Whether a trademark is registered or not and whether it is necessary to apply for copyright registration again depends on the type of trademark. If it's just a few words, you don't need to apply for copyright (it's just a few words that are difficult to apply for copyright). But if the trademark is a graphic and you don't want others to use it in other industries, you can apply for copyright. The advantage of applying for copyright is that no matter what industry, as long as you apply for copyright, it is protected by law and cannot be used or modified by others without authorization. You must agree to use it. Then a trademark is different (unless it is a well-known trademark). If a trademark is registered in only one industry, it is still not protected in other industries.
Legal objectivity:
the trademark law of the people's republic of china
Article 44
Registered trademarks violate this law.
the trademark law of the people's republic of china
Article 4
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the trademark law of the people's republic of china
Article 10
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the trademark law of the people's republic of china
Article 11
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the trademark law of the people's republic of china
Article 12
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the trademark law of the people's republic of china
Article 19
Where the registration is obtained by deception or other improper means as stipulated in the fourth paragraph, the Trademark Office shall declare the registered trademark invalid;
Other units or individuals may request the Trademark Review and Adjudication Board to declare the registered trademark invalid.
the trademark law of the people's republic of china
Article 49
Where a trademark registrant changes the registered trademark, the registrant's name, address or other registered items by himself in the process of using the registered trademark, the local administrative department for industry and commerce shall order it to make corrections within a time limit;
If it fails to make corrections within the time limit, its registered trademark shall be revoked by the Trademark Office. Any unit or individual may apply to the Trademark Office for the cancellation of a registered trademark if it becomes the common name of a commodity approved for use or if it is not used for three consecutive years without justifiable reasons. The Trademark Office shall make a decision within nine months from the date of receiving the application. There are special circumstances that need to be extended, which can be extended for three months with the approval of the administrative department for industry and commerce of the State Council.