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数字影音播放能力已经从便携式媒体播放器和个人电脑发展到其它消费者电子设备,如:便携式导航装置(PND)和手机。数字影音文件的一个缺点就是:播放机构限于最初用于下载媒体的装置。例如,一个用户从他的移动服务供应商的终端购买了一首歌
Digital video playback capabilities have evolved from portable media players and personal computers to other consumer electronic devices such as portable navigation devices (PNDs) and cell phones. A disadvantage of digital video files is that the playback mechanism is limited to the device originally used to download the media. For example, a user purchased a song from the terminal of his mobile service provider