Internet Engineering Task Force (IETF)                        P. Lemieux
Request for Comments: 7302                       Sandflow Consulting LLC
Category: Informational                                        July 2014
ISSN: 2070-1721


   Entertainment Identifier Registry (EIDR) URN Namespace Definition

Abstract

   Entertainment Identifier Registry (EIDR) Identifiers are used for the
   globally unique identification of motion picture and television
   content.  This document defines the formal Uniform Resource Name
   (URN) Namespace Identifier (NID) for EIDR Identifiers.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7302.

Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

1.  Introduction

   This document defines the formal Uniform Resource Name (URN)
   Namespace Identifier (NID) for EIDR Identifiers.

   EIDR Identifiers are centrally registered, globally unique
   identifiers for audiovisual works and their variants, primarily film
   and television.  A unique set of metadata parameters describing the
   associated work is bound to the EIDR Identifier at the time of
   registration.

   EIDR Identifiers are a special kind of DOI Names allocated by EIDR
   Association specifically for audiovisual works.  The Digital Object
   Identifier (DOI) system provides an infrastructure for persistent
   unique identification of objects of any type and is specified in
   [ISO26234].  A DOI name is the identifier that is permanently
   assigned to an object.  The use of DOI Names ensures persistence,
   global uniqueness, and an open resolution infrastructure.

   As a DOI Name, an EIDR Identifier has two components: a prefix
   assigned exclusively to EIDR Association by the DOI Registration
   Authority and a suffix defined by EIDR Association.  Currently, EIDR
   Identifiers use the prefix "10.5240", but additional prefixes might
   be introduced in the future.

   The following is an example of an EIDR Identifier in its canonical
   representation:

           10.5240/7791-8534-2C23-9030-8610-5

   where "10.5240" is the prefix and "7791-8534-2C23-9030-8610-5" is the
   suffix.  The canonical URN representation of the same EIDR Identifier
   is:

           urn:eidr:10.5240:7791-8534-2C23-9030-8610-5
   Note that ":" is used as separator between prefix and suffix since
   "/" is a URN reserved character.

   [EIDR-OVERVIEW] and [EIDR-INTRO] provide additional background
   information.

2.  Completed URN Namespace Definition Template

   The namespace definition according to the template in [RFC3406] is as
   follows:

   Namespace ID:

      eidr

   Registration Information:

      Version 1

      2014-03-03

   Declared registrant of the namespace:

      Name:

         Entertainment Identifier Registry Association

      Address:

         c/o Alliances Management
         544 Hillside Road
         Redwood City, CA 94062
         USA

      Contact:

         URL: http://eidr.org/contact/
         Email: info@eidr.org

   Declaration of syntactic structure:

      An EIDR Identifier is a special kind of DOI Name (see [ISO26234])
      and, as such, consists of two components: a prefix denoted EIDR-
      PREFIX and a suffix denoted EIDR-SUFFIX.  The URN representation
      URN-EIDR of an EIDR Identifier conforms to the syntax (expressed
      using [RFC5234]):

           URN-EIDR = "urn:eidr:" EIDR-NSS
           EIDR-NSS = EIDR-PREFIX ":" EIDR-SUFFIX
           EIDR-PREFIX = 1*EIDR-CHARS
           EIDR-SUFFIX = 1*EIDR-CHARS
           EIDR-CHARS = ALPHA / DIGIT / "-" / "." / "_"

      The only value of EIDR-PREFIX currently in use is "10.5240".
      Additional prefix values conforming to the EIDR-PREFIX syntax
      might be introduced by EIDR Association in the future.  In all
      cases, each of these additional prefix values will be associated
      with suffix values that conform to a subset of the EIDR-SUFFIX
      syntax.  These additional prefixes and their corresponding
      suffixes will be documented in future revisions to this
      registration.

      An implementation can process an EIDR-NSS with an unknown prefix
      as an opaque string per the "Rules of Lexical Equivalence" below,
      and resolve it as a generic DOI Name per the "Process for
      identifier resolution" below.

      When EIDR-PREFIX is equal to "10.5240", the syntax of EIDR-SUFFIX
      is further constrained according to the to RP2079-SUFFIX syntax
      specified in [SMPTERP2079]:

           RP2079-SUFFIX = 5(4HEXDIG "-") CHECK
           CHECK         = DIGIT / ALPHA

      where CHECK is the Mod 37,36 check character as specified in
      [ISO7064], computed over the 20 hexadecimal digits HEXDIG of
      RP2079-SUFFIX.

      EXAMPLE: urn:eidr:10.5240:7791-8534-2C23-9030-8610-5

   Relevant ancillary documentation:

      [ISO26234] specifies DOI Name syntax and registration.

      [SMPTERP2079] specifies the syntax of the EIDR Identifier with the
      prefix "10.5240".

   Identifier uniqueness considerations:

      An EIDR Identifier is a DOI Name.  The ISO 26324 Registration
      Authority ensures that DOI Name uniqueness; therefore, the
      URN-EIDR derived from an EIDR Identifier is guaranteed to be
      unique and never reassigned.

      Furthermore, an EIDR Identifier is associated with a single
      URN-EIDR.

   Identifier persistence considerations:

      An EIDR Identifier is a DOI Name.  The ISO 26324 Registration
      Authority ensures that a DOI Name remains valid indefinitely;
      therefore, the URN-EIDR derived from an EIDR Identifier remains
      valid indefinitely.

   Process of identifier assignment:

      EIDR Association registers each EIDR Identifier with the ISO 26324
      Registration Authority.

      Entities involved in the motion picture and television industry,
      either directly in the production of content or in its
      distribution and related services, are eligible to apply for
      registrant status.  Registrants pay an annual membership fee that
      depends on the size of the company.

