CCSDSThe Open Archival Information System is the foundational reference model for organizations responsible for the long-term preservation of digital information. Published jointly as CCSDS 650.0-M-3 and ISO 14721:2025, OAIS provides a shared vocabulary and conceptual architecture that has shaped how national archives, research libraries, and data repositories design and evaluate their preservation systems.
Background
OAIS originated in the early 1990s within the Consultative Committee for Space Data Systems (CCSDS), a body primarily concerned with space agency data. Recognizing that space mission data faced the same long-term preservation challenges as cultural and scientific heritage, CCSDS convened a working group that developed the reference model through the decade with broad input from the archives and library communities. The first edition was published in 2002 as a CCSDS Recommendation and adopted as ISO 14721:2003. The second edition (ISO 14721:2012) refined the model based on a decade of implementation experience. The current third edition, CCSDS 650.0-M-3 (December 2024), is identical to ISO 14721:2025.
The "Open" in OAIS refers to the open, consensus-based process by which the standard was developed, not to open access or open-source principles. The "Information" refers specifically to data that can be shared or exchanged.
Purpose & Scope
OAIS is a conceptual framework, not a software specification. It does not prescribe any particular computing platform, database system, or technology. Instead, it defines the activities, responsibilities, and information flows involved in preserving digital archives. "Long term" in the OAIS sense means long enough to be concerned with the impact of changing technologies, including new media and data formats, or with a changing user community -- potentially indefinitely.
The model applies to any archive that needs to make information available to a Designated Community over time, whether the archive is open access, closed, restricted, or proprietary.
The OAIS Environment and Information Model
The OAIS environment involves four entities: Producers (who submit information), Consumers (the Designated Community), Management (which sets archive policies), and the Archive itself.
The model defines three types of information packages:
| Package | Role |
|---|---|
| Submission Information Package (SIP) | Information sent from the Producer to the Archive |
| Archival Information Package (AIP) | Information stored within the Archive, including Content Information and Preservation Description Information |
| Dissemination Information Package (DIP) | Information delivered to a Consumer upon request |
Each information package includes Content Information (the data object and its representation information), Preservation Description Information (provenance, identifiers, checksums), Packaging Information, and Descriptive Information (metadata for discovery).
Functional Entities
OAIS defines six functional entities that describe the operational responsibilities of an archive:
| Function | Responsibility |
|---|---|
| Ingest | Receives SIPs, verifies them, creates AIPs, transfers to storage |
| Archival Storage | Stores, maintains, migrates, and retrieves AIPs |
| Data Management | Maintains descriptive metadata and the archive database |
| Administration | Manages daily operations, policies, submission agreements |
| Preservation Planning | Monitors technology changes, develops migration strategies, assesses risk |
| Access | Provides the user interface, generates DIPs from AIPs |
Governance & Maintenance
OAIS is maintained jointly by CCSDS (as a Magenta Book recommendation) and ISO (as ISO 14721). CCSDS publishes the full text of the recommendation freely. The related standard ISO 16363 provides criteria for auditing and certifying trustworthy digital repositories based on OAIS principles, and the Centre of Excellence for Digital Preservation (C-DAC, India) achieved ISO 16363 certification for the National Cultural Audiovisual Archive in 2017.
Notable Implementations
OAIS has been adopted as the conceptual foundation for digital preservation systems at the Library of Congress, British Library, National Archives and Records Administration (NARA), National Library of the Netherlands, and many other national institutions. Repository software such as Archivematica, Preservica, and Rosetta explicitly implements OAIS functional entities. The standard underpins the PREMIS preservation metadata schema and the Trustworthy Repositories Audit & Certification (TRAC) framework. JSTOR, OCLC, and the Digital Curation Centre in the UK all reference OAIS in their preservation architectures.
Related Standards
- PREMIS -- Operationalizes OAIS information model concepts into a concrete preservation metadata schema
- ISO 16363 -- Audit and certification framework for trustworthy digital repositories based on OAIS
- ISO 19165 -- Recommends using Open Packaging Conventions to implement geospatial packages within the OAIS framework