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+Network Working Group G. Good
+Request for Comments: 2849 iPlanet e-commerce Solutions
+Category: Standards Track June 2000
+
+
+ The LDAP Data Interchange Format (LDIF) - Technical Specification
+
+Status of this Memo
+
+ This document specifies an Internet standards track protocol for the
+ Internet community, and requests discussion and suggestions for
+ improvements. Please refer to the current edition of the "Internet
+ Official Protocol Standards" (STD 1) for the standardization state
+ and status of this protocol. Distribution of this memo is unlimited.
+
+Copyright Notice
+
+ Copyright (C) The Internet Society (2000). All Rights Reserved.
+
+Abstract
+
+ This document describes a file format suitable for describing
+ directory information or modifications made to directory information.
+ The file format, known as LDIF, for LDAP Data Interchange Format, is
+ typically used to import and export directory information between
+ LDAP-based directory servers, or to describe a set of changes which
+ are to be applied to a directory.
+
+Background and Intended Usage
+
+ There are a number of situations where a common interchange format is
+ desirable. For example, one might wish to export a copy of the
+ contents of a directory server to a file, move that file to a
+ different machine, and import the contents into a second directory
+ server.
+
+ Additionally, by using a well-defined interchange format, development
+ of data import tools from legacy systems is facilitated. A fairly
+ simple set of tools written in awk or perl can, for example, convert
+ a database of personnel information into an LDIF file. This file can
+ then be imported into a directory server, regardless of the internal
+ database representation the target directory server uses.
+
+ The LDIF format was originally developed and used in the University
+ of Michigan LDAP implementation. The first use of LDIF was in
+ describing directory entries. Later, the format was expanded to
+ allow representation of changes to directory entries.
+
+
+
+
+Good Standards Track [Page 1]
+
+RFC 2849 LDAP Data Interchange Format June 2000
+
+
+ Relationship to the application/directory MIME content-type:
+
+ The application/directory MIME content-type [1] is a general
+ framework and format for conveying directory information, and is
+ independent of any particular directory service. The LDIF format is
+ a simpler format which is perhaps easier to create, and may also be
+ used, as noted, to describe a set of changes to be applied to a
+ directory.
+
+ The key words "MUST", "MUST NOT", "MAY", "SHOULD", and "SHOULD NOT"
+ used in this document are to be interpreted as described in [7].
+
+Definition of the LDAP Data Interchange Format
+
+ The LDIF format is used to convey directory information, or a
+ description of a set of changes made to directory entries. An LDIF
+ file consists of a series of records separated by line separators. A
+ record consists of a sequence of lines describing a directory entry,
+ or a sequence of lines describing a set of changes to a directory
+ entry. An LDIF file specifies a set of directory entries, or a set
+ of changes to be applied to directory entries, but not both.
+
+ There is a one-to-one correlation between LDAP operations that modify
+ the directory (add, delete, modify, and modrdn), and the types of
+ changerecords described below ("add", "delete", "modify", and
+ "modrdn" or "moddn"). This correspondence is intentional, and
+ permits a straightforward translation from LDIF changerecords to
+ protocol operations.
+
+Formal Syntax Definition of LDIF
+
+ The following definition uses the augmented Backus-Naur Form
+ specified in RFC 2234 [2].
+
+ldif-file = ldif-content / ldif-changes
+
+ldif-content = version-spec 1*(1*SEP ldif-attrval-record)
+
+ldif-changes = version-spec 1*(1*SEP ldif-change-record)
+
+ldif-attrval-record = dn-spec SEP 1*attrval-spec
+
+ldif-change-record = dn-spec SEP *control changerecord
+
+version-spec = "version:" FILL version-number
+
+
+
+
+
+
+Good Standards Track [Page 2]
+
+RFC 2849 LDAP Data Interchange Format June 2000
+
+
+version-number = 1*DIGIT
+ ; version-number MUST be "1" for the
+ ; LDIF format described in this document.
