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OpenXPS – open standard for a page description language and a fixed-document format; PDF started as a proprietary standard. PDF version 1.7 was standardized as ISO 32000-1 [8] in 2008. However, some technologies indispensable for the full implementation of ISO 32000-1 are defined only by Adobe and remain proprietary (e.g. Adobe XML Forms ...
The standard security provided by PDF consists of two different methods and two different passwords: a user password, which encrypts the file and prevents opening, and an owner password, which specifies operations that should be restricted even when the document is decrypted, which can include modifying, printing, or copying text and graphics ...
PDF/A is an ISO-standardized version of the PDF specialized for use in the archiving and long-term preservation of electronic documents. PDF/A-3 allows embedding of other file formats, including XML, into PDF/A conforming documents, thus potentially providing the best of both human- and machine-readability. The W3C's XSL-FO (XSL Formatting ...
Mac OS X has built-in PDF support, both for creation as part of the printing system and for display using the built-in Preview application. Older PDF files are supported by almost all modern e-book readers, tablets and smartphones. Newer PDF files may not display properly on older e-readers, may not open, or may crash them.
Controlled vocabulary terms can accurately describe what a given document is actually about, even if the terms themselves do not occur within the document's text. Well known subject heading systems include the Library of Congress system , Medical Subject Headings (MeSH) created by the United States National Library of Medicine , and Sears .
One famous example of this was the Ultra secret, where documents were marked "Top Secret Ultra": "Top Secret" marked its security level, and the "Ultra" keyword further restricted its readership to only those cleared to read "Ultra" documents. [2]
Something happened, and you need money. Urgently. You look at your savings account. Tumbleweeds roll across the place your emergency fund should occupy.
Documents containing Adobe extended features still carry the PDF base version number 1.7 but also contain an indication of which extension was followed during document creation. [21] PDF documents conforming to ISO 32000-2 carry the PDF version number 2.0, and are known to developers as "PDF 2.0 documents".