The book "Long-Term Preservation of Digital Documents" by Uwe M. Borghoff and Lothar Schmitz offers a comprehensive analysis of the challenges and techniques for the long-term storage and use of digital data. In an era where the transition from physical to digital media is rapidly advancing, the ability to preserve information for over 50 years is crucial. The authors explain various markup and document description languages such as TIFF, PDF, HTML, and XML, and introduce important techniques like migration and emulation. Additionally, the OAIS (Open Archival Information System) reference model is presented, serving as a framework for the archiving of digital information. The book is aimed at librarians, computer scientists, and information managers who are concerned with preserving our digital heritage and the associated social and methodological challenges.