Trusted Digital Repository (TDR)
A digital archive whose mission, practices, and infrastructure are demonstrably reliable for preserving and providing long-term access to digital records, often assessed against the OAIS model.
A trusted digital repository (TDR) is a digital archive that can be demonstrably relied upon to preserve digital content and provide access to it over the long term. Trust here isn’t a marketing claim — it’s something assessed against recognized criteria covering the repository’s organizational commitment, financial sustainability, procedures, and technical infrastructure.
TDR concepts build on the OAIS reference model, and repositories can be evaluated or certified against standards and audit frameworks (such as ISO 16363 and related self-assessment tools). A trustworthy repository typically demonstrates reliable ingest, storage, fixity checking, format migration, preservation metadata (PREMIS), succession planning, and access. The point of the concept is accountability: an organization entrusting records to a repository — for decades — needs evidence that the repository will actually keep them authentic, usable, and available.