+
+dn-spec = "dn:" (FILL distinguishedName /
+ ":" FILL base64-distinguishedName)
+
+distinguishedName = SAFE-STRING
+ ; a distinguished name, as defined in [3]
+
+base64-distinguishedName = BASE64-UTF8-STRING
+ ; a distinguishedName which has been base64
+ ; encoded (see note 10, below)
+
+rdn = SAFE-STRING
+ ; a relative distinguished name, defined as
+ ; <name-component> in [3]
+
+base64-rdn = BASE64-UTF8-STRING
+ ; an rdn which has been base64 encoded (see
+ ; note 10, below)
+
+control = "control:" FILL ldap-oid ; controlType
+ 0*1(1*SPACE ("true" / "false")) ; criticality
+ 0*1(value-spec) ; controlValue
+ SEP
+ ; (See note 9, below)
+
+ldap-oid = 1*DIGIT 0*1("." 1*DIGIT)
+ ; An LDAPOID, as defined in [4]
+
+attrval-spec = AttributeDescription value-spec SEP
+
+value-spec = ":" ( FILL 0*1(SAFE-STRING) /
+ ":" FILL (BASE64-STRING) /
+ "<" FILL url)
+ ; See notes 7 and 8, below
+
+url = <a Uniform Resource Locator,
+ as defined in [6]>
+ ; (See Note 6, below)
+
+AttributeDescription = AttributeType [";" options]
+ ; Definition taken from [4]
+
+AttributeType = ldap-oid / (ALPHA *(attr-type-chars))
+
+options = option / (option ";" options)
+
+
+
+Good Standards Track [Page 3]
+
+RFC 2849 LDAP Data Interchange Format June 2000
+
+
+option = 1*opt-char
+
+attr-type-chars = ALPHA / DIGIT / "-"
+
+opt-char = attr-type-chars
+
+changerecord = "changetype:" FILL
+ (change-add / change-delete /
+ change-modify / change-moddn)
+
+change-add = "add" SEP 1*attrval-spec
+
+change-delete = "delete" SEP
+
+change-moddn = ("modrdn" / "moddn") SEP
+ "newrdn:" ( FILL rdn /
+ ":" FILL base64-rdn) SEP
+ "deleteoldrdn:" FILL ("0" / "1") SEP
+ 0*1("newsuperior:"
+ ( FILL distinguishedName /
+ ":" FILL base64-distinguishedName) SEP)
+
+change-modify = "modify" SEP *mod-spec
+
+mod-spec = ("add:" / "delete:" / "replace:")
+ FILL AttributeDescription SEP
+ *attrval-spec
+ "-" SEP
+
+SPACE = %x20
+ ; ASCII SP, space
+
+FILL = *SPACE
+
+SEP = (CR LF / LF)
+
+CR = %x0D
+ ; ASCII CR, carriage return
+
+LF = %x0A
+ ; ASCII LF, line feed
+
+ALPHA = %x41-5A / %x61-7A
+ ; A-Z / a-z
+
+DIGIT = %x30-39
+ ; 0-9
+
+
+
+
+Good Standards Track [Page 4]
+
+RFC 2849 LDAP Data Interchange Format June 2000
+
+
+UTF8-1 = %x80-BF
+
+UTF8-2 = %xC0-DF UTF8-1
+
+UTF8-3 = %xE0-EF 2UTF8-1
+
+UTF8-4 = %xF0-F7 3UTF8-1
+
+UTF8-5 = %xF8-FB 4UTF8-1
+
+UTF8-6 = %xFC-FD 5UTF8-1
+
+SAFE-CHAR = %x01-09 / %x0B-0C / %x0E-7F
+ ; any value <= 127 decimal except NUL, LF,
+ ; and CR
+
+SAFE-INIT-CHAR = %x01-09 / %x0B-0C / %x0E-1F /
+ %x21-39 / %x3B / %x3D-7F
+ ; any value <= 127 except NUL, LF, CR,
+ ; SPACE, colon (":", ASCII 58 decimal)
+ ; and less-than ("<" , ASCII 60 decimal)
+
+SAFE-STRING = [SAFE-INIT-CHAR *SAFE-CHAR]
+
+UTF8-CHAR = SAFE-CHAR / UTF8-2 / UTF8-3 /
+ UTF8-4 / UTF8-5 / UTF8-6
+
+UTF8-STRING = *UTF8-CHAR
+
+BASE64-UTF8-STRING = BASE64-STRING
+ ; MUST be the base64 encoding of a
+ ; UTF8-STRING
+
+BASE64-CHAR = %x2B / %x2F / %x30-39 / %x3D / %x41-5A /
+ %x61-7A
+ ; +, /, 0-9, =, A-Z, and a-z
+ ; as specified in [5]
+
+BASE64-STRING = [*(BASE64-CHAR)]
+
+
+ Notes on LDIF Syntax
+
+ 1) For the LDIF format described in this document, the version
+ number MUST be "1". If the version number is absent,
+ implementations MAY choose to interpret the contents as an
+ older LDIF file format, supported by the University of
+ Michigan ldap-3.3 implementation [8].
