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Product Highlights

CLOCKSS (Controlled LOCKSS) is a not for profit joint venture between the world's leading scholarly publishers and research libraries whose mission is to build a sustainable, geographically distributed dark archive with which to ensure the long-term survival of web-based scholarly publications for the benefit of the greater global research community.

Built on low cost, open source LOCKSS™ technology, the CLOCKSS archive comprises geographically dispersed nodes located at 15 major research libraries, into which e-content is ingested and preserved. Content stored in CLOCKSS cannot be accessed until a trigger event is deemed to have occurred and the CLOCKSS board votes to "light up" the affected titles and restore access to them again. Within the past year, CLOCKSS experienced three trigger events and responded by releasing the triggered content, making it free not only to CLOCKSS participants, or to current or former subscribers to that licensed content, but free to everyone with access to the Internet.


There are no trials available for CLOCKSS. However, you can see the triggered content.

Minitex Pricing

Libraries participating in CLOCKSS pay an annual participation fee, which is based on a library's materials budget. A consortial discount may be available, depending on the number of subscribing libraries.

License Agreements (Terms & Conditions)

CLOCKSS does not have any formal agreement for the participating libraries to sign.

How to Order or Renew

Contact CLOCKSS, and CLOCKSS will send an invoice for the agreed upon annual contribution. Subscriptions run from January through December, so annual fees are prorated to add new libraries to that schedule.

Technical Support

You may contact CLOCKSS at:


There are no usage statistics available at this time.

Contact Information

Minitex Contact

Cooperative Purchasing & Electronic Resources Services (CPERS)
Wilson Library, Room 60
309 19th Avenue South
Minneapolis, MN 55455
Toll Free: 800-462-5348
Phone: 612-624-4002
Fax: 612-625-3569

Vendor Contact

Bob Zuzak
Executive Vice President, Participation Services
Phone: 614-975-8434


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