Among the many types of multimedia products, the transmission and copy of document images are easier, but in many cases often document images have higher value than natural images, sound, video, etc.
在众多类型的多媒体产品中，文档图像在许多情况下往往比自然图像、声音、视频等具有更高的价值，但是又更加容易被传播和拷贝。
New networks must also meet the growing demand for faster transmission speeds, especially for sound and video applications.
新型网络必须满足快速传输速率的要求，特别在声音和录像应用上。
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