As explained by Michael Hart: "In addition, there is 'PrePrints' where we put anything we don't know for sure will qualify as a PG ebook. This gets instant exposure, and was created to help keep things flowing. There are 2,020 ebooks available at PrePrints. The Project Gutenberg Consortia Center (PGCC) has over 75,000 ebooks rendered as PDF files. The difference? These files were prepared by other eLibraries, not Project Gutenberg, and are using our worldwide distribution network to be seen. Thus, counting these 75,000+ along with our over 32,500 other ebooks, has generated a grand total of over 100,000 ebooks." SHRINKING OF PUBLIC DOMAIN Michael Hart created Project Gutenberg in July 1971 to make electronic versions of literary works and disseminate them for free. In 2009, Project Gutenberg has had tens of thousands of downloads every day. As recalled by Michael in January 2009, "I knew [in July 1971] that the future of computing, and the internet, was going to be... 'The Information Age.' That was also the day I said we would be able to carry quite literally the entire Library of Congress in one hand and the system would certainly make it illegal... too much power to leave in the hands of the masses." As defined by Project Gutenberg, "public domain is the set of cultural works that are free of copyright, and belong to everyone equally", i.e. for books, the ones that can be digitized and released on the internet for free. But the task of Project Gutenberg hasn't be made any easier by the increasing restrictions to public domain. In former times, 50% of works belonged to public domain, and could be freely used by everybody. A much tougher legislation was set in place over the centuries, step by step, especially during the 20th century, despite our so-called "information society". In 2100, 99% of works might be governed by copyright, with a meager 1% for public domain. In the "Copyright HowTo" section of its website, Project Gutenberg explains how to confirm the public domain status of books according to U.S. copyright laws. Here is a summary: (a) Works published before 1923 entered the public domain no later than 75 years from the copyright date: all these works belong to public domain; (b) Works published between 1923 and 1977 retain copyright for 95 years: no such works will enter the public domain until 2019; (c) Works created from 1978 on enter the public domain 70 years after the death of the author if the author is a natural person: nothing will enter the public domain until 2049; (d) Works created from 1978 on enter the public domain 95 years after publication or 120 years after creation if the author is a corporate one: nothing will enter the public domain until 2074.