According to Article 8 of the Trademark Law:

"Any mark that can distinguish the goods of natural persons, legal persons or other organizations from the goods of others, including words, graphics, letters, numbers, three-dimensional marks, color combinations and sounds, and the combination of the above elements, can apply for registration as a trademark."

To register a sound as a trademark, the following important conditions must be met:

1. Special sounds shall not be registered. For example, voices with the same or similar melody as the national anthem and military songs may not apply for registration as trademarks, and at the same time, voices may not contain words such as ethnic discrimination.

2. The prior rights of others shall not be harmed.

3. Universal and functional voices are not allowed to be registered. For example, "Wedding March" cannot be registered as a sound trademark of the wedding service industry.

4. It must be significant. On May 4th, 214, Tencent applied for the registration of QQ message prompt tone "Didi Didi Didi Didi" as a trademark, but was rejected by the Trademark Office on the grounds that "the applied trademark is composed of simple and ordinary tones or melodies, which lacks significance in the designated use items". Subsequently, Tencent filed an application for reexamination with the Trademark Review and Adjudication Board, and submitted relevant supporting materials, which was still rejected by the Trademark Review and Adjudication Board on the grounds that it was "difficult to distinguish service sources".

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