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2. PAdES - Wikipedia

   en.wikipedia.org/wiki/PAdES

   PAdES has 4 levels of verification for digital certificate, from the most simple and basic (b-b, indicating a signature was executed with a certificate that was valid on a date) to the most complex (b-LTV) allowing electronically signed documents to remain valid for long periods (long term validity) even if underlying cryptographic algorithms ...

3. Certificate Transparency - Wikipedia

   en.wikipedia.org/wiki/Certificate_Transparency

   Certificates that support certificate transparency must include one or more signed certificate timestamps (SCTs), which is a promise from a log operator to include the certificate in their log within a maximum merge delay (MMD). [4] [3] At some point within the maximum merge delay, the log operator adds the certificate to their log.

4. 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.

5. Search, sort, and manage files with the Download Manager in ...

   help.aol.com/articles/search-sort-and-manage...

   The AOL Desktop Gold Download Manager allows you to access a list of your downloaded files in one convenient location. Use the Download Manager to access and search downloads, sort downloads, web search similar items, and more. Open the Download Manager to access a download

6. PDF - Wikipedia

   en.wikipedia.org/wiki/PDF

   A PDF page description can use a matrix to scale, rotate, or skew graphical elements. A key concept in PDF is that of the graphics state, which is a collection of graphical parameters that may be changed, saved, and restored by a page description. PDF has (as of version 2.0) 25 graphics state properties, of which some of the most important are:

7. Digital signature - Wikipedia

   en.wikipedia.org/wiki/Digital_signature

   Digital signatures cryptographically bind an electronic identity to an electronic document and the digital signature cannot be copied to another document. Paper contracts sometimes have the ink signature block on the last page, and the previous pages may be replaced after a signature is applied.