#PDF ATTRIBUTES A PDF#
#PDF ATTRIBUTES A ZIP FILE#

PDF/A files may also conform to PDF/UA, the ISO standard for accessible PDF technology. Can PDF/A documents be made 'accessible'?Īccessibility and PDF/A go hand-in-hand. Can bookmarks in a PDF file cause problems in PDF/A?

For access-control purposes, it is necessary to control access to the locations in which the PDF/A files are stored. PDF/A prohibits the use of encryption on the file.

#PDF ATTRIBUTES A ZIP FILE#

ZIP file compression is permitted, and images can be compressed using JPEG compression. PDF/A-3 files may include CAD files as embedded objects. Some color profiles could, in certain cases, lead to a much larger file size, but this is rare and is highly dependent on the particular case. Fonts are embedded in a PDF/A file (which is often also the case in normal PDF files) and more information is stored in the metadata. Are PDF/A files much larger than normal PDFs?Ī PDF/A file might be slightly larger than the original PDF file it was created from (provided they don't use different image resolutions or compression methods). PDF/A prohibits audio and video objects in PDF/A files. Can audio and video be used in PDF/A files? It should be considered, however, that external links will likely become invalid over time. There's no problem with including links in a PDF/A file. In the case of scanned documents, OCR can be used to create searchable text. PDF/A files are generally searchable, unless the file was created from a scanned paper document or image. PDF/A Characteristics How can you best make PDF/A files text searchable? The ISO standard requires that future PDF viewing applications must be backward compatible, so that they are capable of correctly displaying older versions of PDF/A. Long-term archiving Will future developments to the PDF/A standard make current PDF/A versions obsolete? a PDF file can generally conform to both PDF/A and PDF/X, but for maximum compatibility with modern PDF/X files, PDF/A-2 is highly recommended due to its support for transparency and layers. The PDF/A and PDF/X standards are fundamentally compatible i.e. How are PDF/A and PDF/X related to each other? PDF/A allows users to save various metadata (for example the copyright) in the document using Extensible Metadata Platform (XMP) technology. Can PDF/A files contain copyright information? PDF/A is just another file-format, and provides no special protections against data corruption. File Formats How does PDF/A fare with respect to file corruption? PDF/A forbids dynamic content to ensure that the user sees the exact same content both today and for years to come. Unlike normal PDF, PDF/A requires that everything necessary to precisely rendering the document is contained in the PDF/A file, including fonts, colour profiles, images and so on. PDF/A is an ISO-standardized subset of PDF that eliminates certain risks to the future reproducibility of the content. Up to now we've used 'normal' PDF for archiving digital documents. Digital documents should remain in electronic format, giving the user a wide range of additional features such as full-text search, digital signatures, and so on. The ability to replace paper with electronic documents is a primary goal of PDF/A.

Pdf attributes a