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Where text is redacted, in Portable Document (PDF) or word processor formats, by overlaying graphical elements (usually black rectangles) over text, the original text remains in the file and can be uncovered by simply deleting the overlaying graphics.
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 ...
Portable Document Format (PDF), standardized as ISO 32000, is a file format developed by Adobe in 1992 to present documents, including text formatting and images, in a manner independent of application software, hardware, and operating systems.
Censor bars, also known as black bars, are a basic form of text, photography, and video censorship in which "sensitive" information or images are occluded by black, gray, or white rectangular boxes. These bars have been used to censor various parts of images.
The text editor could replace this byte with the replacement character to produce a valid string of Unicode code points for display, so the user sees "f r". A poorly implemented text editor might write out the replacement character when the user saves the file; the data in the file will then become 0x66 0xEF 0xBF 0xBD 0x72.
The novel starts with a collapse of electrical grids across Europe, plunging the population into darkness and disaster. [2] [3] The prolonged electricity cut causes major problems: no more petrol, no telephone, no food in supermarkets, no cash machines working, nuclear disasters, etc. [3] [4] A former computer hacker and IT professional tries to find out the root cause for this.
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