There are 2 file types use the .MP21 file extension:
1. AXMEDIS MPEG-21 Object
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.
Updated: February 4, 2009
2. MPEG-21 Multimedia File
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.
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Updated: April 2, 2008