The Royal Library acquires Danish books through legal deposit. The holdings include an almost complete collection of all Danish printed books back from 1482. In 2006, legal deposit was extended to electronic publications and now the library harvests four electronic copies of the Danish Internet each year. Danish books printed before 1900 are digitized on demand and made freely available to the public.As the National library, RDL has vast collections of digital material (Danish net archive, digitized radio and TV and newspapers etc.) which are relevant for scholars in many fields.The library also holds a large and significant collection of old foreign scholarly and scientific literature, including precious books of high value and of importance for book history, including a rare copy of the Gutenberg Bible.