From a Wikipedia perspective, digitisation means converting books, photographs, newspapers, manuscripts or other physical/analogue materials into digital files that can be preserved, searched and potentially uploaded or linked through Wikimedia projects; re-licensing means obtaining permission from the copyright holder, or otherwise establishing a suitable free licence such as CC BY-SA, so that copyrighted material can legally be reused, edited and redistributed on Wikipedia/Wikimedia Commons—simply digitising something does not make it freely usable; and Wikidata is Wikimedia’s structured-data repository: instead of merely having information buried in a Wikipedia article, facts about a person, book, place, organisation, etc. are stored as machine-readable items and properties (for example, author, date of birth, publication date, language), allowing information to be shared and queried across different-language Wikipedias and other applications.