PKP is developing 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 currently in a pilot phase. Selected journals hosted at the University of Victoria, University of Pittsburgh, University of Alberta, University of British Columbia, Indiana University, and Simon Fraser University are participating. If your journal is not participating in the pilot, you can can still enable the PKP PLN plugin included in OJS 2.4.5 and agree to the terms of use that the plugin provides. For more information, see below under “Development timeline”


The PKP PLN will:

  • provide preservation services for any OJS journal that has published one year’s worth of content 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 a small number of terms in 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” has been communicated to PKP by the journal manager

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 available to the public under a suitable Open Access license (dependant on the copyright and licensing policies an OJS journal had in effect at the time the content was added to the PLN).

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 that was published under an open access license is imported into one or more OJS instances. 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 two year period of inactivity)

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 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, the type of license the content will be made available under after a trigger event (as described above), and how they should contact the PKP to initiate a trigger event.

OJS plugin

A new OJS plugin will be included with OJS 2.4.5. The existing 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 is working with the SAFE PLN in Europe ( led by the Université libre de Bruxelles (ULB)  to host a LOCKSS server there, and also with the Brazilian national PLN managed by the Instituto Brasileiro de Informação em Ciência e Tecnologia (IBICT),  to provide additional 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)
  • Sarah Lippincott, Library Publishing Coalition (LPC)
  • Alex Mendonça, SciELO
  • Susan Murray, African Journals Online (AJOL)
  • Victoria Reich, LOCKSS
  • Heather Joseph, SPARC

Development timeline

When the pilot is completed by Fall 2015, all journals using Open Journal Systems will be able to join the PLN provided they meet the following criteria:

  • The journal must be running the most current version of OJS
  • The journal must have an ISSN
  • The journal must have published at least one year’s worth of content

If your journal is not participating in the pilot, you can can still enable the PKP PLN plugin included in OJS 2.4.5 and agree to the terms of use that the plugin provides. After the end of the pilot, your journal’s content will automatically be 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.