This rights encoded with WBXML, others are enconded with XML. The MIME type for rights objects in textual XML representation MUST be application/vnd.oma.drm.rights+xml. The MIME type for WBXML encoded rights objects MUST be application/vnd.oma.drm.rights+wbxml. The file extension for textual rights objects MUST be .dr. The file extension for WBXML encoded rights objects MUST be .drc.