Trademark is one of the Intellectual Property parts that has very important role in national and international trade since the enterpreneurs and consumers may easily choose the best quality products. Many trademark disputes occured in Indonesia were caused by the parties who registered their trademark in bad faith. Bad faith is the intention of the applicant of mark to imitate or infringe the well known trademark in order to get a huge benefit in short time. One of the trademark disputes being an object of the research is the cancellation lawsuit of “KEEN” trademark filed by KEEN, INC., a US Corporation as the owner of “KEEN” well known trademark, against Mr. Arif, Indonesian citizen who has previously registered “KEEN” and “KEEN+Logo” trademarks in Indonesia which having basic and/or entire similarities to the “KEEN” trademark of Plaintiff for similar goods. The Judgments provided by the Panel of Judges in the Central Jakarta District Court and in the Judicial Review which accepting the Demurrer/Exception of Defendant based on consideration that the Plaintiff’s lawsuit has already expired without considering the evidences provided by Plaintiff showing the well known of “KEEN” trademark indicates that there is no any guarantee or legal certainty for the owner of well known trademark who intended to do an investment in Indonesia.