Edited sentence: , paper, by digitizing.A distinction is often made between content that was created in a digital format, known as born-digital, and information that has been converted from a physical medium, e.Archives differ from libraries in several ways.Containing primary sources of information (typically letters and papers directly produced by an individual or organization) rather than the secondary sources found in a library (books, etc);.For example, American Memory is a digital library within the Library of Congress.Having their contents organized in groups rather than individual items;.Having unique contents.Institutional, truly free, and corporate repositories are sometimes referred to as digital libraries.Many academic libraries are actively involved in building institutional repositories of the institution's books, papers, theses, and other works which can be digitized or were 'born digital'.Many of the best known digital libraries are older than the web including Project Perseus,  Project Gutenberg, and ibiblio.Many of these repositories are made available to the general public with few restrictions, in accordance with the goals of open access, in contrast to the publication of research in commercial journals, where the publishers often limit access rights.Nevertheless, as a result of the development of the internet and its search potential, digital libraries such as the European Library and the Library of Congress are now developing in a Web-based environment.Public, school and college libraries are also able to develop digital download websites, featuring eBooks, audiobooks, music and video.Some important digital libraries also serve as long term archives, for example, the ePrint arXiv, and the Internet Archive.The Oxford Text Archive is generally considered to be the oldest digital archive of academic physical primary source materials.The technology used to create digital libraries has been even more revolutionary for archives since it breaks down the second and third of these general rules.The term  digital library is diffuse enough to be applied to a wide range of collections and organizations, but, to be considered a digital library, an online collection of information must be managed by and made accessible to a community of users.The term hybrid library is sometimes used for libraries that have both physical collections and digital collections.Thus, some web sites can be considered digital libraries, but far from all.Traditionally, archives were defined as: