With the development of computer network and multimedia technology, copyright protection and authentication become more and more urgent.
随着多媒体技术和网络技术的飞速发展和广泛应用，版权保护和安全认证成了迫切需要的问题。
With the development of computer network and multimedia technology, copyright protection and authentication become more and more urgent.
随着多媒体技术和网络技术的飞速发展和广泛应用，版权保护和安全认证成了迫切需要的问题。
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