Portable Document Format: Forskelle mellem versioner
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* [http://www.prepressure.com/pdf/history/history01.htm History of PDF at prepressure.com]
* [http://www.planetpdf.com/enterprise/article.asp?ContentID=6519 The Camelot Paper] — the paper in which John Warnock outlined the project that created PDF
* [http://www.ascertia.com/Products/PDF-Sign-Seal.aspx PDF Sign&Seal] — Designed to make PDF signing easy!
[[Kategori:Åbne filformater]]
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