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This paper provides a algorithm of digital watermarking in MP4 Music. Cooperating the characteristic of audio and using the energetic variation for three next sections to seek for the new appropriate method. The action of embedding digital watermark will not affect the quality of audio. Furthermore, this embedding will not only provides enough robustness to bear several kinds of attacks, including MP4 compression, low-pass filter, normalization, D/A converter, and clipped signal but also can keep the completeness of digital watermark.