-Faith Trademark Filings in Korea: Prevention and Remedies

Korea applies a first-to-file trademark system. A foreign registration or earlier overseas use does not automatically defeat an earlier Korean application. A brand owner should therefore file its principal word mark, logo, and intended Hangul transliteration before disclosing the brand to Korean distributors, manufacturers, marketing partners, or consumers.

When an unauthorized Korean application has already been filed, the available procedure depends on whether the application is under examination, published for opposition, or registered. Evidence should be secured before the applicant is contacted.

Trademark Act grounds

Article 34 of the Korean Trademark Act contains several grounds relevant to an unauthorized filing. A mark identical or similar to another person's mark recognized by consumers in Korea or abroad may be refused when it was filed for an improper purpose, including obtaining an unfair benefit or causing harm.

Article 34(1)(20) applies when an applicant learned through partnership, employment, a contract, business dealings, or another relationship that another person used or intended to use a mark, and then applied for an identical or similar mark for identical or similar goods or services. The provision is directly relevant to filings by distributors, importers, agents, manufacturers, former employees, and other commercial counterparties.

Depending on the facts, additional grounds may concern well-known marks, misleading affiliation, famous names, or earlier rights. The Unfair Competition Prevention and Trade Secret Protection Act may provide separate relief for misuse of a well-known business identifier or other conduct falling within that Act.

Evidence required

The record should be organized around the Korean filing date. Relevant evidence includes:

• foreign trademark applications and registrations;
• dated records establishing creation and ownership of the brand;
• sales, advertising, press coverage, awards, website traffic, and market-recognition evidence predating the Korean filing;
• distribution, manufacturing, agency, employment, or marketing agreements;
• emails, messages, presentations, samples, and product files supplied to the applicant;
• invoices, purchase orders, and shipping records showing the commercial relationship;
• demands for payment or transfer, blocking conduct, or enforcement threats; and
• other applications filed by the same applicant that may show a repeated course of conduct.

A reputation-based claim and a relationship-based claim require different proof. The former depends substantially on recognition of the mark before the filing date. The latter depends on the applicant's knowledge, the parties' relationship, the goods or services involved, and the circumstances of the application.

Procedure before publication

A third party may submit information to MOIP identifying a refusal ground and supporting evidence while the application is under examination. The legitimate owner should also file its own Korean application promptly. The unauthorized earlier application may initially block or delay that application, but the owner's filing preserves its position against later applicants and establishes the requested scope of protection.

Opposition after publication

For applications published on or after July 22, 2025, an opposition must be filed within 30 days after publication. The amendment reducing the former two-month period applies by reference to the publication date. The opposition deadline is statutory and should be treated as non-extendable.

The grounds and evidence may be supplemented during the period allowed under Article 61 after the opposition period, subject to the current extension rules. The initial opposition must nevertheless identify the challenged application and be filed within 30 days.

Invalidation and non-use cancellation

After registration, an interested party may petition the Intellectual Property Trial and Appeal Board to invalidate the registration on the applicable Article 34 ground. The petition should identify the statutory ground, relevant designated goods or services, filing-date evidence, and requested scope of invalidation.

A registration that has not been used in Korea for three consecutive years may also be subject to a non-use cancellation trial. Non-use cancellation addresses use of the registered mark and does not replace an invalidation claim directed to the applicant's conduct at filing. The procedures may serve different objectives and have different evidentiary requirements.

Related enforcement measures

The facts may support an unfair-competition action, civil injunction, marketplace or platform procedure, customs recordation, or criminal or administrative report. Each measure requires its own statutory basis and evidence. A warning letter should be sent only after evidence has been preserved, procedural deadlines have been docketed, and related applications and assets have been investigated.

Related Korean brand assets

The investigation should extend beyond the identified application to:

• Hangul transliterations, abbreviations, and phonetic variants;
• logos, product names, slogans, and packaging designs;
• company names and trade names;
• Korean domain names and social-media identifiers;
• e-commerce storefronts and marketplace brand registries; and
• customs recordation and evidence needed for local enforcement.

Defensive applications should correspond to marks that the owner uses or genuinely intends to use. Unrelated specifications increase cost and may later create non-use exposure.

Distributor and partner agreements

A Korean distribution, agency, manufacturing, or marketing agreement should state that:

• the brand rights and associated goodwill belong to the designated owner;
• the partner may not apply for or assist another person to apply for a trademark, design, domain name, company name, storefront, or social-media identifier incorporating the brand;
• an application made in breach must be assigned or withdrawn at the partner's cost;
• authorized use ends or changes as stated on termination;
• the partner must preserve and provide evidence needed for registration or enforcement; and
• locally developed Hangul versions and other agreed brand variants are covered by the ownership and assignment provisions.

The intended brand owner should ordinarily be the applicant of record. Silence in an agreement does not necessarily prevent reliance on Article 34(1)(20), but an express ownership and no-filing clause provides clearer evidence and contractual remedies.

Assignment and settlement

An assignment may resolve an urgent commercial obstacle more quickly than an opposition or trial, but the settlement scope must be evaluated against the legal case and all related assets. A payment for one application does not transfer a domain name, social account, storefront, logo filing, or related registration unless the agreement covers it.

A transfer agreement should identify the application or registration, related brand assets, withdrawal of enforcement demands, evidence delivery, recordal cooperation, costs, representations concerning third-party interests, and payment conditions tied to completed transfer steps.

Effect of a foreign registration

A foreign trademark registration is relevant evidence of ownership, use, and the applicant's knowledge, but it does not automatically cancel a Korean application. The owner must establish a refusal, opposition, invalidation, cancellation, contractual, or unfair-competition ground available under Korean law.

This article provides general information and is not legal advice for a particular dispute.

Official references

• Current Korean Trademark Act
• Korean Supreme Court decision applying Article 34(1)(20)
• MOIP notice on the 30-day opposition period
• MOIP IP protection FAQ

Related South Korea IP guidance

• Trademark Registration in Korea: Requirements, Fees, and Timing
• Trademark Clearance Searches in Korea for Foreign Brand Owners
• Korean Customs Recordation and Anti-Counterfeiting Enforcement

Legal and editorial review: July 16, 2026. Korea’s current IP authority is the Ministry of Intellectual Property (MOIP), formerly KIPO.