+
+
+
+Good Standards Track [Page 5]
+
+RFC 2849 LDAP Data Interchange Format June 2000
+
+
+ 2) Any non-empty line, including comment lines, in an LDIF file
+ MAY be folded by inserting a line separator (SEP) and a SPACE.
+ Folding MUST NOT occur before the first character of the line.
+ In other words, folding a line into two lines, the first of
+ which is empty, is not permitted. Any line that begins with a
+ single space MUST be treated as a continuation of the previous
+ (non-empty) line. When joining folded lines, exactly one space
+ character at the beginning of each continued line must be
+ discarded. Implementations SHOULD NOT fold lines in the middle
+ of a multi-byte UTF-8 character.
+
+ 3) Any line that begins with a pound-sign ("#", ASCII 35) is a
+ comment line, and MUST be ignored when parsing an LDIF file.
+
+ 4) Any dn or rdn that contains characters other than those
+ defined as "SAFE-UTF8-CHAR", or begins with a character other
+ than those defined as "SAFE-INIT-UTF8-CHAR", above, MUST be
+ base-64 encoded. Other values MAY be base-64 encoded. Any
+ value that contains characters other than those defined as
+ "SAFE-CHAR", or begins with a character other than those
+ defined as "SAFE-INIT-CHAR", above, MUST be base-64 encoded.
+ Other values MAY be base-64 encoded.
+
+ 5) When a zero-length attribute value is to be included directly
+ in an LDIF file, it MUST be represented as
+ AttributeDescription ":" FILL SEP. For example, "seeAlso:"
+ followed by a newline represents a zero-length "seeAlso"
+ attribute value. It is also permissible for the value
+ referred to by a URL to be of zero length.
+
+ 6) When a URL is specified in an attrval-spec, the following
+ conventions apply:
+
+ a) Implementations SHOULD support the file:// URL format. The
+ contents of the referenced file are to be included verbatim
+ in the interpreted output of the LDIF file.
+ b) Implementations MAY support other URL formats. The
+ semantics associated with each supported URL will be
+ documented in an associated Applicability Statement.
+
+ 7) Distinguished names, relative distinguished names, and
+ attribute values of DirectoryString syntax MUST be valid UTF-8
+ strings. Implementations that read LDIF MAY interpret files
+ in which these entities are stored in some other character set
+ encoding, but implementations MUST NOT generate LDIF content
+ which does not contain valid UTF-8 data.
+
+
+
+
+
+Good Standards Track [Page 6]
+
+RFC 2849 LDAP Data Interchange Format June 2000
+
+
+ 8) Values or distinguished names that end with SPACE SHOULD be
+ base-64 encoded.
+
+ 9) When controls are included in an LDIF file, implementations
+ MAY choose to ignore some or all of them. This may be
+ necessary if the changes described in the LDIF file are being
+ sent on an LDAPv2 connection (LDAPv2 does not support
+ controls), or the particular controls are not supported by the
+ remote server. If the criticality of a control is "true", then
+ the implementation MUST either include the control, or MUST
+ NOT send the operation to a remote server.
+
+ 10) When an attrval-spec, distinguishedName, or rdn is base64-
+ encoded, the encoding rules specified in [5] are used with the
+ following exceptions: a) The requirement that base64 output
+ streams must be represented as lines of no more than 76
+ characters is removed. Lines in LDIF files may only be folded
+ according to the folding rules described in note 2, above. b)
+ Base64 strings in [5] may contain characters other than those
+ defined in BASE64-CHAR, and are ignored. LDIF does not permit
+ any extraneous characters, other than those used for line
+ folding.
+
+Examples of LDAP Data Interchange Format
+
+Example 1: An simple LDAP file with two entries
+
+version: 1
+dn: cn=Barbara Jensen, ou=Product Development, dc=airius, dc=com
+objectclass: top
+objectclass: person
+objectclass: organizationalPerson
+cn: Barbara Jensen
+cn: Barbara J Jensen
+cn: Babs Jensen
+sn: Jensen
+uid: bjensen
+telephonenumber: +1 408 555 1212
+description: A big sailing fan.
