ISO/IEC 21000-23:2022

Overview - ISO/IEC 21000-23:2022 (MPEG-21 Part 23: Smart Contracts for Media)

ISO/IEC 21000-23:2022 defines a framework for converting MPEG-21 media contracts (expressed in XML and RDF using MPEG-21 CEL and MCO) into smart contracts executable on existing Distributed Ledger Technology (DLT) environments, and vice versa. The standard specifies the protocols, application programming interfaces (APIs), and components needed to enable bidirectional conversion between MPEG-21 Contract Expression Language (CEL) / Media Contract Ontology (MCO) documents and DLT-executable smart contracts, while supporting related runtime features such as token and payment management.

Key Topics and Technical Requirements

• Bidirectional conversion: Methods for converting MPEG-21 CEL/MCO contracts to smart contracts and converting smart contracts back to MPEG-21 CEL/MCO.
• Parser and generator APIs: Defined APIs for MPEG-21 CEL/MCO parsers and generators to automate transformations.
• Smart contract generator & parser: Components to produce DLT-targeted smart contract code and to interpret smart contracts back into MPEG-21 representations.
• DLT tokens and payments manager: Interfaces and workflow descriptions for integrating tokenization and on‑ledger payments with media contracts.
• Contractual object model: API surface for media contractual objects (Contract, Party, Deontic, Action, Object, Fact, etc.) as identified in the standard.
• Narrative contracts: Support for human-readable narrative constructs alongside machine-executable clauses.
• Reference software and conformance: Guidance on template contracts, example parsers/generators, OpenAPI bindings, demo implementations and conformance testing.
• Namespaces, conventions, and data modelling: Representation conventions (classes, namespace prefixes) to ensure consistent mapping between XML/RDF and smart contract semantics.

Practical Applications and Who Uses This Standard

ISO/IEC 21000-23 enables interoperability between traditional media-license representations and blockchain/DLT-based automation. Typical applications:

• Automated licensing and royalty payments - convert standardized media rights into smart contracts that trigger payments and rights delivery.
• Tokenization of media assets - map MPEG-21 contract terms to on-chain tokens and payment logic.
• Interoperable rights management - ensure consistent semantics between XML/RDF contract stores and DLT environments.
• Platform and middleware development - streaming platforms, rights-management systems, and blockchain integrators use the APIs and converters for deployment.

Primary users:

• Media companies, rights holders, and collective management organizations
• Blockchain/DLT developers and integration engineers
• DRM and content distribution platform architects
• Standards implementers and legal-technology teams

Related Standards

• ISO/IEC 21000-19, -20, -21 - MPEG-21 contract expression and ontology documents (CEL and MCO) that ISO/IEC 21000-23 maps to/from DLT smart contracts.

Keywords: ISO/IEC 21000-23, MPEG-21, smart contracts for media, media contracts, DLT, blockchain, CEL, MCO, XML, RDF, tokenization, API, contract conversion, OpenAPI.