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2. 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.

3. Best Free PDF Editors of 2023 - AOL

   www.aol.com/finance/best-free-pdf-editors-2023...

   Completely free PDF editing with no download required. Cons. May need Canva Pro to access certain images or design features. Best Freemium App: iLovePDF. ILovePDF is one of the most popular apps ...

4. 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.

5. 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.

6. File:Ilovepdf.svg - Wikipedia

   en.wikipedia.org/wiki/File:Ilovepdf.svg

   File:Ilovepdf.svg. Size of this PNG preview of this SVG file: 85 × 75 pixels. Other resolutions: 272 × 240 pixels | 544 × 480 pixels | 870 × 768 pixels | 1,161 × 1,024 pixels | 2,321 × 2,048 pixels. This is a file from the Wikimedia Commons. Information from its description page there is shown below.

7. PAdES - Wikipedia

   en.wikipedia.org/wiki/PAdES

   PAdES. PAdES (PDF Advanced Electronic Signatures) is a set of restrictions and extensions to PDF and ISO 32000-1 [1] making it suitable for advanced electronic signatures (AdES). This is published by ETSI as EN 319 142. [2]