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1) "Pdf" -- As to pdf encryption Portable Document Format (PDF) Adobe Acrobat Reader displaying a PDF in Debian GNU/Linux File extension: .pdf MIME type: application/pdf Type code: 'PDF ' (including a single space) Uniform Type Identifier: com.adobe.pdf Magic: %PDF Developed by: Adobe Systems Portable Document Format (PDF), sometimes mistaken for "Printable Document Format", is an open file format created by Adobe Systems in 1993 and is now being prepared for submission as an ISO standard[1]. It is used for representing two-dimensional documents in a device independent and resolution independent fixed-layout document format. Each PDF file encapsulates a complete description of a 2D document (and, with the advent of Acrobat 3D, embedded 3D documents) that includes the text, fonts, images, and 2D vector graphics that compose the document. PDF files do not encode information that is specific to the application software, hardware, or operating system used to create or view the document. This feature ensures that a valid PDF will render exactly the same regardless of its origin or destination (but depending on font availability when fonts are not encapsulated in the file). PDF files are most appropriately used to encode the exact look of a document in a device-independent way. While PDF can describe very simple one page documents, it may also be used for many pages, complex documents that use a variety of fonts, graphics, colors, and image..." 2) "Encryption" -- As to pdf encryption en·crypt Pronunciation: in-'kript, en- Function: transitive verb Etymology: en- + crypt- (as in cryptogram) 1 : ENCIPHER 2 : ENCODE 1a - en·cryp·tion /-'krip-sh&n/ noun Pronunciation Symbols 1 Ciphers 1.1 Etymology of "cipher" 2 Ciphers versus codes 3 Types of cipher 4 Key size and vulnerability 5 References 6 See also 7 External links In cryptography, encryption is the process of obscuring information to make it unreadable without special knowledge, sometimes referred to as scrambling. Encryption has been used to protect communications for centuries, but only organizations and individuals with an extraordinary need for secrecy had made use of it. In the mid-1970s, strong encryption emerged from the sole preserve of secretive government agencies into the public domain, and is now used in protecting widely-used systems, such as Internet e-commerce, mobile telephone networks and bank automatic teller machines. Encryption can be used to ensure secrecy, but other techniques are still needed to make communications secure, particularly to verify the integrity and authenticity of a message; for example, a message authentication code (MAC) or digital signatures. Another consideration is protection against traffic analysis. Encryption or software code obfuscation is also used in software copy protection against reverse engineering, unauthorized application analysis, cracks and software piracy used in different encryption or obfuscating software. In cryptography, a cipher (or cypher) is an algorithm for performing encryption and decryption — a series of well-defined steps that can be followed as a procedure. An alternative term is encipherment. In most cases, that procedure is varied depending on a key which changes the detailed operation of the algorithm. In non-technical usage, a "cipher" is..." 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