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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. List of PDF software - Wikipedia

   en.wikipedia.org/wiki/List_of_PDF_software

   This is a list of links to articles on software used to manage Portable Document Format (PDF) documents. The distinction between the various functions is not entirely clear-cut; for example, some viewers allow adding of annotations, signatures, etc. Some software allows redaction, removing content irreversibly for security.

4. Electronic signature - Wikipedia

   en.wikipedia.org/wiki/Electronic_signature

   An electronic signature, or e-signature, is data that is logically associated with other data and which is used by the signatory to sign the associated data. [1] [2] [3] This type of signature has the same legal standing as a handwritten signature as long as it adheres to the requirements of the specific regulation under which it was created (e.g., eIDAS in the European Union, NIST-DSS in the ...

5. Category:Free PDF software - Wikipedia

   en.wikipedia.org/wiki/Category:Free_PDF_software

   Category. : Free PDF software. This is a category of articles relating to free software for making or viewing Portable Document Format (PDF) documents. That is, software which can be freely used, copied, studied, modified, and redistributed by everyone that obtains a copy. Typically, this means software which is distributed with a free software ...

6. PDF Split and Merge - Wikipedia

   en.wikipedia.org/wiki/PDF_Split_and_Merge

   Website. pdfsam.org. PDFsam Basic or PDF Split and Merge is a free and open-source cross-platform desktop application to split, merge, extract pages, rotate and mix PDF documents. PDFsam uses a freemium model and encourages buying the full version with popups.

7. List of file signatures - Wikipedia

   en.wikipedia.org/wiki/List_of_file_signatures

   List of file signatures. This is a list of file signatures, data used to identify or verify the content of a file. Such signatures are also known as magic numbers or Magic Bytes. Many file formats are not intended to be read as text. If such a file is accidentally viewed as a text file, its contents will be unintelligible.