DRM風險:
http://www.easydigi.net/News/00101/200608/622.shtml
DRM開發步驟:
http://cn.drm-x.com/cnxdrm-help/115-%E7%AC%AC%E4%B8%80%E6%AD%A5_%E6%B3%A8%E5%86%8CDRM-X%E8%B4%A6%E6%88%B7.aspx
