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A PDF file may be encrypted, for security, in which case a password is needed to view or edit the contents. PDF 2.0 defines 256-bit AES encryption as the standard for PDF 2.0 files. The PDF Reference also defines ways that third parties can define their own encryption systems for PDF.
The ISO 13346/ECMA-167 standard was designed in conjunction to the ISO 13490 standard. This new format addresses most of the shortcomings of ISO 9660, and a subset of it evolved into the Universal Disk Format (UDF), which was adopted for DVDs. The volume descriptor table retains the ISO9660 layout, but the identifier has been updated. [44] [45]
PDF is a standard for encoding documents in an "as printed" form that is portable between systems. However, the suitability of a PDF file for archival preservation depends on options chosen when the PDF is created: most notably, whether to embed the necessary fonts for rendering the document; whether to use encryption; and whether to preserve additional information from the original document ...
An optical disc image (or ISO image, from the ISO 9660 file system used with CD-ROM media) is a disk image that contains everything that would be written to an optical disc, disk sector by disc sector, including the optical disc file system. [3] ISO images contain the binary image of an optical media file system (usually ISO 9660 and its ...
HTML is the most used and open international standard and it is also used as document file format. It has also become ISO/IEC standard (ISO 15445:2000). The default binary file format used by Microsoft Word has become widespread de facto standard for office documents, but it is a proprietary format and is not always fully supported by other ...
DTD – Document Type Definition (standard), MUST be public and free.html, .htm – HTML HyperText Markup Language.xhtml, .xht – XHTML eXtensible HyperText Markup Language.mht, .mhtml – MHTML Archived HTML, store all data on one web page (text, images, etc.) in one big file.maff – MAF web archive based on ZIP; Dynamically generated
A disk image is a snapshot of a storage device's structure and data typically stored in one or more computer files on another storage device. [1] [2]Traditionally, disk images were bit-by-bit copies of every sector on a hard disk often created for digital forensic purposes, but it is now common to only copy allocated data to reduce storage space.
PDF: an ISO-standardized file format for reliable document exchange across platforms; The following formats are open (royalty-free with a one-time fee on the standard): Office Open XML : the ECMA version is downloadable for no charge, but the newer ISO versions require a fee;