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2. List of PDF software - Wikipedia

   en.wikipedia.org/wiki/List_of_PDF_software

   Extraction and analysis tool, handles corrupt and malicious PDF documents. PDFedit: GNU GPL: Yes Yes BSD Yes Software to view or edit the internal structures of PDF documents, and merge them. Pdftk: GNU GPL: Yes Yes Yes FreeBSD, Solaris Yes Command-line tools to edit and convert documents; supports filling of PDF forms with FDF/XFDF data.

3. Digital signature - Wikipedia

   en.wikipedia.org/wiki/Digital_signature

   The first widely marketed software package to offer digital signature was Lotus Notes 1.0, released in 1989, which used the RSA algorithm. [26] Other digital signature schemes were soon developed after RSA, the earliest being Lamport signatures, [27] Merkle signatures (also known as "Merkle trees" or simply "Hash trees"), [28] and Rabin ...

4. Message authentication code - Wikipedia

   en.wikipedia.org/wiki/Message_authentication_code

   Thus, digital signatures do offer non-repudiation. However, non-repudiation can be provided by systems that securely bind key usage information to the MAC key; the same key is in the possession of two people, but one has a copy of the key that can be used for MAC generation while the other has a copy of the key in a hardware security module ...

5. PAdES - Wikipedia

   en.wikipedia.org/wiki/PAdES

   The EU recognizes three different eIDAS-compliant implementations of advanced electronic signatures through digital signatures: PAdES, XAdES and CAdES. [7] An electronic signature can carry legal effect and be used as evidence in legal proceedings. A qualified electronic signature shall have the equivalent legal effect of a handwritten signature.

6. CC PDF Converter - Wikipedia

   en.wikipedia.org/wiki/CC_PDF_Converter

   CC PDF Converter was a free and open-source program that allowed users to convert documents into PDF files on Microsoft Windows operating systems, while embedding a Creative Commons license. [1] [2] The application leveraged RedMon and Ghostscript and was licensed under the GNU GPL. A 2013 review in PC World gave the software 4 out of 5 stars. [2]

7. PKCS 7 - Wikipedia

   en.wikipedia.org/wiki/PKCS_7

   .p7r – response to CSR. Contains the newly-signed certificate, and the CA's own cert..p7s - Digital Signature. May contain the original signed file or message. Used in S/MIME for email signing.