1. According to the writer, it is not necessary for a company to register a trademark.
对
错
2. A trademark may be regarded as a protection for a brand name.
对
错
3. The trademark symbols TM and ? can be exchanged in a brand.
对
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4. Legal protection on a brand comes into force only after registration.
对
错
5. A company can freely use other companies'brands.
对
错
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