开发drm(数据版权管理)必备的sdk,网上很少有下载,如果从微软网站下载,windows需要经过正版认证.-Development drm (data rights management) required sdk, few online download from the Microsoft website, windows genuine need to go through certification.

DRM 的SDK,即对wma文件进行加密的sdk安装文件-windows media rights manager sdk