+
+dn: cn=Bjorn Jensen, ou=Accounting, dc=airius, dc=com
+objectclass: top
+objectclass: person
+objectclass: organizationalPerson
+cn: Bjorn Jensen
+sn: Jensen
+telephonenumber: +1 408 555 1212
+
+
+
+
+Good Standards Track [Page 7]
+
+RFC 2849 LDAP Data Interchange Format June 2000
+
+
+Example 2: A file containing an entry with a folded attribute value
+
+version: 1
+dn:cn=Barbara Jensen, ou=Product Development, dc=airius, dc=com
+objectclass:top
+objectclass:person
+objectclass:organizationalPerson
+cn:Barbara Jensen
+cn:Barbara J Jensen
+cn:Babs Jensen
+sn:Jensen
+uid:bjensen
+telephonenumber:+1 408 555 1212
+description:Babs is a big sailing fan, and travels extensively in sea
+ rch of perfect sailing conditions.
+title:Product Manager, Rod and Reel Division
+
+Example 3: A file containing a base-64-encoded value
+
+version: 1
+dn: cn=Gern Jensen, ou=Product Testing, dc=airius, dc=com
+objectclass: top
+objectclass: person
+objectclass: organizationalPerson
+cn: Gern Jensen
+cn: Gern O Jensen
+sn: Jensen
+uid: gernj
+telephonenumber: +1 408 555 1212
+description:: V2hhdCBhIGNhcmVmdWwgcmVhZGVyIHlvdSBhcmUhICBUaGlzIHZhbHVl
+IGlzIGJhc2UtNjQtZW5jb2RlZCBiZWNhdXNlIGl0IGhhcyBhIGNvbnRyb2wgY2hhcmFjdG
+VyIGluIGl0IChhIENSKS4NICBCeSB0aGUgd2F5LCB5b3Ugc2hvdWxkIHJlYWxseSBnZXQg
+b3V0IG1vcmUu
+
+Example 4: A file containing an entries with UTF-8-encoded attribute
+values, including language tags. Comments indicate the contents
+of UTF-8-encoded attributes and distinguished names.
+
+version: 1
+dn:: b3U95Za25qWt6YOoLG89QWlyaXVz
+# dn:: ou=<JapaneseOU>,o=Airius
+objectclass: top
+objectclass: organizationalUnit
+ou:: 5Za25qWt6YOo
+# ou:: <JapaneseOU>
+ou;lang-ja:: 5Za25qWt6YOo
+# ou;lang-ja:: <JapaneseOU>
+ou;lang-ja;phonetic:: 44GI44GE44GO44KH44GG44G2
+
+
+
+Good Standards Track [Page 8]
+
+RFC 2849 LDAP Data Interchange Format June 2000
+
+
+# ou;lang-ja:: <JapaneseOU_in_phonetic_representation>
+ou;lang-en: Sales
+description: Japanese office
+
+dn:: dWlkPXJvZ2FzYXdhcmEsb3U95Za25qWt6YOoLG89QWlyaXVz
+# dn:: uid=<uid>,ou=<JapaneseOU>,o=Airius
+userpassword: {SHA}O3HSv1MusyL4kTjP+HKI5uxuNoM=
+objectclass: top
+objectclass: person
+objectclass: organizationalPerson
+objectclass: inetOrgPerson
+uid: rogasawara
+mail: rogasawara@airius.co.jp
+givenname;lang-ja:: 44Ot44OJ44OL44O8
+# givenname;lang-ja:: <JapaneseGivenname>
+sn;lang-ja:: 5bCP56yg5Y6f
+# sn;lang-ja:: <JapaneseSn>
+cn;lang-ja:: 5bCP56yg5Y6fIOODreODieODi+ODvA==
+# cn;lang-ja:: <JapaneseCn>
+title;lang-ja:: 5Za25qWt6YOoIOmDqOmVtw==
+# title;lang-ja:: <JapaneseTitle>
+preferredlanguage: ja
+givenname:: 44Ot44OJ44OL44O8
+# givenname:: <JapaneseGivenname>
+sn:: 5bCP56yg5Y6f
+# sn:: <JapaneseSn>
+cn:: 5bCP56yg5Y6fIOODreODieODi+ODvA==
+# cn:: <JapaneseCn>
+title:: 5Za25qWt6YOoIOmDqOmVtw==
+# title:: <JapaneseTitle>
+givenname;lang-ja;phonetic:: 44KN44Gp44Gr44O8
+# givenname;lang-ja;phonetic::
+<JapaneseGivenname_in_phonetic_representation_kana>
+sn;lang-ja;phonetic:: 44GK44GM44GV44KP44KJ
+# sn;lang-ja;phonetic:: <JapaneseSn_in_phonetic_representation_kana>
+cn;lang-ja;phonetic:: 44GK44GM44GV44KP44KJIOOCjeOBqeOBq+ODvA==
+# cn;lang-ja;phonetic:: <JapaneseCn_in_phonetic_representation_kana>
