.MP21 File Extension

Media file saved in the AXMEDIS content distribution format; may contain multiple types of media, such as images, video, and audio data; may also include metadata, and DRM copy-protection information.

MP21 files are similar to .AXM files, but they used a more compressed format and can be opened more quickly. MP21 files can be created with AXMEDIS Editor and opened with AXMEDIS Player.

Media storage format developed by the Moving Picture Experts Group (MPEG); based on a "meta-box" format that contains audio or video data referred to as the "Digital Item;" also includes metadata that describes the media.

MPEG-21 files typically use the .M21 file extension.