DRM_Level is a license attribute that the Windows Media Format SDK sets when it creates a local license for files protected with DRM version 1. It contains the security level that the calling application must have to access the content in the file. The default value is 150.
An application's DRM security level is determined by the particular wmstubdrm library that it links to at compile time. For more information on these security levels, see Obtaining the Required DRM Library. Use IWMHeaderInfo::SetAttribute to set this property when protecting ASF files with DRM version 1.