+title;lang-ja;phonetic:: 44GI44GE44GO44KH44GG44G2IOOBtuOBoeOCh+OBhg==
+# title;lang-ja;phonetic::
+# <JapaneseTitle_in_phonetic_representation_kana>
+givenname;lang-en: Rodney
+sn;lang-en: Ogasawara
+cn;lang-en: Rodney Ogasawara
+title;lang-en: Sales, Director
+
+
+
+
+
+
+
+Good Standards Track [Page 9]
+
+RFC 2849 LDAP Data Interchange Format June 2000
+
+
+Example 5: A file containing a reference to an external file
+
+version: 1
+dn: cn=Horatio Jensen, ou=Product Testing, dc=airius, dc=com
+objectclass: top
+objectclass: person
+objectclass: organizationalPerson
+cn: Horatio Jensen
+
+cn: Horatio N Jensen
+sn: Jensen
+uid: hjensen
+telephonenumber: +1 408 555 1212
+jpegphoto:< file:///usr/local/directory/photos/hjensen.jpg
+
+Example 6: A file containing a series of change records and comments
+
+version: 1
+# Add a new entry
+dn: cn=Fiona Jensen, ou=Marketing, dc=airius, dc=com
+changetype: add
+objectclass: top
+objectclass: person
+objectclass: organizationalPerson
+cn: Fiona Jensen
+sn: Jensen
+uid: fiona
+telephonenumber: +1 408 555 1212
+jpegphoto:< file:///usr/local/directory/photos/fiona.jpg
+
+# Delete an existing entry
+dn: cn=Robert Jensen, ou=Marketing, dc=airius, dc=com
+changetype: delete
+
+# Modify an entry's relative distinguished name
+dn: cn=Paul Jensen, ou=Product Development, dc=airius, dc=com
+changetype: modrdn
+newrdn: cn=Paula Jensen
+deleteoldrdn: 1
+
+# Rename an entry and move all of its children to a new location in
+# the directory tree (only implemented by LDAPv3 servers).
+dn: ou=PD Accountants, ou=Product Development, dc=airius, dc=com
+changetype: modrdn
+newrdn: ou=Product Development Accountants
+deleteoldrdn: 0
+newsuperior: ou=Accounting, dc=airius, dc=com
+
+
+
+
+Good Standards Track [Page 10]
+
+RFC 2849 LDAP Data Interchange Format June 2000
+
+
+# Modify an entry: add an additional value to the postaladdress
+# attribute, completely delete the description attribute, replace
+# the telephonenumber attribute with two values, and delete a specific
+# value from the facsimiletelephonenumber attribute
+dn: cn=Paula Jensen, ou=Product Development, dc=airius, dc=com
+changetype: modify
+add: postaladdress
+postaladdress: 123 Anystreet $ Sunnyvale, CA $ 94086
+-
+
+delete: description
+-
+replace: telephonenumber
+telephonenumber: +1 408 555 1234
+telephonenumber: +1 408 555 5678
+-
+delete: facsimiletelephonenumber
+facsimiletelephonenumber: +1 408 555 9876
+-
+
+# Modify an entry: replace the postaladdress attribute with an empty
+# set of values (which will cause the attribute to be removed), and
+# delete the entire description attribute. Note that the first will
+# always succeed, while the second will only succeed if at least
+# one value for the description attribute is present.
+dn: cn=Ingrid Jensen, ou=Product Support, dc=airius, dc=com
+changetype: modify
+replace: postaladdress
+-
+delete: description
+-
+
+Example 7: An LDIF file containing a change record with a control
+version: 1
+# Delete an entry. The operation will attach the LDAPv3
+# Tree Delete Control defined in [9]. The criticality
+# field is "true" and the controlValue field is
+# absent, as required by [9].
