The Digital Preservation Network (DPN) serves as a preservation backbone for digital information of interest to the academy. DPN Depositors add digital assets to the Network by working with an individual DPN Node to ingest and preserve content. This content is then replicated to other DPN Nodes, which together form a heterogeneous network of secure, trustworthy digital archives, each operated under diverse geographical, organizational, financial, and technical regimes. Robust (bit) auditing and repair functions ensure the fixity of content over time. Intellectual property agreements ensure the succession of rights to use of the content through the Network in the event of dissolution or divestment of content by the original depositor and/or archive.

By illustration, a typical flow of Primary Interactions in DPN would be:

  1. Depositors will work directly with an individual DPN Node to negotiate contracts, determine service levels, and deposit materials into DPN via the First Node (the content’s point of entry into DPN). Service levels and contracts will reflect “standard” DPN services; they may also reflect the First Node’s unique offerings in terms of access, hosting or other services.
  2. DPN will replicate the content from the First Node to other DPN Nodes (known in this case as Replicating Nodes). Content in Replicating Nodes will be held “dark”, and inaccessible except for preservation actions.
  3. DPN bit auditing and repair functions will continuously monitor the integrity of copies across all nodes, and will detect and repair corruption, errors, and data loss on an ongoing basis.
  4. DPN First Nodes will have the ability to restore copies of content from Replicating Nodes in the event the First Node’s copies are lost or corrupted. This shall include:
    1. Restoration of individual content.
    2. Restoration of sets of content.
    3. Restoration of the entire contents of the First Node.
  5. DPN shall redistribute preserved content as Nodes enter and leave the Network, ensuring continuity of preservation services over time.
  6. DPN shall preserve and manage sufficient identity, administrative (including legal and contractual), technical, and descriptive metadata to enable the future brightening of content after succession, independent of any contributions or participation by the First Node or original Depositor.

DPN therefore preserves digital information for the Academy by…

  1. Establishing a network of heterogeneous, interoperable, and trustworthy digital repositories (DPN Nodes) that provide preservation services under a common technical, service, and legal framework. DPN nodes will operate in a secure manner to protect the integrity of the processing, transport, and storage of content that DPN holds. DPN will develop a threat model and monitor for threats on a continuous basis.
  2. Providing facilities to ingest content from existing repositories (First Nodes) with minimal repackaging effort, and replicating this ingested content to multiple, geographically and technically diverse, Replicating Nodes.
  3. Enabling the restoration of preserved content to a First Node (or a Replicating Node) in the event of local data corruption, loss, or disaster.
  4. Ensuring the ongoing preservation of digital information for a DPN Depositor in the event of the dissolution or divestment of a First Node.
  5. Providing the option to brighten content preserved in the Network for long-term re-use by the Academy, if the content's original Depositor and Archive (First Node) has discontinued operations or divested the information.
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