Digital preservation is an evolving field; therefore, OAK Trust (Digital Repository)'s long-term access strategies are shaped by the Open Archival Information System (OAIS) reference model (ISO 14721:2003) and informed by relevant international standards and emerging best practices.

  1. OAK Trust (Digital Repository) provides storage and long-term access to submitted works, the metadata, and the deposit license agreement.  The Libraries will retain the data on disk with a tape backup.
  2. Prudent efforts will be employed to preserve work in any digital format submitted to OAK Trust (Digital Repository). See Recommended File Formats for a list of preferred formats. For files in formats other than those listed in Recommended File Formats, a derivative file in a more stable format should be created by the submitter. In such cases, the original file as well as the derivative will be preserved, along with associated descriptive and administrative metadata for both files.
  3. The Repository provides basic preservation of the files (bitstreams) and associated metadata as-is with no active effort made to monitor the format and associated risks or to normalize, transform or migrate the file to another format. Further practical measures to preserve as much functionality (“look and feel”) of the original as possible will be employed as resources permit.
  4. The Libraries will provide periodic data refreshment to new storage media, and will provide fixity checks using proven checksum methods.
  5. For long-term, preservation storage, the Texas Digital Library (TDL) PresNet system is available.  PresNet is designed to provide long-term storage of digital information at geographically distributed storage nodes.  The Office of Scholarly Communication also provides this service.
  6. All works submitted to OAK Trust (Digital Repository) are assigned a web-addressable persistent identifier.