The high level of success enjoyed by the sites' operators has been possible because the close interconnection of a sharehoster service and a link library enables the illegal uploading of the copyrighted works that are made immediately accessible to the public without limitations. The true nature of the sites has been disguised by the legitimate-sounding domain name ("library.nu") and the overall appearance of the sites.
Taking action against their massive infringement has been challenging because the operators have also gone to great lengths to conceal their identities, including name changes, false registrations, server relocations, and the use of sophisticated anti-detection systems. They persisted in offering infringed content despite previous attempts to stop their illegal activities until this action
After conducting intensive investigations, the publishers were able to identify the site's operators and provide evidence for their connection to the court. As a result, the publishers made extensive claims before the /Landgericht/ (regional court) of Munich I. A total of 17 interim injunctions were obtained and served, and the sites have shut down.
The international alliance of publishers is coordinated by the Börsenverein des Deutschen Buchhandels, the International Publishers Association and the law firm Lausen Rechtsanwälte, lead managed by lawyer Dr. Ursula Feindor-Schmidt. The publishing houses involved are Cambridge University Press, Georg Thieme, Harper Collins, Hogrefe, Macmillan, Cengage Learning, Elsevier, John Wiley & Sons Inc., The McGraw-Hill Companies, Pearson Education Ltd., Pearson Education Inc., Oxford University Press, Springer, Taylor & Francis, C.H. Beck as well as Walter de Gruyter. The course of action is supported by the Association of American Publishers, Nederlands Uitgeversverbond NUV, Associazione Italiana Editori, and the STM Group.