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  2. PDF - Wikipedia

    en.wikipedia.org/wiki/PDF

    Beginning with PDF 1.5, Usage rights (UR) signatures are used to enable additional interactive features that are not available by default in a particular PDF viewer application. The signature is used to validate that the permissions have been granted by a bona fide granting authority. For example, it can be used to allow a user: [37] To save ...

  3. Digital signature - Wikipedia

    en.wikipedia.org/wiki/Digital_signature

    A digital signature is a mathematical scheme for verifying the authenticity of digital messages or documents. A valid digital signature on a message gives a recipient confidence that the message came from a sender known to the recipient. [1] [2]

  4. 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 ...

  5. Undeniable signature - Wikipedia

    en.wikipedia.org/wiki/Undeniable_signature

    An undeniable signature is a digital signature scheme which allows the signer to be selective to whom they allow to verify signatures. The scheme adds explicit signature repudiation, preventing a signer later refusing to verify a signature by omission; a situation that would devalue the signature in the eyes of the verifier.

  6. 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 ...

  7. Fix problems sending AOL Mail - AOL Help

    help.aol.com/articles/aol-mail-troubleshooting

    If you're having problems sending mail, there are a few troubleshooting steps you can take to fix the problem. Restart your computer:. If you haven't shut down your computer in a while, we recommend that you begin troubleshooting by restarting your computer.

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