Media Type Registrations for Downloadable Sounds for Musical Instrument Digital Interface (MIDI)
RFC 4613

 
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Type RFC - Informational (September 2006; No errata)
Was draft-westerlund-mime-dls (individual in gen area)
Last updated 2013-03-02
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IESG state RFC 4613 (Informational)
Telechat date
Responsible AD Ted Hardie
Send notices to Per.Frojdh@ericsson.com, magnus.westerlund@ericsson.com

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Network Working Group                                          P. Frojdh
Request for Comments: 4613                                   U. Lindgren
Category: Informational                                    M. Westerlund
                                                                Ericsson
                                                          September 2006

           Media Type Registrations for Downloadable Sounds
            for Musical Instrument Digital Interface (MIDI)

Status of This Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2006).

Abstract

   This document serves to register a media type for Downloadable
   Sounds.

Table of Contents

   1. Introduction ....................................................1
   2. Security Considerations .........................................2
   3. IANA Considerations .............................................2
      3.1. Media Type for Downloadable Sounds .........................3
   4. References ......................................................5
      4.1. Normative References .......................................5
      4.2. Informative References .....................................5

1.  Introduction

   The present document seeks to register a media type for Downloadable
   Sounds (DLSes).  The DLS format is used to define instruments for
   widely used wavetable synthesizers associated with the standards
   [DLS1, DLS2, MDLS].  DLSes and their associated standards are
   maintained and defined by two organizations, the Musical Instrument
   Digital Interface (MIDI) Manufacturers Association (MMA) and the
   Association of the Musical Electronics Industry (AMEI).

   The media type defined here is needed to identify DLS files correctly
   when they are served over HTTP, included in multi-part documents, or
   used in other places where media types are used.

Frojdh, et al.               Informational                      [Page 1]
RFC 4613           Media Type Registrations for MIDI      September 2006

2.  Security Considerations

   The DLS format may contain audio, displayable text data, and modeling
   parameters (a.k.a. articulation parameters).  In addition, the DLS
   format contains a so-called conditional chunk that is 'active' in the
   sense that it affects the execution of a DLS file parser.  However,
   the DLS format does not currently define any scripting mechanism.

   Clearly, it is possible to author malicious files that, for example,
   contain large amounts of data always blocked by a conditional
   statement; i.e., no synthesizer loads the instruments.

   However, for DLS, clients can and usually do protect themselves
   against these kinds of attacks.  A key point is that conditional
   chunks are optional, that is, a parser does not have to execute a
   conditional chunk.  However, if a parser evaluates a conditional
   chunk, it is still possible to parse its content and draw to a
   conclusion as to whether it is usable for a particular synthesizer
   engine.

   Note that selected metadata fields may include information partly
   intended to protect the media against unauthorized use or
   distribution.  In this case, the intention is that alteration or
   removal of the data in the field would be treated as an offense under
   national agreements based on World Intellectual Property Organization
   (WIPO) treaties.

   DLS have an extensible structure, making it theoretically possible to
   define metadata fields or media formats in the future that could be
   used to induce particular actions of the recipient, and thus that
   would present additional security risks.  However, this type of
   capability is currently not supported in the referenced
   specifications.

   There is no current provision in the DLS standard for encryption,
   signing, or authentication within the file formats.

3.  IANA Considerations

   The IANA has registered the media type audio/dls, as specified in
   Section 3.1.  The registration uses the template present in
   [RFC4288].

Frojdh, et al.               Informational                      [Page 2]
RFC 4613           Media Type Registrations for MIDI      September 2006

3.1.  Media Type for Downloadable Sounds

   Type name:                         audio

   Subtype name:                      dls

   Required parameters:               None

   Optional parameters:               'dls-type'
                                      A comma-separated list of the
                                      dls types (one or more) that the
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