SDK 是软件开发者在开发网络硬盘录像机、网络视频服务器、网络摄像机、网络球机和智能设备等产品监控联网应用时的开发套件。(SDK is a development kit for software developers in developing networked video applications such as network hard disk recorders, network video servers, network cameras, network ball machines, and smart devices.)