<![CDATA[Trademark disputes involving similarity in principle may harm registered trademark holders, particularly when a trademark is registered by imitating or exploiting the reputation of another party’s trademark. This study aims to analyze the application of the good faith principle in trademark cancellation based on similarity in principle and to examine efforts to strengthen the good faith principle in providing legal protection for registered trademark holders in Indonesia. This study employs a normative juridical method using statutory, conceptual, and case approaches. Legal materials are analyzed qualitatively, focusing on Law Number 20 of 2016 concerning Trademarks and Geographical Indications, as well as the principles of good faith and similarity in principle. The results indicate that the good faith principle plays an important role in assessing the validity of trademark registration, particularly where similarity in principle is accompanied by indications of imitation or exploitation of another trademark’s reputation. Strengthening this principle may be achieved through more thorough substantive examination, assessment of dominant elements and the overall impression of trademarks, identification of indications of imitation, and optimization of the trademark cancellation mechanism. Therefore, consistent application of the good faith principle can strengthen legal certainty and effective protection for registered trademark holders. Keywords: Good Faith; Trademark; Legal Protection; Registered Trademark Holder; Similarity In Principle.]]>
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