Security features- protect PDF files by a password.Article threads – articles that span multiple columns or pages are linked so that readers can easily navigate the text.External links – embed a link to external documents or URLs. ![]() Matching software: Adobe Acrobat 1.0 PDF 1.1 PDF 1.0Īvailability: November 1992 (announcement)/June 1993 (first software) The older software will ignore the newer features and may not be able to display page elements that use them. Backward compatibility is also pretty good: a recent PDF 1.7 file can be opened by Acrobat 4. Overall the PDF file format is remarkably flexible: obviously it is forward compatible, allowing you to open an old PDF 1.0 file in the latest version of the Adobe Reader. A more elaborate overview of the history of PDF can be found here. For each PDF version, the new features are listed. ![]() This page lists all the major releases, starting from PDF 1.0 which was released in 1993. Over the years the Portable Document Format has evolved enormously.
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