MPEG asks for MIME review for the MPEG21 file format

[Stephan Wenger]

Folks,
MPEG (ISO/IEC JTC1 SC29) sent us an liaison statement asking us to  
review their draft for a MIME registration of the MPEG-21 file  
format.  I know nothing about the subject matter, but hope some of  
you could give them a hand.  Please direct any technical questions to  
Save Singer of Apple, singer at apple.com.  Below, please find what I  
believe they want to register.  Their full liaison statement (in a  
bunch of word files) can be found here: https://datatracker.ietf.org/ 
public/liaisons.cgi, look for ISO/IEC JTC1 SC29, May 2007
Best regards,
Stephan

> MIME media type name: application
> MIME subtype name: mp21
> Required parameters: none
> Optional parameters: none
> Encoding considerations: base64 IS generally preferred; files are  
> binary and should be transmitted without CR/LF conversion, 7-bit  
> stripping, etc.
> Security considerations: It is possible to inject non-compliant  
> MPEG streams (Audio, Video, and Systems) in the MP21 file to  
> overload the receiver/decoder's buffers. This might compromise the  
> functionality of the receiver or even crash it.
> An MP21 file supports the storage of stream types, including  
> commands that are executed on the terminal such as Digital Item  
> Methods based on ECMASCRIPT for which also bindings to Java(TM) and  
> C++ exists. It is possible to use one or more of the above in a  
> manner non-compliant to MPEG to crash the receiver or temporarily  
> make it unavailable.
> Authentication mechanisms can be used to validate of the sender and  
> the data to prevent security problems due to non-compliant  
> malignant MP21 files.
> Interoperability considerations: A number of interoperating  
> implementations exist within the ISO/IEC 21000 community, and that  
> community has reference software for reading and writing the file  
> format.
> Published specification: ISO/IEC 21000-9:2005
> Applications which use this media type: Multimedia
> Additional information:
> Magic number(s): none
>
> File extension(s): mp21 and mpg21 are both declared at http:// 
> pitch.nist.gov/nics/ and http://filext.com/
>
> Macintosh File Type Code(s): mp21 is registered with Apple.
>
> Person & email address to contact for further information: David  
> Singer, singer at apple.com
> Intended usage: COMMON
> Author/Change controller: David Singer, ISO/IEC 21000 file format  
> chair
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