« … At that time, microfilm was the new technology and today, ProQuest offers digital preservation for dissertations and theses too, through its Digital Archiving and Access Program (DAAP).
The premise is straightforward. Each paper-based dissertation and thesis submitted by an institution is digitized and two copies are produced in microfilm, and a further digital copy is produced in PDF format. The institution receives a copy of both the microfilm and PDF files in order to provide access to their own works in perpetuity (…) »
Source > proquest.com, 17 juin 2014