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PDF was standardized as ISO 32000 in 2008.<ref>{{cite web |url = http://wwwimages.adobe.com/www.adobe.com/content/dam/acom/en/devnet/pdf/pdfs/PDF32000_2008.pdf |title = ISO 32000-1:2008 |archive-url=https://web.archive.org/web/20180726064724/http://wwwimages.adobe.com/www.adobe.com/content/dam/acom/en/devnet/pdf/pdfs/PDF32000_2008.pdf | archive-date=July 26, 2018|url-status=dead}}</ref> The last edition as ISO 32000-2:2020 was published in December 2020.
PDF files may contain a variety of content besides flat text and graphics including logical structuring elements, interactive elements such as annotations and form-fields, layers, [[rich media]] (including video content), three-dimensional objects using [[U3D]] or [[PRC (file format)|PRC]], and various other [[File format|data formats]]. The PDF specification also provides for encryption and [[digital signature]]s, file attachments, and [[metadata]] to enable [[workflow]]s requiring these features.<ref>{{Cite web |date=2024-04-21 |title=PDF Kitap İndir 2024 {{!}} Ücretsiz E Kitap - Çizgi Romanlar |url=https://1ekitapindir.blogspot.com/ |access-date=2024-04-22 |website=PDF Kitap İndir 2024 {{!}} Ücretsiz E Kitap - Çizgi Romanlar}}</ref>
== History ==
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