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  2. PDF - Wikipedia

    en.wikipedia.org/wiki/PDF

    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. PDF files may be digitally signed, to provide secure authentication; complete details on implementing digital signatures in PDF are provided in ISO 32000-2.

  3. Adobe Acrobat - Wikipedia

    en.wikipedia.org/wiki/Adobe_Acrobat

    Acrobat Reader Touch is a free PDF document viewer developed and released on December 11, 2012, by Adobe Systems for the Windows Touch user interface. FormsCentral was a web form filling server for users with Windows, macOS, or a web browser and an Adobe ID only.

  4. iText - Wikipedia

    en.wikipedia.org/wiki/IText

    iText is a library for creating and manipulating PDF files in Java and . NET.It was created in 2000 and written by Bruno Lowagie. The source code was initially distributed as open source under the Mozilla Public License or the GNU Library General Public License open source licenses.

  5. List of PDF software - Wikipedia

    en.wikipedia.org/wiki/List_of_PDF_software

    deskUNPDF: PDF converter to convert PDFs to Word (.doc, docx), Excel (.xls), (.csv), (.txt), more; GSview: File:Convert menu item converts any sequence of PDF pages to a sequence of images in many formats from bit to tiffpack with resolutions from 72 to 204 × 98 (open source software) Google Chrome: convert HTML to PDF using Print > Save as PDF.

  6. List of primary education systems by country - Wikipedia

    en.wikipedia.org/wiki/List_of_primary_education...

    At some places, primary education is labeled as the education of Class 3rd to Class 5th and up to class 2nd as pre-primary education. This is because many new concepts are introduced in this class. Children are taught painting instead of drawing and colouring, exams are taken, and Word Sum Puzzle in maths are introduced along with geometry.

  7. Scientific notation - Wikipedia

    en.wikipedia.org/wiki/Scientific_notation

    Any real number can be written in the form m × 10 ^ n in many ways: for example, 350 can be written as 3.5 × 10 2 or 35 × 10 1 or 350 × 10 0. In normalized scientific notation (called "standard form" in the United Kingdom), the exponent n is chosen so that the absolute value of m remains at least one but less than ten ( 1 ≤ | m | < 10 ).

  8. Orders of magnitude (length) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(length)

    10 Mm – approximate altitude of the outer boundary of the exosphere; 10.001 Mm – length of the meridian arc from the North Pole to the Equator (the original definition of the meter was based on this length) 40.000 Mm – length of the Ring of Fire; 60.000 Mm – total length of the mid-ocean ridges

  9. Reading - Wikipedia

    en.wikipedia.org/wiki/Reading

    Reading is the process of taking in the sense or meaning of symbols, often specifically those of a written language, by means of sight or touch. [1] [2] [3] [4]For educators and researchers, reading is a multifaceted process involving such areas as word recognition, orthography (spelling), alphabetics, phonics, phonemic awareness, vocabulary, comprehension, fluency, and motivation.