Fedora (or Flexible Extensible Digital Object Repository Architecture) is a digital asset management (DAM) content repository architecture upon which institutional repositories, digital archives, and digital library systems might be built. Fedora is the underlying architecture for a digital repository, and is not a complete management, indexing, discovery, and delivery application. It is a modular architecture built on the principle that interoperability and extensibility are best achieved by the integration of data, interfaces, and mechanisms (i.e., executable programs) as clearly defined modules. History The Fedora Repository open source software is a project supported by the DuraSpace not-for-profit organization. The software has its origins in the Flexible Extensible Digital Object Repository Architecture (i.e., Fedora) which was originally designed and developed by researchers at Cornell University. Fedora is an architecture for storing, managing, and accessing digital content in the form of digital objects inspired by the Kahn and Wilensky Framework. Fedora began as a DARPA and National Science Foundation funded research project at Cornell University's Digital Library Research Group in 1997, where the first reference implementation was written in Java using a CORBA-based distributed object approach. The University of Virginia began experimenting with the Cornell software and later joined with Cornell to establish the Fedora Repository project that re-implemented Fedora as open source software. Since then, several modifications have been made to the architecture, and in late 2005, version 2.1 was released. Fedora defines a set of abstractions for expressing digital objects, asserting relationships among digital objects, and linking "behaviors" (i.e., services) to digital objects. In 2003 Red Hat, Inc. applied for trademark status for the name "Fedora" to be associated with their Linux operating system project. Cornell and UVA formally disputed the request and, as a final settlement, all parties settled on a co-existence agreement that stated that the Cornell-UVA project could use the name when clearly associated with open source software for digital object repository systems and that Red Hat could use the name when it was clearly associated with open source computer operating systems. Technology Fedora provides a general-purpose management layer for digital objects. Object management is based on content models that represent data objects (units of content) or collections of data objects. The objects contain linkages between datastreams (internally managed or external content files), metadata (inline or external), system metadata (including a PID – persistent identifier – which is unique to the repository), and behaviors that are themselves code