There is real challenge to build an institutional repository at the greatest university of Hungary because of its difficult structure and size. It was an urgent demand to create a central system to provide a long-term preservation for the digital materials, situated in different homepages of the university that suffered significant harm, in case of all design changing.

As the purpose of the University Library and Funding and Innovation Center (so called PIK) met, the budget was available from the resource of European Union (TÁMOP-4.2.1-09/1/KMR-2009-00010) tendered by the PIK. Besides the IT Service of ELTE lunched its institutional cloud computing service in 2010 that provide cost effective operation of the main information systems of university (Scholar System, ERP HR, mail service, ALEPH library system, etc), so our new ELTE Digital Institutional Treasury (EDIT: http://edit.elte.hu/) system also located in this “cloud”.

The call for public procurement tender based on the 3^rd edition of the Guide to Institutional Repository Software contributed by Open Society Institute and contained some special requirement by the university, mainly connected to interoperability of the new system with other certain system (Shibboleth authorisation system, Hungarian National Scientific Bibliography, etc.) A DSpace institutional repository system was set up by the tender winner Mongúz Ltd. The structure of the system follows the structure of the university and it can manage by different organizational units. Although this software originally was development for open access sources, in our university it serves rather as an institutional “content cloud” containing special “top secret” materials like non public parts of patents or tenders or intranet files. The first open access source in the repository was the digitized old catalogue of the University Library (http://edit.elte.hu/ulibca/)