+dn: ou=Product Development, dc=airius, dc=com
+control: 1.2.840.113556.1.4.805 true
+changetype: delete
+
+
+
+
+
+
+
+
+
+
+Good Standards Track [Page 11]
+
+RFC 2849 LDAP Data Interchange Format June 2000
+
+
+Security Considerations
+
+ Given typical directory applications, an LDIF file is likely to
+ contain sensitive personal data. Appropriate measures should be
+ taken to protect the privacy of those persons whose data is contained
+ in an LDIF file.
+
+ Since ":<" directives can cause external content to be included when
+ processing an LDIF file, one should be cautious of accepting LDIF
+ files from external sources. A "trojan" LDIF file could name a file
+ with sensitive contents and cause it to be included in a directory
+ entry, which a hostile entity could read via LDAP.
+
+ LDIF does not provide any method for carrying authentication
+ information with an LDIF file. Users of LDIF files must take care to
+ verify the integrity of an LDIF file received from an external
+ source.
+
+Acknowledgments
+
+ The LDAP Interchange Format was developed as part of the University
+ of Michigan LDAP reference implementation, and was developed by Tim
+ Howes, Mark Smith, and Gordon Good. It is based in part upon work
+ supported by the National Science Foundation under Grant No. NCR-
+ 9416667.
+
+ Members of the IETF LDAP Extensions Working group provided many
+ helpful suggestions. In particular, Hallvard B. Furuseth of the
+ University of Oslo made many significant contributions to this
+ document, including a thorough review and rewrite of the BNF.
+
+References
+
+ [1] Howes, T. and M. Smith, "A MIME Content-Type for Directory
+ Information", RFC 2425, September 1998.
+
+ [2] Crocker, D., and P. Overell, "Augmented BNF for Syntax
+ Specifications: ABNF", RFC 2234, November 1997.
+
+ [3] Wahl, M., Kille, S. and T. Howes, "A String Representation of
+ Distinguished Names", RFC 2253, December 1997.
+
+ [4] Wahl, M., Howes, T. and S. Kille, "Lightweight Directory Access
+ Protocol (v3)", RFC 2251, July 1997.
+
+ [5] Freed, N. and N. Borenstein, "Multipurpose Internet Mail
+ Extensions (MIME) Part One: Format of Internet Message Bodies",
+ RFC 2045, November 1996.
+
+
+
+Good Standards Track [Page 12]
+
+RFC 2849 LDAP Data Interchange Format June 2000
+
+
+ [6] Berners-Lee, T., Masinter, L. and M. McCahill, "Uniform
+ Resource Locators (URL)", RFC 1738, December 1994.
+
+ [7] Bradner, S., "Key Words for use in RFCs to Indicate Requirement
+ Levels", BCP 14, RFC 2119, March 1997.
+
+ [8] The SLAPD and SLURPD Administrators Guide. University of
+ Michigan, April 1996. <URL:
+ http://www.umich.edu/~dirsvcs/ldap/doc/guides/slapd/toc.html>
+
+ [9] M. P. Armijo, "Tree Delete Control", Work in Progress.
+
+Author's Address
+
+ Gordon Good
+ iPlanet e-commerce Solutions
+ 150 Network Circle
+ Mailstop USCA17-201
+ Santa Clara, CA 95054, USA
+
+ Phone: +1 408 276 4351
+ EMail: ggood@netscape.com
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+Good Standards Track [Page 13]
+
+RFC 2849 LDAP Data Interchange Format June 2000
+
+
+Full Copyright Statement
+
+ Copyright (C) The Internet Society (2000). All Rights Reserved.
+
+ This document and translations of it may be copied and furnished to
+ others, and derivative works that comment on or otherwise explain it
+ or assist in its implementation may be prepared, copied, published
+ and distributed, in whole or in part, without restriction of any
+ kind, provided that the above copyright notice and this paragraph are
+ included on all such copies and derivative works. However, this
+ document itself may not be modified in any way, such as by removing
+ the copyright notice or references to the Internet Society or other
+ Internet organizations, except as needed for the purpose of
+ developing Internet standards in which case the procedures for
+ copyrights defined in the Internet Standards process must be
+ followed, or as required to translate it into languages other than
+ English.
+
+ The limited permissions granted above are perpetual and will not be
+ revoked by the Internet Society or its successors or assigns.
+
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+Acknowledgement
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+ Funding for the RFC Editor function is currently provided by the
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+Good Standards Track [Page 14]
+