CLOCKSS

What CLOCKSS does

CLOCKSS, legally organized as Digital Distributed Community Archive (dba CLOCKSS Archive), is a tax-exempt nonprofit (501(c)(3)) organization incorporated in California and operationally headquartered at Stanford University's Cecil H. Green Library. Founded as a digital preservation archive built on the LOCKSS (Lots of Copies Keep Stuff Safe) technology developed at Stanford, CLOCKSS operates as a community-led collaboration of academic libraries and publishers, providing long-term preservation services for journal articles, books, and digital collections. As of the latest reporting it holds 64.5 million journal articles, 586,045 books, and 82 triggered titles released under Creative Commons Open Access licenses after publishers ceased operations or discontinued titles, and it serves 300 supporting academic libraries and 809 participating publishers worldwide.

Name

CLOCKSS

Legal name

Digital Distributed Community Archive

Website

https://clockss.org

Company type

Private

Founded year

2009

Operating status

Operating

Headcount range

1–10 employees

Short description

CLOCKSS is a nonprofit 501(c)(3) digital preservation organization that safeguards scholarly journals, books, and digital collections across 12 distributed archive nodes at research libraries worldwide, serving 300 supporting academic libraries and 809 participating publishers with LOCKSS technology and CC Open Access triggering.

Ownership category

akta.pro rank

Product category

Digital Preservation Services

NAICS

Libraries and Archives (519210), Libraries and Archives (51921)

SIC

Magnetic & Optical Recording Media (3695)

akta.pro primary industry

Archives, Special Collections & Preservation Operations (Rare Materials, Conservation) (EDAEAGAJ)

akta.pro secondary industry

Public Media Archives, Libraries & Content Preservation (MPABADAL)

Keywords

• Digital preservation services
• Scholarly content archiving
• Distributed digital archive
• Library preservation software
• Open access repositories

Headquarters

HQ city

Stanford

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Software

Cost components

Technology or R&D, Operations, Personnel, Others

Revenue model

1. Library Membership/Sponsorship: Academic libraries pay membership/sponsorship fees to support the CLOCKSS archive and gain access to preservation services and community governance participation.
2. Publisher Participation Fees: Academic publishers pay fees to participate in the CLOCKSS archive, having their content preserved for long-term access.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels5 records

Core offering

CLOCKSS provides a sustainable, geographically distributed digital preservation archive for scholarly content (journal articles, books, and digital collections) using LOCKSS-based technology across 12 archive nodes at leading research libraries. Content is preserved in a dark archive with no user access unless a trigger event occurs, at which point CLOCKSS releases the content to permanent open access under Creative Commons licenses. The organization serves academic libraries (membership/sponsorship) and academic publishers (participation fees).

Product overview

CLOCKSS is a digital preservation organization offering a suite of interconnected services centered on the CLOCKSS Archive. The core offering is the distributed dark archive that preserves scholarly content (64.5 million journal articles, 586,045 books) across 12 global nodes using LOCKSS technology. When content triggers (becomes permanently unavailable), the Triggered Content Service makes it openly accessible under Creative Commons licenses. CLOCKSS leverages LOCKSS 2.0 for enhanced interoperability, and the Global LOCKSS Network provides additional preservation options for institutions seeking alternatives to commercial cloud services.

Differentiator

Problem solved

Functional benefit

Products and services

• CLOCKSS Archive Distributed dark-archive preservation service for academic libraries and publishers; preserves scholarly journals, books, and digital collections across 12 archive nodes with no user access unless a trigger event occurs.
• Triggered Content Service Service that releases preserved content into permanent Creative Commons Open Access when a trigger event occurs (e.g., publisher ceases operations or a title is discontinued), ensuring the scholarly record stays openly available.
• CLOCKSS Diamond OA Journal Preservation Pilot Pilot program offering free preservation of library- and scholar-led Diamond Open Access journals in the CLOCKSS archive, with built-in connectors to OJS (Open Journal Systems) and OMP (Open Monograph Press) for content transfer.
• Global LOCKSS Network Distributed preservation network delivered through CLOCKSS, offering institutions an alternative to commercial cloud preservation services with community-led stewardship.

Quantifiable outcome

• 82 journals triggered to open access, freely available to everyone permanently
• +1 more outcomes

Named customers5 records

Segments3 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration5 records

Feature6 records

Partnerships

Seven partnerships are on record, tiered flagship, core and minor.

