PKP has developed a Private LOCKSS Network (PLN) to digitally preserve OJS journals. The LOCKSS program offers decentralized and distributed preservation, seamless perpetual access, and preservation of the authentic original version of the content. The PKP PLN will ensure that journals that are not part of the Global LOCKSS Network, which primarily preserves content from larger publishers and vendors, or an existing PLN, which preserve small numbers of OJS journals hosted by member libraries, can be preserved using the LOCKSS program. For additional details about the PKP PLN, see the high level overview or the wiki page.

The PKP PLN is transitioning from a year-long pilot phase, which included the participation of the University of Victoria, University of Pittsburgh, University of Alberta, University of British Columbia, Indiana University, and Simon Fraser University. The Network itself is not yet open to the wider OJS user community, but will be available after the release of OJS 2.4.7.


The PKP PLN will:

  • provide preservation services for any OJS journal that has published at least one article and has an ISSN
  • allow OJS journal managers to register their journals for inclusion in the PLN by simply enabling a plugin in their OJS instance and agreeing to the terms of the Preservation Agreement
  • on registration of a journal, automatically determine if the registered journal meets the minimum inclusion requirements
  • preserve the raw journal content as generated by OJS’s existing export tools
  • automatically harvest new content from registered journals and add the content to the PLN, eliminating manual staff intervention at PLN member sites
  • provide access to preserved content after a “trigger event”

End-user access to journals in the PKP PLN

The PKP PLN is a dark archive. End users will not have access to the preserved content until after a “trigger event.” After a trigger event, PKP staff will approve the importing of the preserved content into one or more OJS instances hosted by PKP member institutions. Once loaded into these host OJS instances, the content will be openly accessible.

Trigger events in the PKP PLN

Preserved content in the PKP PLN is only made available to users after a trigger event, at which time the content will be made available to the reading public. The PKP PLN defines two types of trigger events.

  1. Explicit notification by OJS Journal Manager
  2. Cessation of deposits into the PLN (after a period of inactivity)

The PKP-PLN will employ automated techniques to detect a potential trigger event and contact the journal to confirm their publication status.

Preservation agreement

Journal managers who would like their journal to be included in the PKP PLN will need to accept the terms of the Preservation Agreement, via the LOCKSS OJS plugin. This agreement will describe what is being preserved, the nature of the PKP’s commitment to preserve their journal, PKP’s right to preserve the journal, that the content will be made accessible after a trigger event (as described above), and how they should contact the PKP to initiate a trigger event.


A new LOCKSS OJS plugin is included with OJS 2.4.7 and above. The older LOCKSS OJS plugin that generates a LOCKSS manifest and permission statement will continue to work for those journals that are part of existing PLNs or the LOCKSS GLN, but will not work within the proposed PKP PLN. Journal managers will opt into the PKP PLN by activating the new plugin. (Additional LOCKSS-based solutions for OJS content are described on the LOCKSS website.)

PKP PLN members

PKP members who have confirmed participation in the proposed PLN are:

  • University of Alberta
  • University of British Columbia
  • Indiana University
  • University of Pittsburgh
  • University of Victoria, and
  • Simon Fraser University

In addition, PKP plans to work with PLNs around the world to provide further redundancy and geographical distribution within the PKP PLN.

PKP PLN Advisory Panel Members

  • Lars Bjornshauge, Directory of Open Access Journals (DOAJ)
  • Sioux Cumming, International Network for the Availability of Scientific Publications (INASP)
  • Geoff Harder, University of Alberta Libraries
  • Sarah Lippincott, Library Publishing Coalition (LPC)
  • Alex Mendonça, SciELO
  • Susan Murray, African Journals Online (AJOL)
  • Victoria Reich, LOCKSS
  • Heather Joseph, SPARC
  • Dwayne K. Buttler, J.D., University of Louisville


All journals can join the PLN provided they meet the following criteria:

  • The journal must be running OJS 2.4.7 or higher
  • The journal must have an ISSN
  • The journal must have published at least one article

Your journal’s content will be automatically added to the PLN. You will not need to take any further action. The only exception is that if the terms of use that you agreed to change, you will be asked to agree to the new terms. In this situation, OJS will provide a notification to visit the PKP PLN plugin’s administration page so you can agree to the new terms.

(Note: If you join the PLN shortly after the initial pilot phase was completed in September 2015, your content may not appear in the Network immediately. This is normal, as we work behind the scenes to complete final testing of our infrastructure, and you will be added in due time.)


For any support issues, please post on our PKP Community Forum.