   Process for identifier resolution:

      As a DOI Name, the resolution of the EIDR Identifier associated
      with an EIDR-NSS is handled by the ISO 26324 Registration
      Authority.

      The ISO 26324 Registration Authority operates a web service that
      allows the EIDR Identifier associated with an EIDR-NSS to be
      resolved by issuing an HTTP GET request to the following URI (see
      [RFC7231]):

               "http://doi.org/" EIDR-PREFIX "/" EIDR-SUFFIX

      If the EIDR Identifier exists, then an XML Schema instance
      document (see [XMLSchema]) containing metadata associated with the
      EIDR Identifier is returned; otherwise, the HTTP status code "404
      Not Found" is returned.

      EXAMPLE: http://doi.org/10.5240/7791-8534-2C23-9030-8610-5

      NOTE: At the time of this writing, this service of the ISO 26324
      Registration Authority is not available over TLS, and hence the
      confidentiality of queries is not protected.

      EIDR Association operates additional services specifically
      tailored to EIDR users (see [EIDR-SERVICES]).  These services
      include additional features, e.g., confidential lookup using TLS
      and the ability to register EIDR Identifiers.

   Rules for Lexical Equivalence:

      Lexical equivalence of EIDR-URN is defined by case-insensitive
      string match.

   Conformance with URN Syntax:

      As specified above, the syntax of EIDR-URN is a subset of the URN
      syntax specified in [RFC2141].

   Validation mechanism:

      The validity of an EIDR-NSS can only be guaranteed by completing
      the resolution process.

      For EIDR-NSS with an EIDR-PREFIX equal to "10.5240", the CHECK
      value can be used for integrity checking, as specified above.

   Scope:

      EIDR Identifiers are centrally registered, globally unique
      identifiers for use with audiovisual works worldwide.

3.  Namespace Considerations

   EIDR Identifiers are intended for use in Internet applications, where
   URNs are routinely used to identify audiovisual resources.  There is
   no direct mapping from EIDR Identifiers to existing URN namespaces.

4.  Community Considerations

   The primary registrants of EIDR Identifiers are producers and
   distributors of audiovisual works, metadata aggregators, and
   audiovisual archives.  Any bona fide member of the ecosystem can
   become an EIDR member and register any work.  EIDR Identifiers can be
   used by anyone to unambiguously identify an audiovisual asset and
   retrieve underlying metadata.  The primary benefits of their use are
   associated with works in wide distribution, management of long or
   complex distribution chains, and aggregation of information from
   multiple sources.

5.  IANA Considerations

   IANA has registered the Formal URN Namespace 'eidr' in the "Uniform
   Resource Names (URN) Namespaces" registry, using the registration
   template in Section 2 of this document.

6.  Security Considerations

   This document specifies the syntax of the EIDR-URN namespace and
   makes no security representations.  Furthermore, the details of
   assignment and resolution processes are defined external to this
   document by EIDR Association and the ISO 26324 Registration
   Authority, and thus are outside the scope of this document.  Note,
   however, that failure to conform to the syntactic and lexical
   equivalence rules in this specification when using an EIDR Identifier
   as a criteria for accessing restricted resources can result in
   granting unauthorized access to these resources.

7.  References

7.1.  Normative References

   [ISO26234] International Organization for Standardization,
              "Information and documentation - Digital object identifier
              system", ISO Standard 26324, 2012.

   [ISO7064]  International Organization for Standardization,
              "Information technology - Security techniques - Check
              character systems", ISO Standard 7064, 2003.

   [RFC2141]  Moats, R., "URN Syntax", RFC 2141, May 1997.

   [RFC5234]  Crocker, D. and P. Overell, "Augmented BNF for Syntax
              Specifications: ABNF", STD 68, RFC 5234, January 2008.

   [SMPTERP2079]
              Society of Motion Picture and Television Engineers,
              "Digital Object Identifier (DOI) Name and Entertainment ID
              Registry (EIDR) Identifier Representations", SMPTE RP
              2079, 2014.

7.2.  Informative References

   [EIDR-INTRO]
              Entertainment Identifier Registry Association, "EIDR: ID
              Format Ver. 1.1", August 2013,
              <http://eidr.org/documents/EIDR_ID_Format_v1.1.pdf>.

   [EIDR-OVERVIEW]
              Entertainment Identifier Registry Association, "EIDR
              Overview", November 2013, <http://eidr.org/
              documents/2013-11-01_EIDR_Overview_FINAL.pdf>.

   [EIDR-SERVICES]
              Entertainment Identifier Registry Association, "EIDR
              System Version 2.0: Registry User's Guide", August 2013,
              <http://eidr.org/documents/
              EIDR_2.0_Registry_User_Guide.pdf>.

   [RFC3406]  Daigle, L., van Gulik, D., Iannella, R., and P. Faltstrom,
              "Uniform Resource Names (URN) Namespace Definition
              Mechanisms", BCP 66, RFC 3406, October 2002.

   [RFC7231]  Fielding, R. and J. Reschke, "Hypertext Transfer Protocol
              (HTTP/1.1): Semantics and Content", RFC 7231, June 2014.

   [XMLSchema]
              Holstege, M. and A. Vedamuthu, "W3C XML Schema Definition
              Language (XSD): Component Designators", W3C Candidate
              Recommendation CR-xmlschema-ref-20100119, January 2010,
              <http://www.w3.org/TR/2010/CR-xmlschema-ref-20100119>.

Author's Address

   Pierre-Anthony Lemieux
   Sandflow Consulting LLC

   EMail: pal@sandflow.com