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Internet-Draft This memo provides for an extension to RFC 8520 (Manufacturer Usage Description Specification, MUD) that allows MUD file authors to specify ownership and licensing of MUD files themselves. This memo updates RFC 8520. However, it can also be used for purposes outside of MUD, and the grouping is structured as such.

Introduction Manufacturer Usage Descriptions (MUD) can be used to describe devices and their requirements to the network infrastructure. The original version of the specification does not provide for a means to specify ownership and licensing of the MUD file itself. This can hinder those wishing to use, modify, or adapt MUD files for the purpose of offering them, when the manufacturer is not involved. Issue: Should this be an owner or an originator? To avoid any confusion, we define an extension that allows for specifying of owners and licensing terms for MUD files. Those generating MUD files SHOULD use this extension, and thus this extension updates RFC 8520. There are two ways to specify a license: a URL pointing to the license itself or an SPDX tag . If an SPDX tag is supplied consumers MUST interpret that tag through its meaning as specified by . Issue: Should we simply say that a URI contains a colon and SPDX license identifier doesn't? This grouping may be used for other YANG models that reside as static objects. The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 when, and only when, they appear in all capitals, as shown here.

The owner-license extension and model Because the model is primarily motivated by MUD, and based on the way that YANG trees are formed, the model appears as an augmentation for MUD.

Issue: Should different owners possibly have their own license types? (Logical and, derived works.) Issue: Should a single owner possibly have multiple license types? (Logical or, multi-licensing.)

The YANG schema for ownership and licensing The following grouping and augmentation are proposed.

"; description "This YANG module to indicate ownership and licensing. Copyright (c) 2025 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Revised BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX (https://www.rfc-editor.org/info/rfcXXXX); see the RFC itself for full legal notices."; revision 2024-04-26 { description "Initial revision."; reference "RFC XXXX: Ownership and Licensing Statements in YANG"; } grouping owner-license-grouping { description "A grouping expression ownership and license information"; container ol { description "container relating to ownership and licensing."; list license { key "owner-name"; description "list of licenses that may be applied."; leaf owner-name { type string { length "1..128"; } description "name of the owner"; } choice license-type { description "Either choose a standard license type or point to one of your own."; case spdx-lt { leaf-list spdx-tag { type string; min-elements 1; description "SPDX License Identifier, as indicated at https://spdx.org/licenses/"; } } case url { leaf-list license-info { type inet:uri; min-elements 1; description "A URL pointing to licensing information."; } } } } } } augment "/ietf-mud:mud" { description "Add extension for Ownership and licensing."; uses owner-license-grouping; } } ]]>

Extension for MUD MUD files using this extension MUST include "ol" in the extensions array, as specified by .

Example In this example, the Frobmaster company is using the 0BSD SPDX tag to indicate a relatively open license. The "ol" extension and container are present. There is a single owner listed.

Task: need Makefile for validating this against MUD. (Probably put this into a separate file, too.) Issue: Should we give an example for usage outside yang?

Security Considerations The security considerations of with respect to obtaining validation for information claimed in a MUD file do apply. While the information described in this specification is not intended to directly influence the behavior of protective infrastructure, it may be used by an aggregator as input for deciding the legal basis that enables providing aggregated information; depending on the juridical environment, false information in the MUD file may thus expose the aggregator to additional legal risk.

IANA Considerations

MUD Extension The IANA is requested to add "ol" to the of as follows:

Extension Name:

ol

Standard reference:

This document

XML Name Space Entry This document requests IANA to register the following URI in the "ns" subregistry within the "IETF XML Registry" in accordance with :

URI:

urn:ietf:params:xml:ns:yang:ietf-ol

Registrant Contact:

The IESG.

XML: N/A; the requested URI is an XML namespace.

YANG Module Names This document requests IANA to register the following YANG module in the "YANG Module Names" subregistry in accordance with within the "YANG Parameters" registry.

name:

ietf-ol

namespace:

urn:ietf:params:xml:ns:yang:ietf-ol

maintained by IANA:

N

prefix:

ol

reference:

RFC XXXX

This memo specifies a component-based architecture for Manufacturer Usage Descriptions (MUDs). The goal of MUD is to provide a means for end devices to signal to the network what sort of access and network functionality they require to properly function. The initial focus is on access control. Later work can delve into other aspects. This memo specifies two YANG modules, IPv4 and IPv6 DHCP options, a Link Layer Discovery Protocol (LLDP) TLV, a URL, an X.509 certificate extension, and a means to sign and verify the descriptions. IANA The Linux Foundation In many standards track documents several words are used to signify the requirements in the specification. These words are often capitalized. This document defines these words as they should be interpreted in IETF documents. This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements. RFC 2119 specifies common key words that may be used in protocol specifications. This document aims to reduce the ambiguity by clarifying that only UPPERCASE usage of the key words have the defined special meanings. This document describes an IANA maintained registry for IETF standards which use Extensible Markup Language (XML) related items such as Namespaces, Document Type Declarations (DTDs), Schemas, and Resource Description Framework (RDF) Schemas. YANG is a data modeling language used to model configuration and state data manipulated by the Network Configuration Protocol (NETCONF), NETCONF remote procedure calls, and NETCONF notifications. [STANDARDS-TRACK]

Changes from Earlier Versions Draft -02: Small updates to the example Draft -01: Format IANA considerations Discuss security considerations Draft -00: Resubmit unchanged Individual Draft -01: Add some issues correct spacing Individual Draft -00: Initial revision