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What is PDF? Portable Document Format is a file format created by Adobe Systems in year 1993. This was created for the purpose of document exchange. PDF represents two dimensional in such a manner which is independent or free from any specific application, hardware, operation etc. One can encrypt a PDF file for security reasons. The standard security provided in PDF is “user password” and “owner password”. Through this, editing and printing of the document can be restricted. One can also restrict “Copy” command on PDF file or document. There are numerous E books made on PDF files because there is no threat for it to be edited straight away.

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