• National Library of the Netherlands (KB)flagshipStrategic or Co-development Partner · 1 January 2026KB conceived and led the formation of GRIN (Global Resilient Information Network), bringing together international leaders from national libraries, cultural institutions, and digital preservation organizations including CLOCKSS. CLOCKSS actively participates in this collaborative initiative for shared digital stewardship of cultural and knowledge assets.
• LOCKSScoreTechnology or IntegrationLOCKSS provides the foundational technology platform for CLOCKSS, including the award-winning distributed preservation software. LOCKSS team operates the CLOCKSS Archive under contract to the CLOCKSS Board. LOCKSS 2.0 development includes REST API implementation for enhanced interoperability and diversified content deposit pipelines.
• Center for Research Libraries (CRL)coreImplementation/ SI/ Consulting PartnerCRL conducts rigorous independent audits for CLOCKSS accreditation, including TRAC certification based on ISO 16363 standards. CRL serves as the certifying body validating CLOCKSS's trustworthiness as a digital repository.
• University of Edinburgh - Edinburgh DiamondcoreStrategic or Co-development PartnerEdinburgh Diamond (University of Edinburgh's library publishing partner) participates in CLOCKSS's Diamond OA pilot program. The university hosts one of 12 CLOCKSS archival nodes, and its Director of Library and University Collections serves as Co-Chair of the CLOCKSS Board of Directors.
• All Able LtdminorImplementation/ SI/ Consulting PartnerAll Able Ltd conducted comprehensive accessibility audits of the CLOCKSS website using assistive technologies, screen readers, speech recognition software, keyboard navigation testing, and color contrast analysis. Audit findings have led to implemented improvements.
• Digital Preservation CoalitioncoreStrategic or Co-development PartnerCLOCKSS participates in DPC initiatives including the Carbon Footprint Toolkit development, where Alicia Wise (CLOCKSS Executive Director) chairs the DPC Carbon Footprint Task Force. DPC hosted discussions on environmental impact and digital preservation.
• White Rose University PresscoreStrategic or Co-development PartnerWhite Rose University Press published the Journal of African Cultural Heritage Studies, which has been preserved and triggered for open access through CLOCKSS, making all volumes permanently available under Creative Commons licensing.

Scale indicators8 records

Recent moves5 records

Expansion highlights6 records

Broad incumbents

• JSTOR: Large-scale scholarly content archive providing long-term access to academic journals, books, and primary sources. Overlaps with CLOCKSS's preservation and access-continuity mission but is broader (access platform) and operates commercially with library subscription funding.
• Internet Archive: Large-scale nonprofit digital library archiving web pages, books, audio, video, and software. Overlaps with CLOCKSS on long-term preservation of digital content but operates a much broader scope and open-access-first mandate versus CLOCKSS's dark-archive scholarly focus.
• AWS S3 Glacier / Amazon Glacier: Major commercial cloud archival storage service frequently used as the underlying preservation substrate by libraries and institutions. A broad incumbent in the digital preservation infrastructure layer rather than a community-led dark archive like CLOCKSS.

Direct peers

• HathiTrust: Nonprofit digital preservation repository founded by academic and research libraries to archive and share scholarly content. Directly comparable to CLOCKSS in mission, library-led governance, and preservation of digitized and born-digital scholarly materials.
• Chronopolis: Digital preservation network providing distributed, replicated dark archiving services to research and cultural heritage institutions. Comparable distributed-architecture model and community-funded approach to long-term scholarly content preservation.
• Portico: Community-supported preservation service for academic journals, books, and select other scholarly content. Closely comparable dark-archive model with library and publisher funding, trigger-based access, and similar participant categories to CLOCKSS.

Others

• Digital Preservation Coalition (DPC): International advocacy and membership coalition advancing digital preservation across sectors. A peer/ecosystem participant rather than direct competitor—CLOCKSS is a DPC member and Wise chairs DPC's Carbon Footprint Task Force.

Emerging players

• LOCKSS Alliance / LOCKSS Program: Stanford-based community and technology program built on LOCKSS software that powers CLOCKSS. Operates parallel LOCKSS networks (e.g., Global LOCKSS Network) for institutional preservation and is a close technology and governance peer with overlapping community membership.
• APTrust (Academic Preservation Trust): Consortium of universities and research institutions offering replicated dark preservation services for academic digital content. Directly comparable nonprofit/community model serving the academic preservation segment where CLOCKSS operates.

Regional players

• Koninklijke Bibliotheek (KB) / National Library of the Netherlands: National library and major digital preservation actor that initiated the GRIN network and operates large-scale preservation infrastructure. A strategic partner and regional peer, with overlapping digital stewardship mandate though focused on national/legal deposit content.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks5 records

Key highlights6 records

Customer concentration

• Xx.com/clockssarchive

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about CLOCKSS