CLOCKSS Announces its TRAC Re-certification

Today the CLOCKSS Archive announced its TRAC re-certification by the Center for Research Libraries, based on an updated Trusted Repository Archiving Checklist audit.

With grades on a scale of 1 (lowest) to 5 (highest), CLOCKSS maintained its score of 5 for Technologies, Technical Infrastructure, Security. CLOCKSS improved its score from 4 to 5 for Organizational Infrastructure. The score for Digital Object Management remains at 4.

“We are pleased with the outcome of the TRAC re-certification process, and we thank CRL for its diligence in conducting a thorough review. We are proud to have the highest possible scores for Technology and for Organizational Infrastructure, and we will be working to achieve a top score for Digital Object Management,” said Craig Van Dyck, Executive Director of the CLOCKSS Archive.

Added Bernard Reilly, President of CRL, “Our recent review of CLOCKSS’ operations convinced us that the preservation service has continued to grow in capacity and reliability since CRL’s original audit in 2014.”

The re-certification process occurs every three years, after the initial certification. CLOCKSS is the first TRAC-certified archive to complete the CRL re-certification audit.

A collaboration of the world’s leading academic publishers and research libraries, CLOCKSS ( provides a sustainable dark archive to ensure the long-term survival of Web-based scholarly content.  CLOCKSS (Controlled LOCKSS) employs a unique approach to archiving (Lots of Copies Keep Stuff Safe) that was initiated by Stanford Libraries in 1999. Digital content is stored in the CLOCKSS archive with no user access unless a “trigger” event occurs. The LOCKSS technology regularly checks the validity of the stored data and preserves it for the long term.

CLOCKSS operates 12 archive nodes at leading academic institutions worldwide, preserving the authoritative versions of over 30 million digital journal articles, 25,000 serials, and 75,000 book titles, and a growing collection of supplementary materials and metadata information. So far 53 titles have been triggered and made available from the CLOCKSS Archive via open access. A strong and secure organization, CLOCKSS is supported by 300 supporting libraries and 260 participating publishers.