H. Lee, K. Kaneko, M. Ishikawa, and H. Miyakoda (Japan)
In this paper, we explain the approach for copyright protection of materials in the autonomous and collaborative vocabulary learning environment we established. A large amount of materials will be stored in the vocabulary learning environment. Hence, it is necessary for us to block registration of learning materials based on those created by others. Each of materials is a 5-second movie with a subtitle. We protect them by introducing digital watermarks into the pronunciation data.
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