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April 15, 2008
Issue No. 77

Table of Contents

CLOCKSS Works

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by Amy Kohrman

Researchers increasingly access journal articles online, but the real possibility exists that, due to natural disaster or human/computing failure, digital content might not always be available. Libraries and publishers have joined forces in an initiative called CLOCKSS (Controlled Lots of Copies keep Stuff Safe), providing leadership and the supporting technology, to ensure reliable, long-term access to scholarly e-content.

CLOCKSS is a trusted and secure dark archive, preserving scholarly journal content from the world's leading publishers.

First Journal Available

The moment has arrived to see how CLOCKSS works. The Web-published content of the journal Graft: Organ and Cell Transplantation (SAGE Publications) has been exported from the CLOCKSS archive, and is now available to the world from two CLOCKSS hosting platforms at universities in Europe and the US. Released under a Creative Commons license, this content is free to researchers, students and the general public, without need of any subscription.

How CLOCKSS Works

CLOCKSS is a trusted and secure dark archive, preserving scholarly journal content from the world's leading publishers. The CLOCKSS system is based on geographically-dispersed nodes located at major research libraries into which e-journal content from publishers is routinely ingested. Archived copies remain "dark" (hidden, secure and unavailable for use), until a trigger event and the CLOCKSS Board votes to "light up" the content and restore access to it again via a hosting platform.

At present, there are seven archive nodes and two hosting platforms. These numbers are expected to double in order to achieve added security from global coverage. SAGE Publications is one of 11 premier publishers (together accounting for about 60 percent of e-journal content) participating in the CLOCKSS Pilot and serving on the CLOCKSS Board.

When SAGE announced that it was discontinuing Graft, this became the first real-world test for the CLOCKSS system and its procedures: the CLOCKSS Board, comprising both publishers and library organizations, determined that a trigger event had occurred; instruction was given for Graft content to be copied from archive nodes in the CLOCKSS network to the designated hosting platforms; and 18 issues of Graft became available to the world. To read Graft, please click here.

Screenshot of Graft Public Copies page on the CLOCKSS web site

Universities Host CLOCKSS

Stanford University, where the underlying LOCKSS software was developed, and the University of Edinburgh are among the seven participants on the library side, acting as stewards for the CLOCKSS system. The two universities have also been designated as CLOCKSS hosting platforms in order to demonstrate, through the release of content, how CLOCKSS works, with EDINA, the UK national data centre at Edinburgh, playing that role for Europe, and Stanford University Libraries doing so for the US. Both serve as points of worldwide access, free to all, without any prior subscription, fee, or registration.

More Information

CLOCKSS is transitioning from a Pilot Program to an organization for the long-term, building on the technology and findings of LOCKSS (for Lots of Copies Keep Stuff Safe).

Participating Libraries in the CLOCKSS Pilot:_Indiana University, New York Public Library, OCLC, Rice University, Stanford University, University of Edinburgh, and University of Virginia.

Participating Publishers in the CLOCKSS Pilot:_American Chemical Society, American Medical Association, American Physiological Society, Elsevier, IOP Publishing, Nature Publishing Group, Oxford University Press, SAGE Publications, Springer, Taylor & Francis, and Wiley-Blackwell.