Trademark infringement refers to the use of the same or similar trademarks by others without the authorization of the trademark registrant, which may lead to confusion or misunderstanding among consumers. Anyone, including individuals or enterprises without registered trademarks, can complain about trademark infringement or take legal action.
Non-trademark registrants may need to provide evidence to prove the use and infringement of trademarks when complaining about trademark infringement. These evidences can include market research related to trademarks, evidential materials, time and place of trademark use, etc. In addition, the legal systems of some countries or regions may also provide some protective measures, such as the use of unregistered trademarks and unfair competition.
However, when a trademark registrant complains about trademark infringement, it is usually easier to get legal protection and support, because a trademark registrant has a formal certificate of trademark rights and interests, which can more conveniently defend rights and pursue the infringer's responsibility.
To sum up, although not trademark registrants can complain about trademark infringement, trademark registrants usually have stronger legal status and rights protection ability in the process of rights protection.
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