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In this digital era, the ubiquitous network environment has promoted the rapid delivery of digital multimedia data. Users are eager to enjoy the convenience and advantages that networks have provided. Meanwhile, users are eager to share various media information in a rather cheap way without awareness of possibly violating copyrights. In view of these, digital watermarking technologies have been recognized as a helpful way in dealing with the copyright protection problem in the past decade. Although digital watermarking still faces some challenging difficulties for practical uses, there are no other techniques that are ready to substitute it....